applicationContext.xml
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:/mybatis-config.xml" /> </bean>
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <!-- 设置成 true就可以启动缓存,一般的修改要1分钟才能生效(因为设置的flushInterval="60000" ) 如果是在一个xxxxMapper.xml里面修改的数据库的数据,就直接清空本mapper的缓存 --> <setting name="cacheEnabled" value="false"/> <setting name="useGeneratedKeys" value="false"/> </settings> <plugins> <plugin interceptor="com.system.util.DiclectStatementHandlerInterceptor" /> <plugin interceptor="com.system.util.DiclectResultSetHandlerInterceptor" /> </plugins> </configuration>
DiclectResultSetHandlerInterceptor.java
package com.system.util; import java.sql.Statement; import java.util.Properties; import org.apache.ibatis.executor.resultset.FastResultSetHandler; import org.apache.ibatis.executor.resultset.NestedResultSetHandler; import org.apache.ibatis.executor.resultset.ResultSetHandler; import org.apache.ibatis.plugin.Interceptor; import org.apache.ibatis.plugin.Intercepts; import org.apache.ibatis.plugin.Invocation; import org.apache.ibatis.plugin.Plugin; import org.apache.ibatis.plugin.Signature; import org.apache.ibatis.session.RowBounds; @Intercepts({ @Signature(type = ResultSetHandler.class, method = "handleResultSets", args = { Statement.class }) }) public class DiclectResultSetHandlerInterceptor implements Interceptor { public Object intercept(Invocation invocation) throws Throwable { FastResultSetHandler resultSet = (FastResultSetHandler) invocation.getTarget(); if(!(resultSet instanceof NestedResultSetHandler)) { RowBounds rowBounds = (RowBounds) ReflectUtil.getClassField(resultSet, "rowBounds"); if (rowBounds.getLimit() > 0 && rowBounds.getLimit() < RowBounds.NO_ROW_LIMIT) { ReflectUtil.setClassField(resultSet, "rowBounds", new RowBounds()); } } return invocation.proceed(); } public Object plugin(Object target) { return Plugin.wrap(target, this); } public void setProperties(Properties properties) { } }
DiclectStatementHandlerInterceptor.java
package com.system.util; import java.sql.Connection; import java.util.Properties; import org.apache.ibatis.executor.statement.PreparedStatementHandler; import org.apache.ibatis.executor.statement.RoutingStatementHandler; import org.apache.ibatis.executor.statement.StatementHandler; import org.apache.ibatis.mapping.BoundSql; import org.apache.ibatis.plugin.Interceptor; import org.apache.ibatis.plugin.Intercepts; import org.apache.ibatis.plugin.Invocation; import org.apache.ibatis.plugin.Plugin; import org.apache.ibatis.plugin.Signature; import org.apache.ibatis.session.RowBounds; @Intercepts( { @Signature(type = StatementHandler.class, method = "prepare", args = { Connection.class }) }) public class DiclectStatementHandlerInterceptor implements Interceptor { public Object intercept(Invocation invocation) throws Throwable { RoutingStatementHandler statement = (RoutingStatementHandler) invocation.getTarget(); StatementHandler handler = (StatementHandler) ReflectUtil.getClassField(statement, "delegate"); //PreparedStatementHandler handler = (PreparedStatementHandler) ReflectUtil.getClassField(statement, "delegate"); if (handler instanceof PreparedStatementHandler){ RowBounds rowBounds = (RowBounds) ReflectUtil.getSuperClassField(handler, "rowBounds"); if (rowBounds.getLimit() > 0 && rowBounds.getLimit() < RowBounds.NO_ROW_LIMIT) { BoundSql boundSql = statement.getBoundSql(); String sql = boundSql.getSql(); sql = getLimitString(sql, rowBounds.getOffset(), rowBounds.getLimit()); ReflectUtil.setClassField(boundSql, "sql", sql); } } return invocation.proceed(); } public Object plugin(Object target) { return Plugin.wrap(target, this); } public void setProperties(Properties properties) { } public String getLimitString(String sql, int offset, int limit) { limit = offset+limit; sql = sql.trim(); boolean isForUpdate = false; if ( sql.toLowerCase().endsWith(" for update") ) { sql = sql.substring( 0, sql.length()-11 ); isForUpdate = true; } StringBuffer pagingSelect = new StringBuffer( sql.length()+100 ); if (offset > 0) { pagingSelect.append("select * from ( select row_.*, rownum rownum_ from ( "); } else { pagingSelect.append("select * from ( "); } pagingSelect.append(sql); if (offset > 0) { pagingSelect.append(" ) row_ ) where rownum_ <= " + limit + " and rownum_ > " + offset); } else { pagingSelect.append(" ) where rownum <= " + limit); } if ( isForUpdate ) { pagingSelect.append( " for update" ); } return pagingSelect.toString(); } }
时间: 2024-10-12 15:30:08