org.apache.metamodel.jdbc.dialects

Class DB2QueryRewriter

java.lang.Object

org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

org.apache.metamodel.jdbc.dialects.RowNumberQueryRewriter

org.apache.metamodel.jdbc.dialects.DB2QueryRewriter

All Implemented Interfaces:

IQueryRewriter

public class DB2QueryRewriter
extends RowNumberQueryRewriter

Query rewriter for IBM DB2

Constructor Summary

Constructors

Constructor and Description
DB2QueryRewriter(JdbcDataContext dataContext)

Method Summary

Modifier and Type	Method and Description
String	escapeQuotes(String filterItemOperand) Escapes the quotes within a String literal of a query item.
boolean	isFirstRowSupported(Query query) Gets whether this query rewriter is able to write the "First row" query property to the query string.
boolean	isMaxRowsSupported() Gets whether this query rewriter is able to write the "Max rows" query property to the query string.
boolean	isSchemaIncludedInColumnPaths() DB2 expects the fully qualified column name, including schema, in select items.
String	rewriteColumnType(ColumnType columnType, Integer columnSize) Rewrites the name of a column type, as it is written in CREATE TABLE statements.
String	rewriteFilterItem(FilterItem item)
String	rewriteQuery(Query query)

Methods inherited from class org.apache.metamodel.jdbc.dialects.RowNumberQueryRewriter

getRowNumberSql

Methods inherited from class org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

beforeRewrite, isAggregateFunctionSupported, isPrimaryKeySupported, isScalarFunctionSupported, needsQuoting, rewriteFilterItemWithOperandLiteral, rewriteTimestamp

Methods inherited from class org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

getColumnType, getDataContext, getResultSetValue, isSupportedVersion, isTransactional, rewriteColumnTypeInternal, rewriteFromClause, rewriteFromItem, rewriteFromItem, rewriteGroupByClause, rewriteGroupByItem, rewriteHavingClause, rewriteOrderByClause, rewriteOrderByItem, rewriteSelectClause, rewriteSelectItem, rewriteWhereClause, setStatementParameter, toTime, toTimestamp

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DB2QueryRewriter

public DB2QueryRewriter(JdbcDataContext dataContext)

Method Detail

escapeQuotes

public String escapeQuotes(String filterItemOperand)

Description copied from interface: IQueryRewriter

Escapes the quotes within a String literal of a query item.

Specified by:

escapeQuotes in interface IQueryRewriter

Overrides:

escapeQuotes in class DefaultQueryRewriter

Returns:

String item with quotes escaped.

isSchemaIncludedInColumnPaths

public boolean isSchemaIncludedInColumnPaths()

DB2 expects the fully qualified column name, including schema, in select items.

Overrides:

isSchemaIncludedInColumnPaths in class AbstractQueryRewriter

isMaxRowsSupported

public boolean isMaxRowsSupported()

Description copied from interface: IQueryRewriter

Gets whether this query rewriter is able to write the "Max rows" query property to the query string.

Specified by:

isMaxRowsSupported in interface IQueryRewriter

Overrides:

isMaxRowsSupported in class DefaultQueryRewriter

Returns:

whether this query rewriter is able to write the "Max rows" query property to the query string.

isFirstRowSupported

public boolean isFirstRowSupported(Query query)

Description copied from interface: IQueryRewriter

Gets whether this query rewriter is able to write the "First row" query property to the query string.

Specified by:

isFirstRowSupported in interface IQueryRewriter

Overrides:

isFirstRowSupported in class DefaultQueryRewriter

Parameters:

query - For some database engines, the content of the query decides the ability to change first row

Returns:

whether this query rewriter is able to write the "First row" query property to the query string.

rewriteQuery

public String rewriteQuery(Query query)

Specified by:

rewriteQuery in interface IQueryRewriter

Overrides:

rewriteQuery in class AbstractQueryRewriter

rewriteColumnType

public String rewriteColumnType(ColumnType columnType,
                                Integer columnSize)

Description copied from interface: IQueryRewriter

Rewrites the name of a column type, as it is written in CREATE TABLE statements. Some databases dont support all column types, or have different names for them. The implementation of this method will do that conversion.

Specified by:

rewriteColumnType in interface IQueryRewriter

Overrides:

rewriteColumnType in class DefaultQueryRewriter

Parameters:

columnType - the (non-null) ColumnType to rewrite

columnSize - the (possibly null) column size that may or may not have been specified

Returns:

rewriteFilterItem

public String rewriteFilterItem(FilterItem item)

Specified by:

rewriteFilterItem in interface IQueryRewriter

Overrides:

rewriteFilterItem in class DefaultQueryRewriter