er.extensions.jdbc

Class ERXSQLHelper.DB2SQLHelper

java.lang.Object

er.extensions.jdbc.ERXSQLHelper

er.extensions.jdbc.ERXSQLHelper.DB2SQLHelper

Enclosing class:

ERXSQLHelper

public static class ERXSQLHelper.DB2SQLHelper
extends ERXSQLHelper

Nested Class Summary

Nested classes/interfaces inherited from class er.extensions.jdbc.ERXSQLHelper

ERXSQLHelper.ColumnIndex, ERXSQLHelper.CustomTypes, ERXSQLHelper.DB2SQLHelper, ERXSQLHelper.DerbySQLHelper, ERXSQLHelper.EROracleSQLHelper, ERXSQLHelper.FirebirdSQLHelper, ERXSQLHelper.FrontBaseSQLHelper, ERXSQLHelper.H2SQLHelper, ERXSQLHelper.MicrosoftSQLHelper, ERXSQLHelper.MySQLSQLHelper, ERXSQLHelper.NoSQLHelper, ERXSQLHelper.OpenBaseSQLHelper, ERXSQLHelper.OracleSQLHelper, ERXSQLHelper.PostgresqlSQLHelper

Constructor Summary

Constructors

Constructor and Description
DB2SQLHelper()

Method Summary

Modifier and Type	Method and Description
protected boolean	canReliablyPerformDistinctWithSortOrderings() Returns whether or not this database can always perform the a distinct operation when sort orderings are applied.
protected char	commandSeparatorChar() This is totally cheating ...
protected String	commandSeparatorString()
String	createIndexSQLForEntities(NSArray<com.webobjects.eoaccess.EOEntity> entities, NSArray<String> externalTypesToIgnore)
String	limitExpressionForSQL(com.webobjects.eoaccess.EOSQLExpression expression, com.webobjects.eocontrol.EOFetchSpecification fetchSpecification, String sql, long start, long end)
String	migrationTableName() Returns the name of the table to use for database migrations.
boolean	reassignExternalTypeForValueTypeOverride(EOAttribute attribute)
String	sqlForCreateIndex(String indexName, String tableName, ERXSQLHelper.ColumnIndex... columnIndexes) Returns the SQL expression for creating an index on the given set of columns
String	sqlForCreateUniqueIndex(String indexName, String tableName, ERXSQLHelper.ColumnIndex... columnIndexes) Returns the SQL expression for creating a unique index on the given set of columns
protected String	sqlForGetNextValFromSequencedNamed(String sequenceName) Returns the SQL required to select the next value from the given sequence.
protected String	sqlForSubquery(String subquery, String alias) Returns the syntax for using the given query as an aliased subquery in a from-clause.
int	varcharLargeJDBCType() For DB2, it seems the right thing to do for varcharLarge is to use a Clob column.

Methods inherited from class er.extensions.jdbc.ERXSQLHelper

_groupByOrHavingIndex, _orderByIndex, addGroupByClauseToExpression, addGroupByClauseToExpression, addHavingCountClauseToExpression, appendItemToListString, attributesToFetchForEntity, columnIndexesFromColumnNames, columnNamesFromColumnIndexes, commentPattern, createDependentSchemaSQLForEntities, createIndexSQLForEntities, createSchemaSQLForEntitiesInDatabaseContext, createSchemaSQLForEntitiesInModel, createSchemaSQLForEntitiesInModelAndOptions, createSchemaSQLForEntitiesInModelWithName, createSchemaSQLForEntitiesInModelWithNameAndOptions, createSchemaSQLForEntitiesWithOptions, createSchemaSQLForEntitiesWithOptions, customQueryExpressionHintAsString, defaultOptionDictionary, externalTypeForJDBCType, formatValueForAttribute, getNextValFromSequenceNamed, handleDatabaseException, jdbcTypeForCustomType, maximumElementPerInClause, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, newSQLHelper, prepareConnectionForSchemaChange, quoteColumnName, readFormatForAggregateFunction, readFormatForAggregateFunction, removeSelectFromExpression, restoreConnectionSettingsAfterSchemaChange, rowCountForFetchSpecification, shouldExecute, shouldPerformDistinctInMemory, splitSQLStatements, splitSQLStatementsFromFile, splitSQLStatementsFromInputStream, sqlExpressionForFetchSpecification, sqlExpressionForFetchSpecification, sqlForCountDistinct, sqlForCreateIndex, sqlForCreateUniqueIndex, sqlForFullTextQuery, sqlForRegularExpressionQuery, sqlWhereClauseStringForKey, varcharLargeColumnWidth

Methods inherited from class java.lang.Object

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

Constructor Detail

DB2SQLHelper

public DB2SQLHelper()

Method Detail

sqlForSubquery

protected String sqlForSubquery(String subquery,
                                String alias)

Description copied from class: ERXSQLHelper

Returns the syntax for using the given query as an aliased subquery in a from-clause.

Overrides:

sqlForSubquery in class ERXSQLHelper

Parameters:

subquery - the subquery to wrap

alias - the alias to use

Returns:

the formatted subquery expression

sqlForGetNextValFromSequencedNamed

protected String sqlForGetNextValFromSequencedNamed(String sequenceName)

Description copied from class: ERXSQLHelper

Returns the SQL required to select the next value from the given sequence. This should return a single row with a single column.

Overrides:

sqlForGetNextValFromSequencedNamed in class ERXSQLHelper

Parameters:

sequenceName - the name of the sequence

Returns:

the next sequence value

limitExpressionForSQL

public String limitExpressionForSQL(com.webobjects.eoaccess.EOSQLExpression expression,
                                    com.webobjects.eocontrol.EOFetchSpecification fetchSpecification,
                                    String sql,
                                    long start,
                                    long end)

Overrides:

limitExpressionForSQL in class ERXSQLHelper

commandSeparatorChar

protected char commandSeparatorChar()

Description copied from class: ERXSQLHelper

This is totally cheating ... But I just need the separator character for now. We can rewrite the script parser later. Actually, somewhere on earth there is already a sql parser or two. Probably worth getting that one.

Overrides:

commandSeparatorChar in class ERXSQLHelper

Returns:

the separator character used by this database

commandSeparatorString

protected String commandSeparatorString()

Overrides:

commandSeparatorString in class ERXSQLHelper

createIndexSQLForEntities

public String createIndexSQLForEntities(NSArray<com.webobjects.eoaccess.EOEntity> entities,
                                        NSArray<String> externalTypesToIgnore)

Overrides:

createIndexSQLForEntities in class ERXSQLHelper

sqlForCreateUniqueIndex

public String sqlForCreateUniqueIndex(String indexName,
                                      String tableName,
                                      ERXSQLHelper.ColumnIndex... columnIndexes)

Description copied from class: ERXSQLHelper

Returns the SQL expression for creating a unique index on the given set of columns

Overrides:

sqlForCreateUniqueIndex in class ERXSQLHelper

Parameters:

indexName - the name of the index to create

tableName - the name of the containing table

columnIndexes - the list of columns to index on

Returns:

a SQL expression

sqlForCreateIndex

public String sqlForCreateIndex(String indexName,
                                String tableName,
                                ERXSQLHelper.ColumnIndex... columnIndexes)

Description copied from class: ERXSQLHelper

Returns the SQL expression for creating an index on the given set of columns

Overrides:

sqlForCreateIndex in class ERXSQLHelper

Parameters:

indexName - the name of the index to create

tableName - the name of the containing table

columnIndexes - the list of columns to index on

Returns:

a SQL expression

migrationTableName

public String migrationTableName()

Description copied from class: ERXSQLHelper

Returns the name of the table to use for database migrations.

Overrides:

migrationTableName in class ERXSQLHelper

Returns:

the name of the table to use for database migrations

reassignExternalTypeForValueTypeOverride

public boolean reassignExternalTypeForValueTypeOverride(EOAttribute attribute)

Overrides:

reassignExternalTypeForValueTypeOverride in class ERXSQLHelper

canReliablyPerformDistinctWithSortOrderings

protected boolean canReliablyPerformDistinctWithSortOrderings()

Description copied from class: ERXSQLHelper

Returns whether or not this database can always perform the a distinct operation when sort orderings are applied. Oracle, for instance, will fail if you try to sort on a key that isn't in the list of fetched keys.

Overrides:

canReliablyPerformDistinctWithSortOrderings in class ERXSQLHelper

Returns:

whether or not this database can always perform the a distinct operation when sort orderings are applied

varcharLargeJDBCType

public int varcharLargeJDBCType()

For DB2, it seems the right thing to do for varcharLarge is to use a Clob column. CLOB is limited to 2GB where as VARCHAR is limited to 32672 bytes and a LONG VARCHAR to 32700

Overrides:

varcharLargeJDBCType in class ERXSQLHelper

Returns:

the JDBCType that should be used for a varcharLarge column in migrations