Module bus.pager

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

Class PostgreSql

java.lang.Object

org.miaixz.bus.pager.dialect.AbstractDialect

org.miaixz.bus.pager.dialect.AbstractPaging

org.miaixz.bus.pager.dialect.base.PostgreSql

All Implemented Interfaces:

Dialect

public class PostgreSql
extends AbstractPaging

Database dialect for PostgreSQL. This class provides PostgreSQL-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
PostgreSql()

Method Summary

Modifier and Type	Method	Description
String	getPageSql(String sql, Page page, org.apache.ibatis.cache.CacheKey pageKey)	Generates the PostgreSQL-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 PostgreSQL.

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

PostgreSql

public PostgreSql()

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 PostgreSQL. It adds PAGEPARAMETER_SECOND (limit) and PAGEPARAMETER_FIRST (offset) to the parameter map and updates the CacheKey. It also modifies the BoundSql's parameter mappings to include these pagination parameters.

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 PostgreSQL-specific pagination SQL. It appends LIMIT ? or LIMIT ? OFFSET ? to the original SQL.

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 PostgreSQL-specific paginated SQL string

See Also:

• PostgreSQL LIMIT Clause