com.webobjects.jdbcadaptor
Class DerbyPlugIn.DerbyExpression

java.lang.Object
  com.webobjects.eoaccess.EOSQLExpression
      com.webobjects.jdbcadaptor.JDBCExpression
          com.webobjects.jdbcadaptor.DerbyPlugIn.DerbyExpression

Enclosing class:

DerbyPlugIn

public static class DerbyPlugIn.DerbyExpression
extends JDBCExpression

Nested Class Summary

Nested classes/interfaces inherited from class com.webobjects.eoaccess.EOSQLExpression

EOSQLExpression.SQLValue

Field Summary

Fields inherited from class com.webobjects.eoaccess.EOSQLExpression

BindVariableAttributeKey, BindVariableColumnKey, BindVariableNameKey, BindVariablePlaceHolderKey, BindVariableValueKey

Constructor Summary

DerbyPlugIn.DerbyExpression(EOEntity entity)

Method Summary

String	assembleUpdateStatementWithRow(NSDictionary row, EOQualifier qualifier, String tableList, String updateList, String whereClause) This method is invoked from prepareUpdateExpressionWithRow to return an SQL UPDATE statement.
String	formatValueForAttribute(Object value, EOAttribute attribute) This method should be overridden by subclasses to return a string representation of value suitable for use in an SQL statement, depending on attribute's externalType.
boolean	mustUseBindVariableForAttribute(EOAttribute att) Returns true if the receiver must use bind variables for attribute, false otherwise.
boolean	shouldUseBindVariableForAttribute(EOAttribute att) Returns true if the receiver can provide a bind variable dictionary for attribute, false otherwise.

Methods inherited from class com.webobjects.jdbcadaptor.JDBCExpression

addSelectListAttribute, allowsNullClauseForConstraint, appendItemToListString, appendItemToOrderByString, appendItemToValueListString, bindVariableDictionaryForAttribute, columnTypeStringForAttribute, externalNameQuoteCharacter, jdbcInfo, lockClause, prepareSelectExpressionWithAttributes, setJDBCInfo, useBindVariables

Methods inherited from class com.webobjects.eoaccess.EOSQLExpression

addBindVariableDictionary, addCreateClauseForAttribute, addInsertListAttribute, addJoinClause, addOrderByAttributeOrdering, addUpdateListAttribute, aliasesByRelationshipPath, appendItemToListString, assembleDeleteStatementWithQualifier, assembleInsertStatementWithRow, assembleJoinClause, assembleSelectStatementWithAttributes, bindVariableDictionaries, entity, formatSQLString, formatStringValue, joinClauseString, joinExpression, listString, orderByString, prepareConstraintStatementForRelationship, prepareDeleteExpressionForQualifier, prepareInsertExpressionWithRow, prepareUpdateExpressionWithRow, setStatement, setUseAliases, setUseBindVariables, setUseQuotedExternalNames, sqlEscapeChar, sqlPatternFromShellPattern, sqlPatternFromShellPatternWithEscapeCharacter, sqlStringForAttribute, sqlStringForAttributeNamed, sqlStringForAttributePath, sqlStringForCaseInsensitiveLike, sqlStringForConjoinedQualifiers, sqlStringForData, sqlStringForDisjoinedQualifiers, sqlStringForKeyComparisonQualifier, sqlStringForKeyValueQualifier, sqlStringForNegatedQualifier, sqlStringForNumber, sqlStringForQualifier, sqlStringForSchemaObjectName, sqlStringForSelector, sqlStringForString, sqlStringForValue, statement, tableListWithRootEntity, toString, useAliases, useQuotedExternalNames, valueList, whereClauseString

Methods inherited from class java.lang.Object

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

Constructor Detail

DerbyPlugIn.DerbyExpression

public DerbyPlugIn.DerbyExpression(EOEntity entity)

Method Detail

shouldUseBindVariableForAttribute

public boolean shouldUseBindVariableForAttribute(EOAttribute att)

Description copied from class: EOSQLExpression

Returns true if the receiver can provide a bind variable dictionary for attribute, false otherwise. Bind variables aren't used for values associated with this attribute when useBindVariables returns false. EOSQLExpression's implementation returns false. An SQL expression subclass should override this method to return true if the receiver should use bind variables for attributes with attribute's external type. It should also return true for any attribute for which the receiver must use bind variables.

Overrides:

shouldUseBindVariableForAttribute in class JDBCExpression

Parameters:

att - the EOAttribute associated with the bind variable dictionary

Returns:

always true for JDBC

See Also:

EOSQLExpression.mustUseBindVariableForAttribute(EOAttribute attribute), EOSQLExpression.useBindVariables()

mustUseBindVariableForAttribute

public boolean mustUseBindVariableForAttribute(EOAttribute att)

Description copied from class: EOSQLExpression

Returns true if the receiver must use bind variables for attribute, false otherwise. EOSQLExpression's implementation returns false. An SQL expression subclass that uses bind variables should override this method to return true if the underlying RDBMS requires that bind variables be used for attributes with attribute's external type.

Overrides:

mustUseBindVariableForAttribute in class JDBCExpression

Parameters:

att - the EOAttribute associated with the bind variable dictionary

Returns:

always true for JDBC

See Also:

EOSQLExpression.shouldUseBindVariableForAttribute(EOAttribute anEOAttribute), EOSQLExpression.bindVariableDictionaryForAttribute(EOAttribute attribute, Object value)

formatValueForAttribute

public String formatValueForAttribute(Object value,
                                      EOAttribute attribute)

Description copied from class: EOSQLExpression

This method should be overridden by subclasses to return a string representation of value suitable for use in an SQL statement, depending on attribute's externalType. For example, a subclass might format a date using a special database-specific syntax or standard form or truncate numbers to attribute's precision and scale. EOSQLExpression's implementation merely returns the string representation of value.

Overrides:

formatValueForAttribute in class JDBCExpression

Parameters:

value - an object to be used in a SQL statement

attribute - an EOAttribute to be used in influencing the format

Returns:

a formatted string

See Also:

EOAttribute

assembleUpdateStatementWithRow

public String assembleUpdateStatementWithRow(NSDictionary row,
                                             EOQualifier qualifier,
                                             String tableList,
                                             String updateList,
                                             String whereClause)

Description copied from class: EOSQLExpression

This method is invoked from prepareUpdateExpressionWithRow to return an SQL UPDATE statement. The statement is of the form:

         UPDATE tableList
         SET updateList
         WHERE whereClause
 

row and qualifier are the arguments to prepareUpdateExpressionWithRow from which updateList and whereClause were derived. They are provided for subclasses that need to generate the clauses of the UPDATE statement in a particular way.

Overrides:

assembleUpdateStatementWithRow in class EOSQLExpression

Parameters:

row - an NSDictionary containing the row data

qualifier - an EOQualifier for finding the row to update

tableList - SQL table list

updateList - SQL update list

whereClause - SQL where clause

Returns:

a constructed SQL UPDATE statement

See Also:

EOSQLExpression.prepareUpdateExpressionWithRow(NSDictionary row, EOQualifier qualifier)