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.

        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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     * @param ownerSM StateManager for the owner object
     * @return The SQLStatement
     */
    protected SQLStatement getSQLStatementForIterator(ObjectProvider ownerSM)
    {
        SQLStatement sqlStmt = null;
        // TODO This is the same as RDBMSJoinSetStore


        final ClassLoaderResolver clr = ownerSM.getExecutionContext().getClassLoaderResolver();
        RDBMSStoreManager storeMgr = (RDBMSStoreManager)this.storeMgr;
        SQLExpressionFactory exprFactory = storeMgr.getSQLExpressionFactory();
        if (elementsAreEmbedded || elementsAreSerialised)
        {
            // Element = embedded, serialised (maybe Non-PC)
            // Just select the join table since we're going to return the embedded/serialised columns from it
            sqlStmt = new SQLStatement(storeMgr, containerTable, null, null);
            sqlStmt.setClassLoaderResolver(clr);


            // Select the element column - first select is assumed by SetStoreIterator
            sqlStmt.select(sqlStmt.getPrimaryTable(), elementMapping, null);
        }
        else if (elementMapping instanceof ReferenceMapping)
        {
            // Element = Reference type (interface/Object)
            // Just select the join table since we're going to return the implementation id columns only
            sqlStmt = new SQLStatement(storeMgr, containerTable, null, null);
            sqlStmt.setClassLoaderResolver(clr);


            // Select the reference column(s) - first select is assumed by SetStoreIterator
            sqlStmt.select(sqlStmt.getPrimaryTable(), elementMapping, null);
        }
        else
        {
            // Element = PC
            // Join to the element table(s)
            iteratorMappingClass = new StatementClassMapping();
            for (int i = 0; i < elementInfo.length; i++)
            {
                // TODO This will only work if all element types have a discriminator
                final int elementNo = i;
                final Class elementCls = clr.classForName(elementInfo[elementNo].getClassName());
                SQLStatement elementStmt = null;
                if (elementInfo[elementNo].getDiscriminatorStrategy() != null &&
                    elementInfo[elementNo].getDiscriminatorStrategy() != DiscriminatorStrategy.NONE)
                {
                    // The element uses a discriminator so just use that in the SELECT
                    String elementType = ownerMemberMetaData.getCollection().getElementType();

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                synchronized (this)
                {
                    // Generate the statement, and statement mapping/parameter information
                    iteratorMappingDef = new StatementClassMapping();
                    iteratorMappingParams = new StatementParameterMapping();
                    SQLStatement sqlStmt = getSQLStatementForIterator(ownerSM, startIdx, endIdx,
                        iteratorMappingDef, iteratorMappingParams);
                    iteratorStmtUnlocked = sqlStmt.getSelectStatement().toSQL();
                    sqlStmt.addExtension("lock-for-update", true);
                    iteratorStmtLocked = sqlStmt.getSelectStatement().toSQL();
                }
            }
            resultDefinition = iteratorMappingDef;
            paramDefinition = iteratorMappingParams;
            stmt = (useUpdateLock ? iteratorStmtLocked : iteratorStmtUnlocked);
        }
        else
        {
            // Iteration over a range so generate statement on the fly (uncached)
            resultDefinition = new StatementClassMapping();
            paramDefinition = new StatementParameterMapping();
            SQLStatement sqlStmt = getSQLStatementForIterator(ownerSM, startIdx, endIdx, resultDefinition,
                paramDefinition);
            sqlStmt.addExtension("lock-for-update", useUpdateLock);
            stmt = sqlStmt.getSelectStatement().toSQL();
        }


        try
        {
            ManagedConnection mconn = storeMgr.getConnection(ec);

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     * @return The SQLStatement
     */
    protected SQLStatement getSQLStatementForIterator(ObjectProvider ownerSM, int startIdx, int endIdx,
            StatementClassMapping resultMapping, StatementParameterMapping paramMapping)
    {
        SQLStatement sqlStmt = null;


        final ClassLoaderResolver clr = ownerSM.getExecutionContext().getClassLoaderResolver();
        RDBMSStoreManager storeMgr = (RDBMSStoreManager)this.storeMgr;
        if (elementsAreEmbedded || elementsAreSerialised)
        {
            // Element = embedded, serialised (maybe Non-PC)
            // Just select the join table since we're going to return the embedded/serialised columns from it
            sqlStmt = new SQLStatement(storeMgr, containerTable, null, null);
            sqlStmt.setClassLoaderResolver(clr);


            // Select the element column - first select is assumed by ListStoreIterator
            sqlStmt.select(sqlStmt.getPrimaryTable(), elementMapping, null);
        }
        else if (elementMapping instanceof ReferenceMapping)
        {
            // Element = Reference type (interface/Object)
            // Just select the join table since we're going to return the implementation id columns only
            sqlStmt = new SQLStatement(storeMgr, containerTable, null, null);
            sqlStmt.setClassLoaderResolver(clr);


            // Select the reference column(s) - first select is assumed by ListStoreIterator
            sqlStmt.select(sqlStmt.getPrimaryTable(), elementMapping, null);
        }
        else
        {
            // Element = PC
            // Join to the element table(s)
            for (int i = 0; i < elementInfo.length; i++)
            {
                // TODO This will only work if all element types have a discriminator
                final int elementNo = i;
                final Class elementCls = clr.classForName(elementInfo[elementNo].getClassName());
                SQLStatement elementStmt = null;
                if (elementInfo[elementNo].getDiscriminatorStrategy() != null &&
                    elementInfo[elementNo].getDiscriminatorStrategy() != DiscriminatorStrategy.NONE)
                {
                    // The element uses a discriminator so just use that in the SELECT
                    String elementType = ownerMemberMetaData.getCollection().getElementType();

View Full Code Here

        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)
        {
            String elementType = ownerMemberMetaData.getArray().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
            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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        {
            datastoreCompilation.setResultDefinitionForClass(new StatementClassMapping());
        }


        // Generate statement for candidate(s)
        SQLStatement stmt = RDBMSQueryUtils.getStatementForCandidates(null, candidateCmd,
            datastoreCompilation.getResultDefinitionForClass(), ec, candidateClass, subclasses, result, 
            compilation.getCandidateAlias(), compilation.getCandidateAlias());


        // Update the SQLStatement with filter, ordering, result etc
        Set<String> options = new HashSet<String>();
        options.add(QueryToSQLMapper.OPTION_CASE_INSENSITIVE);
        options.add(QueryToSQLMapper.OPTION_EXPLICIT_JOINS);
        QueryToSQLMapper sqlMapper = new QueryToSQLMapper(stmt, compilation, parameters,
            datastoreCompilation.getResultDefinitionForClass(), datastoreCompilation.getResultDefinition(),
            candidateCmd, getFetchPlan(), ec, null, options, extensions);
        sqlMapper.setDefaultJoinType(JoinType.INNER_JOIN);
        sqlMapper.compile();
        datastoreCompilation.setParameterNameByPosition(sqlMapper.getParameterNameByPosition());
        datastoreCompilation.setPrecompilable(sqlMapper.isPrecompilable());


        // Apply any range
        if (range != null)
        {
            long lower = fromInclNo;
            long upper = toExclNo;
            if (fromInclParam != null)
            {
                lower = ((Number)parameters.get(fromInclParam)).longValue();
            }
            if (toExclParam != null)
            {
                upper = ((Number)parameters.get(toExclParam)).longValue();
            }
            stmt.setRange(lower, upper-lower);
        }


        // Set any extensions
        boolean useUpdateLock = RDBMSQueryUtils.useUpdateLockForQuery(this);
        stmt.addExtension("lock-for-update", Boolean.valueOf(useUpdateLock));


        datastoreCompilation.setSQL(stmt.getSelectStatement().toString());
        datastoreCompilation.setStatementParameters(stmt.getSelectStatement().getParametersForStatement());


        if (NucleusLogger.QUERY.isDebugEnabled())
        {
            NucleusLogger.QUERY.debug(LOCALISER.msg("021084", getLanguage(), System.currentTimeMillis()-startTime));
        }

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        StatementClassMapping resultsDef = new StatementClassMapping();
        datastoreCompilation.setResultDefinitionForClass(resultsDef);


        // Generate statement for candidate(s)
        SQLStatement stmt = RDBMSQueryUtils.getStatementForCandidates(null, candidateCmd,
            datastoreCompilation.getResultDefinitionForClass(), ec, candidateClass, subclasses, result, null, null);


        if (stmt.allUnionsForSamePrimaryTable())
        {
            // Select fetch-plan fields of candidate class
            SQLStatementHelper.selectFetchPlanOfCandidateInStatement(stmt,
                datastoreCompilation.getResultDefinitionForClass(), candidateCmd, getFetchPlan(), 1);
        }
        else
        {
            // Select id only since tables don't have same mappings or column names
            // TODO complete-table will come through here but maybe ought to be treated differently
            SQLStatementHelper.selectIdentityOfCandidateInStatement(stmt,
                datastoreCompilation.getResultDefinitionForClass(), candidateCmd);
        }


        datastoreCompilation.setSQL(stmt.getSelectStatement().toString());
        datastoreCompilation.setStatementParameters(stmt.getSelectStatement().getParametersForStatement());
    }

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            return;
        }


        // Generate statement for candidate
        StatementClassMapping resultsDef = new StatementClassMapping();
        SQLStatement stmt = RDBMSQueryUtils.getStatementForCandidates(null, candidateCmd,
            resultsDef, ec, candidateClass, subclasses, result, null, null);


        Set<String> options = new HashSet<String>();
        options.add(QueryToSQLMapper.OPTION_CASE_INSENSITIVE);
        options.add(QueryToSQLMapper.OPTION_EXPLICIT_JOINS);
        QueryToSQLMapper sqlMapper = new QueryToSQLMapper(stmt, compilation, parameterValues,
            resultsDef, null, candidateCmd, getFetchPlan(), ec, null, options, extensions);
        sqlMapper.setDefaultJoinType(JoinType.INNER_JOIN);
        sqlMapper.compile();


        // The assumption here is that the SQL UPDATE statement generated will not need to use multiple
        // tables. This means that the SET clause only refers to the table of the candidate, and that
        // the WHERE clause only refers to the table of the candidate.
        // It is possible with some RDBMS e.g MySQL that support multiple table update syntax
        // that these 2 conditions don't need to be enforced.
        DatastoreAdapter dba = ((RDBMSStoreManager)ec.getStoreManager()).getDatastoreAdapter();
        if (stmt.getNumberOfTables() > 0 && !dba.supportsOption(RDBMSAdapter.UPDATE_MULTITABLE))
        {
            throw new NucleusDataStoreException("Bulk update requires use of multiple tables yet datastore doesnt allow multiple table syntax");
        }
        datastoreCompilation.setSQL(stmt.getUpdateStatement().toString());
        datastoreCompilation.setStatementParameters(stmt.getSelectStatement().getParametersForStatement());
    }

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            }
        }


        // Generate statement for candidate
        StatementClassMapping resultsDef = new StatementClassMapping();
        SQLStatement stmt = RDBMSQueryUtils.getStatementForCandidates(null, candidateCmd,
            resultsDef, ec, candidateClass, subclasses, result, null, null);


        Set<String> options = new HashSet<String>();
        options.add(QueryToSQLMapper.OPTION_CASE_INSENSITIVE);
        options.add(QueryToSQLMapper.OPTION_EXPLICIT_JOINS);
        QueryToSQLMapper sqlMapper = new QueryToSQLMapper(stmt, compilation, parameterValues,
            resultsDef, null, candidateCmd, getFetchPlan(), ec, null, options, extensions);
        sqlMapper.setDefaultJoinType(JoinType.INNER_JOIN);
        sqlMapper.compile();


        // This currently assumes that we only need to delete from one table.
        // TODO Delete entity from all populated tables
        datastoreCompilation.setSQL(stmt.getDeleteStatement().toString());
        datastoreCompilation.setStatementParameters(stmt.getSelectStatement().getParametersForStatement());
    }

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

Table Groups

Table Aliases

Related Classes of org.datanucleus.store.rdbms.sql.SQLStatement