Examples of org.datanucleus.store.rdbms.sql.SQLStatement

org.datanucleus.store.rdbms.sql.SQLStatement
Class providing an API for generating SQL statements. Caller should create the SQLStatement object and (optionally) call setClassLoaderResolver() to set any class loading restriction. Then the caller builds up the statement using the various methods, and accesses the SQL statement using getStatement(). Generated statement is of the form :-
```
 SELECT {expr}, {expr}, ... FROM {tblExpr} [joinInfo {tblExpr} ON ...] ... WHERE {boolExpr} [AND|OR] {boolExpr} ... GROUP BY {expr}, {expr} HAVING {boolExpr} ORDER BY {expr} [ASC|DESC], {expr} [ASC|DESC], ... 
```
and also supports UNIONs between SQLStatements, and having sub-queries of other SQLStatements. Alternatively, for an UPDATE,
```
 UPDATE {tbl} SET {expr}={val}, {expr}={val}, ... WHERE {boolExpr} [AND|OR] {boolExpr} ... 
```
The generated SQL is cached. Any use of a mutating method, changing the composition of the statement will clear the cached SQL, and it will be regenerated when
```
getStatement
```
is called next.
Table Groups
When tables are registered in the statement they are split into "table groups". A table group is, in simple terms, an object in the query. If a table has a super-table and a field of the object is selected that is in the super-table then the super-table is added to the table group. If there is a join to a related object then the table of this object will be put in a new table group. So the same datastore table can appear multiple times in the statement, each time for a different object.
Table Aliases
All methods that cause a new SQLTable to be created also allow specification of the table alias in the statement. Where the alias is not provided then we use a table "namer" (definable on the plugin-point "org.datanucleus.store.rdbms.sql_tablenamer"). The table namer can define names simply based on the table number, or based on table group and the number of tables in the group etc etc. To select a particular table "namer", set the extension "datanucleus.sqlTableNamingStrategy" to the key of the namer plugin. The default is "alpha-scheme" which bases table names on the group and number in that group.

        RDBMSStoreManager storeMgr = (RDBMSStoreManager)ec.getStoreManager();
        DatastoreClass classTable = (DatastoreClass)datastoreContainer; // Don't support join tables yet
        SQLExpressionFactory exprFactory = storeMgr.getSQLExpressionFactory();


        // Generate "SELECT {clobColumn} FROM TABLE WHERE ID=? FOR UPDATE" statement
        SQLStatement sqlStmt = new SQLStatement(storeMgr, datastoreContainer, null, null);
        sqlStmt.setClassLoaderResolver(ec.getClassLoaderResolver());
        sqlStmt.addExtension("lock-for-update", true);
        SQLTable blobSqlTbl = SQLStatementHelper.getSQLTableForMappingOfTable(sqlStmt, sqlStmt.getPrimaryTable(), mapping.getJavaTypeMapping());
        sqlStmt.select(blobSqlTbl, mapping.getDatastoreField(), null);
        StatementClassMapping mappingDefinition = new StatementClassMapping();
        AbstractClassMetaData cmd = sm.getClassMetaData();
        int inputParamNum = 1;
        if (cmd.getIdentityType() == IdentityType.DATASTORE)
        {
            // Datastore identity value for input
            JavaTypeMapping datastoreIdMapping = classTable.getDatastoreObjectIdMapping();
            SQLExpression expr = exprFactory.newExpression(sqlStmt, sqlStmt.getPrimaryTable(), 
                datastoreIdMapping);
            SQLExpression val = exprFactory.newLiteralParameter(sqlStmt, datastoreIdMapping, null, "ID");
            sqlStmt.whereAnd(expr.eq(val), true);


            StatementMappingIndex datastoreIdx = mappingDefinition.getMappingForMemberPosition(StatementClassMapping.MEMBER_DATASTORE_ID);
            if (datastoreIdx == null)
            {
                datastoreIdx = new StatementMappingIndex(datastoreIdMapping);
                mappingDefinition.addMappingForMember(StatementClassMapping.MEMBER_DATASTORE_ID, datastoreIdx);
            }
            datastoreIdx.addParameterOccurrence(new int[] {inputParamNum});
        }
        else if (cmd.getIdentityType() == IdentityType.APPLICATION)
        {
            // Application identity value(s) for input
            int[] pkNums = cmd.getPKMemberPositions();
            for (int i=0;i<pkNums.length;i++)
            {
                AbstractMemberMetaData mmd = cmd.getMetaDataForManagedMemberAtAbsolutePosition(pkNums[i]);
                JavaTypeMapping pkMapping = classTable.getMemberMapping(mmd);
                SQLExpression expr = exprFactory.newExpression(sqlStmt, sqlStmt.getPrimaryTable(),
                    pkMapping);
                SQLExpression val = exprFactory.newLiteralParameter(sqlStmt, pkMapping, null, "PK" + i);
                sqlStmt.whereAnd(expr.eq(val), true);


                StatementMappingIndex pkIdx = mappingDefinition.getMappingForMemberPosition(pkNums[i]);
                if (pkIdx == null)
                {
                    pkIdx = new StatementMappingIndex(pkMapping);
                    mappingDefinition.addMappingForMember(pkNums[i], pkIdx);
                }
                int[] inputParams = new int[pkMapping.getNumberOfDatastoreMappings()];
                for (int j=0;j<pkMapping.getNumberOfDatastoreMappings();j++)
                {
                    inputParams[j] = inputParamNum++;
                }
                pkIdx.addParameterOccurrence(inputParams);
            }
        }


        String textStmt = sqlStmt.getSelectStatement().toSQL();


        if (sm.isEmbedded())
        {
            // This mapping is embedded, so navigate back to the real owner since that is the "id" in the table
            ObjectProvider[] embeddedOwners = sm.getEmbeddedOwners();

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        RDBMSStoreManager storeMgr = (RDBMSStoreManager)ec.getStoreManager();
        DatastoreClass classTable = (DatastoreClass)datastoreContainer; // Don't support join tables yet
        SQLExpressionFactory exprFactory = storeMgr.getSQLExpressionFactory();


        // Generate "SELECT {blobColumn} FROM TABLE WHERE ID=? FOR UPDATE" statement
        SQLStatement sqlStmt = new SQLStatement(storeMgr, datastoreContainer, null, null);
        sqlStmt.setClassLoaderResolver(ec.getClassLoaderResolver());
        sqlStmt.addExtension("lock-for-update", true);
        SQLTable blobSqlTbl = SQLStatementHelper.getSQLTableForMappingOfTable(sqlStmt, sqlStmt.getPrimaryTable(), mapping.getJavaTypeMapping());
        sqlStmt.select(blobSqlTbl, mapping.getDatastoreField(), null);
        StatementClassMapping mappingDefinition = new StatementClassMapping();
        AbstractClassMetaData cmd = sm.getClassMetaData();
        int inputParamNum = 1;
        if (cmd.getIdentityType() == IdentityType.DATASTORE)
        {
            // Datastore identity value for input
            JavaTypeMapping datastoreIdMapping = classTable.getDatastoreObjectIdMapping();
            SQLExpression expr = exprFactory.newExpression(sqlStmt, sqlStmt.getPrimaryTable(), 
                datastoreIdMapping);
            SQLExpression val = exprFactory.newLiteralParameter(sqlStmt, datastoreIdMapping, null, "ID");
            sqlStmt.whereAnd(expr.eq(val), true);


            StatementMappingIndex datastoreIdx = mappingDefinition.getMappingForMemberPosition(StatementClassMapping.MEMBER_DATASTORE_ID);
            if (datastoreIdx == null)
            {
                datastoreIdx = new StatementMappingIndex(datastoreIdMapping);
                mappingDefinition.addMappingForMember(StatementClassMapping.MEMBER_DATASTORE_ID, datastoreIdx);
            }
            datastoreIdx.addParameterOccurrence(new int[] {inputParamNum});
        }
        else if (cmd.getIdentityType() == IdentityType.APPLICATION)
        {
            // Application identity value(s) for input
            int[] pkNums = cmd.getPKMemberPositions();
            for (int i=0;i<pkNums.length;i++)
            {
                AbstractMemberMetaData mmd = cmd.getMetaDataForManagedMemberAtAbsolutePosition(pkNums[i]);
                JavaTypeMapping pkMapping = classTable.getMemberMapping(mmd);
                SQLExpression expr = exprFactory.newExpression(sqlStmt, sqlStmt.getPrimaryTable(),
                    pkMapping);
                SQLExpression val = exprFactory.newLiteralParameter(sqlStmt, pkMapping, null, "PK" + i);
                sqlStmt.whereAnd(expr.eq(val), true);


                StatementMappingIndex pkIdx = mappingDefinition.getMappingForMemberPosition(pkNums[i]);
                if (pkIdx == null)
                {
                    pkIdx = new StatementMappingIndex(pkMapping);
                    mappingDefinition.addMappingForMember(pkNums[i], pkIdx);
                }
                int[] inputParams = new int[pkMapping.getNumberOfDatastoreMappings()];
                for (int j=0;j<pkMapping.getNumberOfDatastoreMappings();j++)
                {
                    inputParams[j] = inputParamNum++;
                }
                pkIdx.addParameterOccurrence(inputParams);
            }
        }


        String textStmt = sqlStmt.getSelectStatement().toSQL();


        if (sm.isEmbedded())
        {
            // This mapping is embedded, so navigate back to the real owner since that is the "id" in the table
            ObjectProvider[] embeddedOwners = sm.getEmbeddedOwners();

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        if (iteratorStmtLocked == null)
        {
            synchronized (this) // Make sure this completes in case another thread needs the same info
            {
                // Generate the statement, and statement mapping/parameter information
                SQLStatement sqlStmt = getSQLStatementForIterator(ownerSM);
                iteratorStmtUnlocked = sqlStmt.getSelectStatement().toSQL();
                sqlStmt.addExtension("lock-for-update", true);
                iteratorStmtLocked = sqlStmt.getSelectStatement().toSQL();
            }
        }


        Transaction tx = ec.getTransaction();
        String stmt = (tx.lockReadObjects() ? iteratorStmtLocked : iteratorStmtUnlocked);

View Full Code Here

     * @param ownerSM StateManager for the owner object
     * @return The SQLStatement
     */
    protected SQLStatement getSQLStatementForIterator(ObjectProvider ownerSM)
    {
        SQLStatement sqlStmt = null;


        final ClassLoaderResolver clr = ownerSM.getExecutionContext().getClassLoaderResolver();
        final Class valueCls = clr.classForName(elementType);
        RDBMSStoreManager storeMgr = (RDBMSStoreManager)this.storeMgr;
        SQLTable containerSqlTbl = null;
        MapType mapType = getOwnerMemberMetaData().getMap().getMapType();
        if (emd != null && emd.getDiscriminatorStrategyForTable() != null &&
            emd.getDiscriminatorStrategyForTable() != DiscriminatorStrategy.NONE)
        {
            // Map<?, PC> where value has discriminator
            if (ClassUtils.isReferenceType(valueCls))
            {
                // Take the metadata for the first implementation of the reference type
                String[] clsNames = storeMgr.getNucleusContext().getMetaDataManager().getClassesImplementingInterface(elementType, clr);
                Class[] cls = new Class[clsNames.length];
                for (int j=0; j<clsNames.length; j++)
                {
                    cls[j] = clr.classForName(clsNames[j]);
                }
                StatementGenerator stmtGen = new DiscriminatorStatementGenerator(storeMgr, clr, cls, true, null, null);
                sqlStmt = stmtGen.getStatement();
            }
            else
            {
                StatementGenerator stmtGen = new DiscriminatorStatementGenerator(storeMgr, clr, valueCls, true, null, null);
                sqlStmt = stmtGen.getStatement();
            }
            iterateUsingDiscriminator = true;


            if (mapType == MapType.MAP_TYPE_VALUE_IN_KEY)
            {
                // Join to key table and select value fields
                JavaTypeMapping valueIdMapping = sqlStmt.getPrimaryTable().getTable().getIdMapping();
                containerSqlTbl = sqlStmt.innerJoin(sqlStmt.getPrimaryTable(), valueIdMapping,
                    containerTable, null, elementMapping, null, null);


                iteratorMappingDef = new StatementClassMapping();
                SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(sqlStmt, iteratorMappingDef,
                    ownerSM.getExecutionContext().getFetchPlan(), sqlStmt.getPrimaryTable(), emd, 0);
            }
            else if (mapType == MapType.MAP_TYPE_KEY_IN_VALUE)
            {
                // Select value fields
                containerSqlTbl = sqlStmt.getPrimaryTable();


                iteratorMappingDef = new StatementClassMapping();
                SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(sqlStmt, iteratorMappingDef,
                    ownerSM.getExecutionContext().getFetchPlan(), sqlStmt.getPrimaryTable(), emd, 0);
            }
            else
            {
                // Join to join table and select value fields
                JavaTypeMapping valueIdMapping = sqlStmt.getPrimaryTable().getTable().getIdMapping();
                containerSqlTbl = sqlStmt.innerJoin(sqlStmt.getPrimaryTable(), valueIdMapping,
                    containerTable, null, elementMapping, null, null);


                iteratorMappingDef = new StatementClassMapping();
                SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(sqlStmt, iteratorMappingDef,
                    ownerSM.getExecutionContext().getFetchPlan(), sqlStmt.getPrimaryTable(), emd, 0);
            }
        }
        else
        {
            if (mapType == MapType.MAP_TYPE_VALUE_IN_KEY)
            {
                if (emd != null)
                {
                    // TODO Allow for null value [change to select the key table and left outer join to the key]
                    // Select of value table, joining to key table
                    iteratorMappingDef = new StatementClassMapping();
                    UnionStatementGenerator stmtGen = new UnionStatementGenerator(storeMgr, clr, valueCls, true, null, null);
                    stmtGen.setOption(StatementGenerator.OPTION_SELECT_NUCLEUS_TYPE);
                    iteratorMappingDef.setNucleusTypeColumnName(UnionStatementGenerator.NUC_TYPE_COLUMN);
                    sqlStmt = stmtGen.getStatement();


                    JavaTypeMapping valueIdMapping = sqlStmt.getPrimaryTable().getTable().getIdMapping();
                    containerSqlTbl = sqlStmt.innerJoin(sqlStmt.getPrimaryTable(), valueIdMapping,
                        containerTable, null, elementMapping, null, null);


                    SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(sqlStmt, iteratorMappingDef,
                        ownerSM.getExecutionContext().getFetchPlan(), sqlStmt.getPrimaryTable(), emd, 0);
                }
                else
                {
                    // Select of value in key table
                    sqlStmt = new SQLStatement(storeMgr, containerTable, null, null);
                    sqlStmt.setClassLoaderResolver(clr);
                    containerSqlTbl = sqlStmt.getPrimaryTable();
                    sqlStmt.select(sqlStmt.getPrimaryTable(), elementMapping, null);
                }
            }
            else if (mapType == MapType.MAP_TYPE_KEY_IN_VALUE)
            {
                // Select of value in value table (allow union of possible value types)
                iteratorMappingDef = new StatementClassMapping();
                UnionStatementGenerator stmtGen = new UnionStatementGenerator(storeMgr, clr, valueCls, true, null, null);
                stmtGen.setOption(StatementGenerator.OPTION_SELECT_NUCLEUS_TYPE);
                iteratorMappingDef.setNucleusTypeColumnName(UnionStatementGenerator.NUC_TYPE_COLUMN);
                sqlStmt = stmtGen.getStatement();
                containerSqlTbl = sqlStmt.getPrimaryTable();


                SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(sqlStmt, iteratorMappingDef,
                    ownerSM.getExecutionContext().getFetchPlan(), sqlStmt.getPrimaryTable(), emd, 0);
            }
            else
            {
                if (emd != null)
                {
                    // TODO Allow for null value [change to select the join table and left outer join to the key]
                    // Select of value table, joining to key table
                    iteratorMappingDef = new StatementClassMapping();
                    UnionStatementGenerator stmtGen = new UnionStatementGenerator(storeMgr, clr, valueCls, true, null, null);
                    stmtGen.setOption(StatementGenerator.OPTION_SELECT_NUCLEUS_TYPE);
                    iteratorMappingDef.setNucleusTypeColumnName(UnionStatementGenerator.NUC_TYPE_COLUMN);
                    sqlStmt = stmtGen.getStatement();


                    JavaTypeMapping valueIdMapping = sqlStmt.getPrimaryTable().getTable().getIdMapping();
                    containerSqlTbl = sqlStmt.innerJoin(sqlStmt.getPrimaryTable(), valueIdMapping,
                        containerTable, null, elementMapping, null, null);


                    SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(sqlStmt, iteratorMappingDef,
                        ownerSM.getExecutionContext().getFetchPlan(), sqlStmt.getPrimaryTable(), emd, 0);
                }
                else
                {
                    // Select of value in join table
                    sqlStmt = new SQLStatement(storeMgr, containerTable, null, null);
                    containerSqlTbl = sqlStmt.getPrimaryTable();
                    sqlStmt.select(sqlStmt.getPrimaryTable(), elementMapping, null);
                }
            }
        }


        // Apply condition on owner field to filter by owner
        SQLExpressionFactory exprFactory = storeMgr.getSQLExpressionFactory();
        SQLTable ownerSqlTbl =
            SQLStatementHelper.getSQLTableForMappingOfTable(sqlStmt, containerSqlTbl, ownerMapping);
        SQLExpression ownerExpr = exprFactory.newExpression(sqlStmt, ownerSqlTbl, ownerMapping);
        SQLExpression ownerVal = exprFactory.newLiteralParameter(sqlStmt, ownerMapping, null, "OWNER");
        sqlStmt.whereAnd(ownerExpr.eq(ownerVal), true);


        // Input parameter(s) - the owner
        int inputParamNum = 1;
        StatementMappingIndex ownerIdx = new StatementMappingIndex(ownerMapping);
        if (sqlStmt.getNumberOfUnions() > 0)
        {
            // Add parameter occurrence for each union of statement
            for (int j=0;j<sqlStmt.getNumberOfUnions()+1;j++)
            {
                int[] paramPositions = new int[ownerMapping.getNumberOfDatastoreMappings()];
                for (int k=0;k<ownerMapping.getNumberOfDatastoreMappings();k++)
                {
                    paramPositions[k] = inputParamNum++;

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     */
    public static SQLStatement getStatementForCandidates(SQLStatement parentStmt, AbstractClassMetaData cmd, 
            StatementClassMapping clsMapping, ExecutionContext ec, Class candidateCls, boolean subclasses, 
            String result, String candidateAlias, String candidateTableGroupName)
    {
        SQLStatement stmt = null;


        RDBMSStoreManager storeMgr = (RDBMSStoreManager)ec.getStoreManager();
        DatastoreIdentifier candidateAliasId = null;
        if (candidateAlias != null)
        {
            candidateAliasId = storeMgr.getIdentifierFactory().newDatastoreContainerIdentifier(candidateAlias);
        }


        ClassLoaderResolver clr = ec.getClassLoaderResolver();
        List<DatastoreClass> candidateTables = new ArrayList<DatastoreClass>();
        if (cmd.getInheritanceMetaData().getStrategy() == InheritanceStrategy.COMPLETE_TABLE)
        {
            DatastoreClass candidateTable = storeMgr.getDatastoreClass(cmd.getFullClassName(), clr);
            if (candidateTable != null)
            {
                candidateTables.add(candidateTable);
            }
            if (subclasses)
            {
                Set<String> subclassNames = 
                    storeMgr.getSubClassesForClass(cmd.getFullClassName(), subclasses, clr);
                if (subclassNames != null)
                {
                    Iterator<String> subclassIter = subclassNames.iterator();
                    while (subclassIter.hasNext())
                    {
                        String subclassName = subclassIter.next();
                        DatastoreClass tbl = storeMgr.getDatastoreClass(subclassName, clr);
                        if (tbl != null)
                        {
                            candidateTables.add(tbl);
                        }
                    }
                }
            }


            Iterator<DatastoreClass> iter = candidateTables.iterator();
            int maxClassNameLength = cmd.getFullClassName().length();
            while (iter.hasNext())
            {
                DatastoreClass cls = iter.next();
                String className = cls.getType();
                if (className.length() > maxClassNameLength)
                {
                    maxClassNameLength = className.length();
                }
            }


            iter = candidateTables.iterator();
            while (iter.hasNext())
            {
                DatastoreClass cls = iter.next();


                SQLStatement tblStmt =
                    new SQLStatement(parentStmt, storeMgr, cls, candidateAliasId, candidateTableGroupName);
                tblStmt.setClassLoaderResolver(clr);
                tblStmt.setCandidateClassName(cls.getType());


                // Add SELECT of dummy column accessible as "NUCLEUS_TYPE" containing the classname
                JavaTypeMapping m = storeMgr.getMappingManager().getMapping(String.class);
                String nuctypeName = cls.getType();
                if (maxClassNameLength > nuctypeName.length())
                {
                    nuctypeName = StringUtils.leftAlignedPaddedString(nuctypeName, maxClassNameLength);
                }
                StringLiteral lit = new StringLiteral(tblStmt, m, nuctypeName, null);
                tblStmt.select(lit, UnionStatementGenerator.NUC_TYPE_COLUMN);


                if (stmt == null)
                {
                    stmt = tblStmt;
                }
                else
                {
                    stmt.union(tblStmt);
                }
            }
            if (clsMapping != null)
            {
                clsMapping.setNucleusTypeColumnName(UnionStatementGenerator.NUC_TYPE_COLUMN);
            }
        }
        else
        {
            // "new-table", "superclass-table", "subclass-table"
            List<Class> candidateClasses = new ArrayList<Class>();
            if (ClassUtils.isReferenceType(candidateCls))
            {
                // Persistent interface, so find all persistent implementations
                String[] clsNames =
                    storeMgr.getNucleusContext().getMetaDataManager().getClassesImplementingInterface(candidateCls.getName(), clr);
                for (int i=0;i<clsNames.length;i++)
                {
                    Class cls = clr.classForName(clsNames[i]);
                    DatastoreClass table = storeMgr.getDatastoreClass(clsNames[i], clr);
                    candidateClasses.add(cls);
                    candidateTables.add(table);
                    AbstractClassMetaData implCmd = storeMgr.getNucleusContext().getMetaDataManager().getMetaDataForClass(cls, clr);
                    if (implCmd.getIdentityType() != cmd.getIdentityType())
                    {
                        throw new NucleusUserException("You are querying an interface (" + cmd.getFullClassName() + ") " +
                            "yet one of its implementations (" + implCmd.getFullClassName() + ") " +
                            " uses a different identity type!");
                    }
                    else if (cmd.getIdentityType() == IdentityType.APPLICATION)
                    {
                        if (cmd.getPKMemberPositions().length != implCmd.getPKMemberPositions().length)
                        {
                            throw new NucleusUserException("You are querying an interface (" + cmd.getFullClassName() + ") " +
                                "yet one of its implementations (" + implCmd.getFullClassName() + ") " +
                                " has a different number of PK members!");
                        }
                    }
                }
            }
            else
            {
                DatastoreClass candidateTable = storeMgr.getDatastoreClass(cmd.getFullClassName(), clr);
                if (candidateTable != null)
                {
                    // Candidate has own table
                    candidateClasses.add(candidateCls);
                    candidateTables.add(candidateTable);
                }
                else
                {
                    // Candidate stored in subclass tables
                    AbstractClassMetaData[] cmds = storeMgr.getClassesManagingTableForClass(cmd, clr);
                    if (cmds != null && cmds.length > 0)
                    {
                        for (int i=0;i<cmds.length;i++)
                        {
                            DatastoreClass table = storeMgr.getDatastoreClass(cmds[i].getFullClassName(), clr);
                            Class cls = clr.classForName(cmds[i].getFullClassName());
                            candidateClasses.add(cls);
                            candidateTables.add(table);
                        }
                    }
                    else
                    {
                        throw new UnsupportedOperationException("No tables for query of " + cmd.getFullClassName());
                    }
                }
            }


            for (int i=0;i<candidateTables.size();i++)
            {
                DatastoreClass tbl = candidateTables.get(i);
                Class cls = candidateClasses.get(i);
                StatementGenerator stmtGen = null;
                if (tbl.getDiscriminatorMapping(true) != null || QueryUtils.resultHasOnlyAggregates(result))
                {
                    // Either has a discriminator, or only selecting aggregates so need single select
                    stmtGen = new DiscriminatorStatementGenerator(storeMgr, clr, cls, subclasses, 
                        candidateAliasId, candidateTableGroupName);
                    stmtGen.setOption(StatementGenerator.OPTION_RESTRICT_DISCRIM);
                }
                else
                {
                    stmtGen = new UnionStatementGenerator(storeMgr, clr, cls, subclasses, 
                        candidateAliasId, candidateTableGroupName);
                    if (result == null)
                    {
                        // Returning one row per candidate so include distinguisher column
                        stmtGen.setOption(StatementGenerator.OPTION_SELECT_NUCLEUS_TYPE);
                        clsMapping.setNucleusTypeColumnName(UnionStatementGenerator.NUC_TYPE_COLUMN);
                    }
                }
                stmtGen.setParentStatement(parentStmt);
                SQLStatement tblStmt = stmtGen.getStatement();


                if (stmt == null)
                {
                    stmt = tblStmt;
                }

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        if (iteratorStmtLocked == null)
        {
            synchronized (this) // Make sure this completes in case another thread needs the same info
            {
                // Generate the statement, and statement mapping/parameter information
                SQLStatement sqlStmt = getSQLStatementForIterator(ownerSM);
                iteratorStmtUnlocked = sqlStmt.getSelectStatement().toSQL();
                sqlStmt.addExtension("lock-for-update", true);
                iteratorStmtLocked = sqlStmt.getSelectStatement().toSQL();
            }
        }


        Transaction tx = ec.getTransaction();
        String stmt = (tx.lockReadObjects() ? iteratorStmtLocked : iteratorStmtUnlocked);

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        if (elementInfo == null || elementInfo.length == 0)
        {
            return null;
        }


        SQLStatement sqlStmt = null;


        RDBMSStoreManager storeMgr = (RDBMSStoreManager)this.storeMgr;
        SQLExpressionFactory exprFactory = storeMgr.getSQLExpressionFactory();
        final ClassLoaderResolver clr = ownerSM.getExecutionContext().getClassLoaderResolver();
        iteratorMappingDef = new StatementClassMapping();
        if (elementInfo[0].getDatastoreClass().getDiscriminatorMetaData() != null &&
            elementInfo[0].getDatastoreClass().getDiscriminatorMetaData().getStrategy() != DiscriminatorStrategy.NONE)
        {
            // TODO Only caters for one elementInfo, but with subclass-table we can have multiple
            String elementType = ownerMemberMetaData.getCollection().getElementType();
            if (ClassUtils.isReferenceType(clr.classForName(elementType)))
            {
                String[] clsNames =
                    storeMgr.getNucleusContext().getMetaDataManager().getClassesImplementingInterface(elementType, clr);
                Class[] cls = new Class[clsNames.length];
                for (int i=0; i<clsNames.length; i++)
                {
                    cls[i] = clr.classForName(clsNames[i]);
                }
                sqlStmt = new DiscriminatorStatementGenerator(storeMgr, clr, cls, true, null, null).getStatement();
            }
            else
            {
                sqlStmt = new DiscriminatorStatementGenerator(storeMgr, clr,
                    clr.classForName(elementInfo[0].getClassName()), true, null, null).getStatement();
            }
            iterateUsingDiscriminator = true;


            // Select the required fields (of the element class)
            SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(sqlStmt, iteratorMappingDef,
                ownerSM.getExecutionContext().getFetchPlan(), sqlStmt.getPrimaryTable(), emd, 0);
        }
        else
        {
            for (int i=0;i<elementInfo.length;i++)
            {
                final Class elementCls = clr.classForName(this.elementInfo[i].getClassName());
                UnionStatementGenerator stmtGen = new UnionStatementGenerator(storeMgr, clr, elementCls, true, null, null);
                stmtGen.setOption(StatementGenerator.OPTION_SELECT_NUCLEUS_TYPE);
                iteratorMappingDef.setNucleusTypeColumnName(UnionStatementGenerator.NUC_TYPE_COLUMN);
                SQLStatement subStmt = stmtGen.getStatement();


                // Select the required fields (of the element class)
                if (sqlStmt == null)
                {
                    SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(subStmt, iteratorMappingDef,
                        ownerSM.getExecutionContext().getFetchPlan(), subStmt.getPrimaryTable(), emd, 0);
                }
                else
                {
                    SQLStatementHelper.selectFetchPlanOfSourceClassInStatement(subStmt, null,
                        ownerSM.getExecutionContext().getFetchPlan(), subStmt.getPrimaryTable(), emd, 0);
                }


                if (sqlStmt == null)
                {
                    sqlStmt = subStmt;

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                throw new UnsupportedOperationException();
            }
        }


        // Use SQLOperation().getExpression(SQLExpression, SQLExpression)
        SQLStatement stmt = expr.getSQLStatement();
        try
        {
            operation = (SQLOperation)stmt.getClassLoaderResolver().classForName(sqlOperationClassName).newInstance();
            operation.setExpressionFactory(this);
            operationByOperationName.put(name, operation);


            return operation.getExpression(expr, expr2);
        }

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        RDBMSStoreManager storeMgr = stmt.getRDBMSManager();
        MetaDataManager mmgr = storeMgr.getMetaDataManager();
        AbstractMemberMetaData mmd = mapExpr.getJavaTypeMapping().getMemberMetaData();
        AbstractClassMetaData valCmd = mmd.getMap().getValueClassMetaData(clr, mmgr);
        MapTable joinTbl = (MapTable)storeMgr.getDatastoreContainerObject(mmd);
        SQLStatement subStmt = null;
        if (mmd.getMap().getMapType() == MapType.MAP_TYPE_JOIN)
        {
            // JoinTable Map
            if (valCmd == null)
            {
                // Map<?, Non-PC>
                subStmt = new SQLStatement(stmt, storeMgr, joinTbl, null, null);
                subStmt.setClassLoaderResolver(clr);
                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Restrict to map owner
                JavaTypeMapping ownerMapping = ((JoinTable)joinTbl).getOwnerMapping();
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (valIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), joinTbl.getValueMapping());
                    stmt.getQueryGenerator().bindVariable(varName, valCmd, valExpr.getSQLTable(), 
                        valExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to value
                    SQLExpression valIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
                        joinTbl.getValueMapping());
                    subStmt.whereAnd(valIdExpr.eq(valExpr), true);
                }
            }
            else
            {
                // Map<?, PC>
                DatastoreClass valTbl = storeMgr.getDatastoreClass(mmd.getMap().getValueType(), clr);
                subStmt = new SQLStatement(stmt, storeMgr, valTbl, null, null);
                subStmt.setClassLoaderResolver(clr);
                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Join to join table
                SQLTable joinSqlTbl = subStmt.innerJoin(subStmt.getPrimaryTable(), valTbl.getIdMapping(),
                    joinTbl, null, joinTbl.getValueMapping(), null, null);


                // Restrict to map owner
                JavaTypeMapping ownerMapping = joinTbl.getOwnerMapping();
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, joinSqlTbl, ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (valIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valTbl.getIdMapping());
                    stmt.getQueryGenerator().bindVariable(varName, valCmd, valExpr.getSQLTable(), 
                        valExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to value
                    SQLExpression valIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
                        valTbl.getIdMapping());
                    subStmt.whereAnd(valIdExpr.eq(valExpr), true);
                }
            }
        }
        else if (mmd.getMap().getMapType() == MapType.MAP_TYPE_KEY_IN_VALUE)
        {
            // Key stored in value table
            DatastoreClass valTbl = storeMgr.getDatastoreClass(mmd.getMap().getValueType(), clr);
            JavaTypeMapping ownerMapping = null;
            if (mmd.getMappedBy() != null)
            {
                ownerMapping = valTbl.getMemberMapping(valCmd.getMetaDataForMember(mmd.getMappedBy()));
            }
            else
            {
                ownerMapping = valTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_FK);
            }


            subStmt = new SQLStatement(stmt, storeMgr, valTbl, null, null);
            subStmt.setClassLoaderResolver(clr);
            JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
            subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


            // Restrict to map owner (on value table)
            SQLExpression ownerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), ownerMapping);
            SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                mapExpr.getSQLTable().getTable().getIdMapping());
            subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


            if (valIsUnbound)
            {
                // Bind the variable in the QueryGenerator
                valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valTbl.getIdMapping());
                stmt.getQueryGenerator().bindVariable(varName, valCmd, valExpr.getSQLTable(), 
                    valExpr.getJavaTypeMapping());
            }
            else
            {
                // Add restrict to value
                JavaTypeMapping valMapping = valTbl.getIdMapping();
                SQLExpression valIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valMapping);
                subStmt.whereAnd(valIdExpr.eq(valExpr), true);
            }
        }
        else if (mmd.getMap().getMapType() == MapType.MAP_TYPE_VALUE_IN_KEY)
        {
            AbstractClassMetaData keyCmd = mmd.getMap().getKeyClassMetaData(clr, mmgr);
            DatastoreClass keyTbl = storeMgr.getDatastoreClass(mmd.getMap().getKeyType(), clr);
            JavaTypeMapping ownerMapping = null;
            if (mmd.getMappedBy() != null)
            {
                ownerMapping = keyTbl.getMemberMapping(keyCmd.getMetaDataForMember(mmd.getMappedBy()));
            }
            else
            {
                ownerMapping = keyTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_FK);
            }


            AbstractMemberMetaData keyValMmd =
                keyCmd.getMetaDataForMember(mmd.getValueMetaData().getMappedBy());
            if (valCmd == null)
            {
                subStmt = new SQLStatement(stmt, storeMgr, keyTbl, null, null);
                subStmt.setClassLoaderResolver(clr);
                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Restrict to map owner (on key table)
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (valIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
                        keyTbl.getMemberMapping(keyValMmd));
                    stmt.getQueryGenerator().bindVariable(varName, valCmd, valExpr.getSQLTable(), 
                        valExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to value
                    JavaTypeMapping valMapping = keyTbl.getMemberMapping(keyValMmd);
                    SQLExpression valIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valMapping);
                    subStmt.whereAnd(valIdExpr.eq(valExpr), true);
                }
            }
            else
            {
                DatastoreClass valTbl = storeMgr.getDatastoreClass(mmd.getMap().getValueType(), clr);
                subStmt = new SQLStatement(stmt, storeMgr, valTbl, null, null);
                subStmt.setClassLoaderResolver(clr);
                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Join to key table
                SQLTable keySqlTbl = subStmt.innerJoin(subStmt.getPrimaryTable(), valTbl.getIdMapping(),
                    keyTbl, null, keyTbl.getMemberMapping(keyValMmd), null, null);


                // Restrict to map owner (on key table)
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, keySqlTbl, ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (valIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valTbl.getIdMapping());
                    stmt.getQueryGenerator().bindVariable(varName, valCmd, valExpr.getSQLTable(), 
                        valExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to value
                    SQLExpression valIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
                        valTbl.getIdMapping());
                    subStmt.whereAnd(valIdExpr.eq(valExpr), true);
                }
            }
        }


        return new BooleanSubqueryExpression(stmt, "EXISTS", subStmt);

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        else
        {
            throw new NucleusException("Invalid map for " + mapExpr + " in get() call");
        }


        SQLStatement subStmt = new SQLStatement(stmt, storeMgr, mapTbl, null, null);
        subStmt.setClassLoaderResolver(clr);
        SQLExpression valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valMapping);
        subStmt.select(valExpr, null);


        // Link to primary statement
        SQLExpression elementOwnerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
            ownerMapping);
        SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
            mapExpr.getSQLTable().getTable().getIdMapping());
        subStmt.whereAnd(elementOwnerExpr.eq(ownerIdExpr), true);


        // Condition on key
        SQLExpression keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), keyMapping);
        subStmt.whereAnd(keyExpr.eq(keyValExpr), true);


        SubqueryExpression subExpr = new SubqueryExpression(stmt, subStmt);
        subExpr.setJavaTypeMapping(valMapping);
        return subExpr;
    }

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Examples of org.datanucleus.store.rdbms.sql.SQLStatement

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