Examples of org.apache.openjpa.jdbc.schema.PrimaryKey

org.apache.openjpa.jdbc.schema.PrimaryKey
Represents a table primary key. It can also represent a partial key, aligning with the key information available from {@link java.sql.DatabaseMetaData}. @author Abe White

            RelationStrategies.mapRelationToUnmappedPC(field, field.getName(),
                adapt);


        field.setUseClassCriteria(criteria);
        field.mapPrimaryKey(adapt);
        PrimaryKey pk = field.getTable().getPrimaryKey();
        if (field.isPrimaryKey()) {
            Column[] cols = field.getColumns();
            if (pk != null && (adapt || pk.isLogical()))
                for (int i = 0; i < cols.length; i++)
                    pk.addColumn(cols[i]);
            for (int i = 0; i < cols.length; i++)
                field.getDefiningMapping().setJoinable(cols[i], this);
        }


        // map constraints after pk so we don't re-index / re-unique pk col

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        // add an identity column if we do not already have one
        if (!hasIdentity)
            buf.append(", ").append(identityColumnName).
                append(" NUMERIC IDENTITY UNIQUE");


        PrimaryKey pk = table.getPrimaryKey();
        if (pk != null)
            buf.append(", ").append(getPrimaryKeyConstraintSQL(pk));


        Unique[] unqs = table.getUniques();
        String unqStr;

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    /**
     * Create a new primary key from the information in the schema metadata.
     */
    protected PrimaryKey newPrimaryKey(ResultSet pkMeta)
        throws SQLException {
        PrimaryKey pk = new PrimaryKey();
        pk.setSchemaIdentifier(fromDBName(getStringFromResultSet(pkMeta, "TABLE_SCHEM", "table_owner"),
            DBIdentifierType.SCHEMA));
        pk.setTableIdentifier(fromDBName(getStringFromResultSet(pkMeta, "TABLE_NAME", "table_name"),
            DBIdentifierType.TABLE));
        pk.setColumnIdentifier(fromDBName(getStringFromResultSet(pkMeta, "COLUMN_NAME", "column_name"),
            DBIdentifierType.COLUMN));
        pk.setIdentifier(fromDBName(getStringFromResultSet(pkMeta, "PK_NAME", "index_name"),
            DBIdentifierType.CONSTRAINT));
        return pk;
    }

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        // add an identity column if we do not already have one
        if (!hasIdentity)
            buf.append(", ").append(identityColumnName).
                append(" NUMERIC IDENTITY UNIQUE");


        PrimaryKey pk = table.getPrimaryKey();
        if (pk != null)
            buf.append(", ").append(getPrimaryKeyConstraintSQL(pk));


        Unique[] unqs = table.getUniques();
        String unqStr;

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    /**
     * Create a new primary key from the information in the schema metadata.
     */
    protected PrimaryKey newPrimaryKey(ResultSet pkMeta)
        throws SQLException {
        PrimaryKey pk = new PrimaryKey();
        pk.setSchemaIdentifier(fromDBName(getStringFromResultSet(pkMeta, "TABLE_SCHEM", "table_owner"),
            DBIdentifierType.SCHEMA));
        pk.setTableIdentifier(fromDBName(getStringFromResultSet(pkMeta, "TABLE_NAME", "table_name"),
            DBIdentifierType.TABLE));
        pk.setColumnIdentifier(fromDBName(getStringFromResultSet(pkMeta, "COLUMN_NAME", "column_name"),
            DBIdentifierType.COLUMN));
        pk.setIdentifier(fromDBName(getStringFromResultSet(pkMeta, "PK_NAME", "index_name"),
            DBIdentifierType.CONSTRAINT));
        return pk;
    }

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        }


        // do this before getting the columns so we know how to handle
        // the last comma
        StringBuilder endBuf = new StringBuilder();
        PrimaryKey pk = table.getPrimaryKey();
        String pkStr;
        if (pk != null) {
            pkStr = getPrimaryKeyConstraintSQL(pk);
            if (pkStr != null)
                endBuf.append(pkStr);

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    /**
     * Create a new primary key from the information in the schema metadata.
     */
    protected PrimaryKey newPrimaryKey(ResultSet pkMeta)
        throws SQLException {
        PrimaryKey pk = new PrimaryKey();
        pk.setSchemaIdentifier(fromDBName(pkMeta.getString("TABLE_SCHEM"), DBIdentifierType.SCHEMA));
        pk.setTableIdentifier(fromDBName(pkMeta.getString("TABLE_NAME"), DBIdentifierType.TABLE));
        pk.setColumnIdentifier(fromDBName(pkMeta.getString("COLUMN_NAME"), DBIdentifierType.COLUMN));
        pk.setIdentifier(fromDBName(pkMeta.getString("PK_NAME"), DBIdentifierType.CONSTRAINT));
        return pk;
    }

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            pks = meta.getBestRowIdentifier(toDBName(catalog), toDBName(schemaName),
                toDBName(tableName), 0, false);


            List pkList = new ArrayList();
            while (pks != null && pks.next()) {
                PrimaryKey pk = new PrimaryKey();
                pk.setSchemaIdentifier(schemaName);
                pk.setTableIdentifier(tableName);
                pk.setColumnIdentifier(fromDBName(pks.getString("COLUMN_NAME"), DBIdentifierType.COLUMN));
                pkList.add(pk);
            }
            return (PrimaryKey[]) pkList.toArray
                (new PrimaryKey[pkList.size()]);
        } finally {

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    /**
     * Return whether the given foreign key is unique.
     */
    public boolean isUnique(ForeignKey fk) {
        PrimaryKey pk = fk.getTable().getPrimaryKey();
        if (pk != null && pk.columnsMatch(fk.getColumns()))
            return true;
        Index[] idx = fk.getTable().getIndexes();
        for (int i = 0; i < idx.length; i++)
            if (idx[i].isUnique() && idx[i].columnsMatch(fk.getColumns()))
                return true;

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     * If the given table has a single unique foreign key or a foreign
     * key that matches the primary key, return it. Else return null.
     */
    public ForeignKey getUniqueForeignKey(Table table) {
        ForeignKey[] fks = table.getForeignKeys();
        PrimaryKey pk = table.getPrimaryKey();
        ForeignKey unq = null;
        int count = 0;
        for (int i = 0; i < fks.length; i++) {
            if (pk != null && pk.columnsMatch(fks[i].getColumns()))
                return fks[i];
            if (!isUnique(fks[i]))
                continue;


            count++;

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