com.baomidou.mybatisplus.extension.plugins.inner

类 PaginationInnerInterceptor

java.lang.Object

com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor

所有已实现的接口:

InnerInterceptor

public class PaginationInnerInterceptor
extends java.lang.Object
implements InnerInterceptor

分页拦截器

默认对 left join 进行优化,虽然能优化count,但是加上分页的话如果1对多本身结果条数就是不正确的

从以下版本开始:

3.4.0

作者:

hubin

字段概要

字段

限定符和类型	字段和说明
protected static java.util.List<net.sf.jsqlparser.statement.select.SelectItem>	COUNT_SELECT_ITEM
protected static java.util.Map<java.lang.String,org.apache.ibatis.mapping.MappedStatement>	countMsCache
protected org.apache.ibatis.logging.Log	logger
protected java.lang.Long	maxLimit 单页分页条数限制
protected boolean	overflow 溢出总页数后是否进行处理

构造器概要

构造器

构造器和说明
PaginationInnerInterceptor(com.baomidou.mybatisplus.annotation.DbType dbType)
PaginationInnerInterceptor(IDialect dialect)

方法概要

限定符和类型	方法和说明
protected java.util.List<net.sf.jsqlparser.statement.select.OrderByElement>	addOrderByElements(java.util.List<com.baomidou.mybatisplus.core.metadata.OrderItem> orderList, java.util.List<net.sf.jsqlparser.statement.select.OrderByElement> orderByElements)
protected java.lang.String	autoCountSql(boolean optimizeCountSql, java.lang.String sql) 获取自动优化的 countSql
void	beforeQuery(org.apache.ibatis.executor.Executor executor, org.apache.ibatis.mapping.MappedStatement ms, java.lang.Object parameter, org.apache.ibatis.session.RowBounds rowBounds, org.apache.ibatis.session.ResultHandler resultHandler, org.apache.ibatis.mapping.BoundSql boundSql) Executor.query(MappedStatement, Object, RowBounds, ResultHandler, CacheKey, BoundSql) 操作前置处理 改改sql啥的
protected org.apache.ibatis.mapping.MappedStatement	buildAutoCountMappedStatement(org.apache.ibatis.mapping.MappedStatement ms) 构建 mp 自用自动的 MappedStatement
protected org.apache.ibatis.mapping.MappedStatement	buildCountMappedStatement(org.apache.ibatis.mapping.MappedStatement ms, java.lang.String countId) 获取指定的 id 的 MappedStatement
protected java.lang.String	concatOrderBy(java.lang.String originalSql, java.util.List<com.baomidou.mybatisplus.core.metadata.OrderItem> orderList) 查询SQL拼接Order By
protected boolean	continuePage(com.baomidou.mybatisplus.core.metadata.IPage<?> page) count 查询之后,是否继续执行分页
protected IDialect	findIDialect(org.apache.ibatis.executor.Executor executor) 获取分页方言类的逻辑
protected void	handlerLimit(com.baomidou.mybatisplus.core.metadata.IPage<?> page) 处理超出分页条数限制,默认归为限制数
protected void	handlerOverflow(com.baomidou.mybatisplus.core.metadata.IPage<?> page) 处理页数溢出,默认设置为第一页
protected java.lang.String	lowLevelCountSql(java.lang.String originalSql) 无法进行count优化时,降级使用此方法
void	setProperties(java.util.Properties properties)
boolean	willDoQuery(org.apache.ibatis.executor.Executor executor, org.apache.ibatis.mapping.MappedStatement ms, java.lang.Object parameter, org.apache.ibatis.session.RowBounds rowBounds, org.apache.ibatis.session.ResultHandler resultHandler, org.apache.ibatis.mapping.BoundSql boundSql) 这里进行count,如果count为0这返回false(就是不再执行sql了)

从类继承的方法 java.lang.Object

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

从接口继承的方法 com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor

beforePrepare, beforeUpdate, willDoUpdate

字段详细资料

COUNT_SELECT_ITEM

protected static final java.util.List<net.sf.jsqlparser.statement.select.SelectItem> COUNT_SELECT_ITEM

countMsCache

protected static final java.util.Map<java.lang.String,org.apache.ibatis.mapping.MappedStatement> countMsCache

logger

protected final org.apache.ibatis.logging.Log logger

overflow

protected boolean overflow

溢出总页数后是否进行处理

maxLimit

protected java.lang.Long maxLimit

单页分页条数限制

构造器详细资料

PaginationInnerInterceptor

public PaginationInnerInterceptor(com.baomidou.mybatisplus.annotation.DbType dbType)

PaginationInnerInterceptor

public PaginationInnerInterceptor(IDialect dialect)

方法详细资料

willDoQuery

public boolean willDoQuery(org.apache.ibatis.executor.Executor executor,
                           org.apache.ibatis.mapping.MappedStatement ms,
                           java.lang.Object parameter,
                           org.apache.ibatis.session.RowBounds rowBounds,
                           org.apache.ibatis.session.ResultHandler resultHandler,
                           org.apache.ibatis.mapping.BoundSql boundSql)
                    throws java.sql.SQLException

这里进行count,如果count为0这返回false(就是不再执行sql了)

指定者:

willDoQuery 在接口中 InnerInterceptor

参数:

executor - Executor(可能是代理对象)

ms - MappedStatement

parameter - parameter

rowBounds - rowBounds

resultHandler - resultHandler

boundSql - boundSql

返回:

新的 boundSql

抛出:

java.sql.SQLException

beforeQuery

public void beforeQuery(org.apache.ibatis.executor.Executor executor,
                        org.apache.ibatis.mapping.MappedStatement ms,
                        java.lang.Object parameter,
                        org.apache.ibatis.session.RowBounds rowBounds,
                        org.apache.ibatis.session.ResultHandler resultHandler,
                        org.apache.ibatis.mapping.BoundSql boundSql)
                 throws java.sql.SQLException

从接口复制的说明: InnerInterceptor

Executor.query(MappedStatement, Object, RowBounds, ResultHandler, CacheKey, BoundSql) 操作前置处理

改改sql啥的

指定者:

beforeQuery 在接口中 InnerInterceptor

参数:

executor - Executor(可能是代理对象)

ms - MappedStatement

parameter - parameter

rowBounds - rowBounds

resultHandler - resultHandler

boundSql - boundSql

抛出:

java.sql.SQLException

findIDialect

protected IDialect findIDialect(org.apache.ibatis.executor.Executor executor)

获取分页方言类的逻辑

参数:

executor - Executor

返回:

分页方言类

buildCountMappedStatement

protected org.apache.ibatis.mapping.MappedStatement buildCountMappedStatement(org.apache.ibatis.mapping.MappedStatement ms,
                                                                              java.lang.String countId)

获取指定的 id 的 MappedStatement

参数:

ms - MappedStatement

countId - id

返回:

MappedStatement

buildAutoCountMappedStatement

protected org.apache.ibatis.mapping.MappedStatement buildAutoCountMappedStatement(org.apache.ibatis.mapping.MappedStatement ms)

构建 mp 自用自动的 MappedStatement

参数:

ms - MappedStatement

返回:

MappedStatement

autoCountSql

protected java.lang.String autoCountSql(boolean optimizeCountSql,
                                        java.lang.String sql)

获取自动优化的 countSql

参数:

optimizeCountSql - 是否进行优化

sql - sql

返回:

countSql

lowLevelCountSql

protected java.lang.String lowLevelCountSql(java.lang.String originalSql)

无法进行count优化时,降级使用此方法

参数:

originalSql - 原始sql

返回:

countSql

concatOrderBy

protected java.lang.String concatOrderBy(java.lang.String originalSql,
                                         java.util.List<com.baomidou.mybatisplus.core.metadata.OrderItem> orderList)

查询SQL拼接Order By

参数:

originalSql - 需要拼接的SQL

返回:

ignore

addOrderByElements

protected java.util.List<net.sf.jsqlparser.statement.select.OrderByElement> addOrderByElements(java.util.List<com.baomidou.mybatisplus.core.metadata.OrderItem> orderList,
                                                                                               java.util.List<net.sf.jsqlparser.statement.select.OrderByElement> orderByElements)

continuePage

protected boolean continuePage(com.baomidou.mybatisplus.core.metadata.IPage<?> page)

count 查询之后,是否继续执行分页

参数:

page - 分页对象

返回:

是否

handlerLimit

protected void handlerLimit(com.baomidou.mybatisplus.core.metadata.IPage<?> page)

处理超出分页条数限制,默认归为限制数

参数:

page - IPage

handlerOverflow

protected void handlerOverflow(com.baomidou.mybatisplus.core.metadata.IPage<?> page)

处理页数溢出,默认设置为第一页

参数:

page - IPage

setProperties

public void setProperties(java.util.Properties properties)

指定者:

setProperties 在接口中 InnerInterceptor