org.mmbase.storage.search.implementation.database
Class InformixSqlHandler

java.lang.Object
  org.mmbase.storage.search.implementation.database.BasicSqlHandler
      org.mmbase.storage.search.implementation.database.InformixSqlHandler

All Implemented Interfaces:

SqlHandler

public class InformixSqlHandler

extends BasicSqlHandler

implements SqlHandler

The Informix query handler, implements SqlHandler for standard Informix functionality.
Derived from BasicSqlHandler, overrides

• toSql(), implements FEATURE_MAX_NUMBER, by adding a construct like "SELECT FIRST 20" in front of the body, when appropriate.
• getSupportLevel(int,SearchQuery), returns SUPPORT_OPTIMAL for this feature, delegates to the superclass for other features.

Since:

MMBase-1.7

Version:

$Id: InformixSqlHandler.java,v 1.8.2.6 2004/08/30 11:41:48 mark Exp $

Author:

Rob van Maris

Constructor Summary

InformixSqlHandler(java.util.Map disallowedValues)
Constructor.

Method Summary

void	appendQueryBodyToSql(java.lang.StringBuffer sb, SearchQuery query, SqlHandler firstInChain) Represents body of a SearchQuery object as a string in SQL format, using the database configuration.
int	getSupportLevel(int feature, SearchQuery query) Gets the level at which a feature is supported for a query by this handler.
java.lang.String	toSql(SearchQuery query, SqlHandler firstInChain) Represents a SearchQuery object as a string in SQL format, using the database configuration.

Methods inherited from class org.mmbase.storage.search.implementation.database.BasicSqlHandler

appendCompositeConstraintToSql, appendConstraintToSql, appendField, appendFieldValue, appendLikeOperator, getAllowedValue, getSupportLevel, toSqlString, useLower

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mmbase.storage.search.implementation.database.SqlHandler

appendConstraintToSql, getAllowedValue, getSupportLevel

Constructor Detail

InformixSqlHandler

public InformixSqlHandler(java.util.Map disallowedValues)

Constructor.

Parameters:

disallowedValues - Map mapping disallowed table/fieldnames to allowed alternatives.

Method Detail

getSupportLevel

public int getSupportLevel(int feature,
                           SearchQuery query)
                    throws SearchQueryException

Description copied from interface: SqlHandler

Gets the level at which a feature is supported for a query by this handler. This is one of either:

• SUPPORT_NONE
• SUPPORT_WEAK
• SUPPORT_NORMAL
• SUPPORT_OPTIMAL

Given the choice, the query handler with the highest level of support is prefered.

Specified by:

getSupportLevel in interface SqlHandler

Overrides:

getSupportLevel in class BasicSqlHandler

Throws:

SearchQueryException

toSql

public java.lang.String toSql(SearchQuery query,
                              SqlHandler firstInChain)
                       throws SearchQueryException

Description copied from interface: SqlHandler

Represents a SearchQuery object as a string in SQL format, using the database configuration.

Specified by:

toSql in interface SqlHandler

Overrides:

toSql in class BasicSqlHandler

Throws:

SearchQueryException

appendQueryBodyToSql

public void appendQueryBodyToSql(java.lang.StringBuffer sb,
                                 SearchQuery query,
                                 SqlHandler firstInChain)
                          throws SearchQueryException

Description copied from interface: SqlHandler

Represents body of a SearchQuery object as a string in SQL format, using the database configuration. Appends this to a stringbuffer.
The body of the SQL query string is defined as the substring containing fields, tables, constraints and orders.

Specified by:

appendQueryBodyToSql in interface SqlHandler

Overrides:

appendQueryBodyToSql in class BasicSqlHandler

Throws:

SearchQueryException