Module bus.pager

Package org.miaixz.bus.pager.dialect.base

Class Db2

java.lang.Object

org.miaixz.bus.pager.dialect.AbstractDialect

org.miaixz.bus.pager.dialect.AbstractPaging

org.miaixz.bus.pager.dialect.base.Db2

All Implemented Interfaces:

Dialect

public class Db2
extends AbstractPaging

Database dialect for DB2. This class provides DB2-specific implementations for pagination SQL generation and parameter processing.

Since:

Java 17+

Author:

Kimi Liu

Field Summary

Fields inherited from class org.miaixz.bus.pager.dialect.AbstractPaging

PAGEPARAMETER_FIRST, PAGEPARAMETER_SECOND, SUFFIX_COUNT, SUFFIX_PAGE

Fields inherited from class org.miaixz.bus.pager.dialect.AbstractDialect

countSqlParser, orderBySqlParser

Constructor Summary

Constructors

Constructor	Description
Db2()

Method Summary

Modifier and Type	Method	Description
String	getPageSql(String sql, Page page, org.apache.ibatis.cache.CacheKey pageKey)	Generates the DB2-specific pagination SQL.
Object	processPageParameter(org.apache.ibatis.mapping.MappedStatement ms, Map<String,Object> paramMap, Page page, org.apache.ibatis.mapping.BoundSql boundSql, org.apache.ibatis.cache.CacheKey pageKey)	Processes the pagination parameters for DB2.

Methods inherited from class org.miaixz.bus.pager.dialect.AbstractPaging

afterAll, afterCount, afterPage, beforeCount, beforePage, getCountSql, getLocalPage, getPageSql, handleParameter, processParameterObject, setProperties, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.miaixz.bus.pager.Dialect

asyncCountTask, isAsyncCount

Constructor Details

Db2

public Db2()

Method Details

processPageParameter

public Object processPageParameter(org.apache.ibatis.mapping.MappedStatement ms,
 Map<String,Object> paramMap,
 Page page,
 org.apache.ibatis.mapping.BoundSql boundSql,
 org.apache.ibatis.cache.CacheKey pageKey)

Processes the pagination parameters for DB2. It adds PAGEPARAMETER_FIRST and PAGEPARAMETER_SECOND to the parameter map and updates the CacheKey.

Specified by:

processPageParameter in class AbstractPaging

Parameters:

ms - the MappedStatement object

paramMap - a map containing the query parameters

page - the Page object containing pagination details

boundSql - the BoundSql object for the query

pageKey - the CacheKey for the paginated query

Returns:

the processed parameter map

getPageSql

public String getPageSql(String sql,
 Page page,
 org.apache.ibatis.cache.CacheKey pageKey)

Generates the DB2-specific pagination SQL. It wraps the original SQL with a subquery that uses ROWNUMBER() OVER() to achieve pagination.

Specified by:

getPageSql in class AbstractPaging

Parameters:

sql - the original SQL string

page - the Page object containing pagination details

pageKey - the CacheKey for the paginated query

Returns:

the DB2-specific paginated SQL string