MyBatis分页插件--有测试代码哦，可以抄袭哦
Posted ykzhen2015
tags:
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也许分页插件是你最为感兴趣的东西，那好我们开完成一个分页插件。
好长的代码，hold住哦。 博主今天累了，改天再和你们解释一下这个插件的设计思想。
package com.learn.mybatis.plugin;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Map;
import java.util.Properties;
import org.apache.ibatis.executor.parameter.ParameterHandler;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
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.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;
import org.apache.ibatis.scripting.defaults.DefaultParameterHandler;
import org.apache.ibatis.session.Configuration;
/**
*
* @author ykzhen2015
*/
@Intercepts({
@Signature(type = StatementHandler.class,
method = "prepare",
args = {Connection.class})})
public class PagingPlugin implements Interceptor {
private Integer defaultPage;
private Integer defaultPageSize;
private Boolean defaultUseFlag;
private Boolean defaultCheckFlag;
@Override
public Object intercept(Invocation invocation) throws Throwable {
StatementHandler stmtHandler = getUnProxyObject(invocation);
MetaObject metaStatementHandler = SystemMetaObject.forObject(stmtHandler);
String sql = (String) metaStatementHandler.getValue("delegate.boundSql.sql");
//不是select语句.
if (!this.checkSelect(sql)) {
return invocation.proceed();
}
BoundSql boundSql = (BoundSql) metaStatementHandler.getValue("delegate.boundSql");
Object parameterObject = boundSql.getParameterObject();
PageParams pageParams = null;
if (parameterObject instanceof Map) {
Map parameterMap = (Map) parameterObject;
pageParams = (PageParams) parameterMap.get("$pageParams");
} else if (parameterObject instanceof PageParams) {
pageParams = (PageParams) parameterObject;
}
if (pageParams == null) {
throw new Exception("没有获得分页参数！！，请正确使用分页参数！！");
}
//获取参数.
Integer pageNum = pageParams.getPage() == null? this.defaultPage : pageParams.getPage();
Integer pageSize = pageParams.getPageSize() == null? this.defaultPageSize : pageParams.getPageSize();
Boolean useFlag = pageParams.getUseFlag() == null? this.defaultUseFlag : pageParams.getUseFlag();
Boolean checkFlag = pageParams.getCheckFlag() == null? this.defaultCheckFlag : pageParams.getCheckFlag();
if (!useFlag) { //不使用分页插件.
return invocation.proceed();
}
int total = this.getTotal(invocation, metaStatementHandler, boundSql);
pageParams.setTotal(total);
//计算总页数.
int totalPage = total % pageSize == 0 ? total / pageSize : total / pageSize + 1;
pageParams.setTotalPage(totalPage);
//检查当前页码的有效性.
this.checkPage(checkFlag, pageNum, totalPage);
//修改sql
this.changeSQL(metaStatementHandler, boundSql, pageNum, pageSize);
//执行查询，得到最后的结果.
Object data = invocation.proceed();
// PageDataPO pageData = this.dealPageData(data, pageTotal, total, pageSize, pageNum);
return data;
}
/**
* 判断是否sql语句.
* @param sql
* @return
*/
private boolean checkSelect(String sql) {
String trimSql = sql.trim();
int idx = trimSql.toLowerCase().indexOf("select");
return idx == 0;
}
/**
* 检查当前页码的有效性.
* @param checkFlag
* @param pageNum
* @param pageTotal
* @throws Throwable
*/
private void checkPage(Boolean checkFlag, Integer pageNum, Integer pageTotal) throws Throwable {
if (checkFlag) {
//检查页码page是否合法.
if (pageNum > pageTotal) {
throw new Exception("查询失败，查询页码【" + pageNum + "】大于总页数【" + pageTotal + "】！！");
}
}
}
/**
* 修改当前查询的SQL
* @param metaStatementHandler
* @param boundSql
* @param page
* @param pageSize
*/
private void changeSQL(MetaObject metaStatementHandler, BoundSql boundSql, int page, int pageSize) {
//获取当前需要执行的SQL
String sql = (String) metaStatementHandler.getValue("delegate.boundSql.sql");
/**
* TODO 这里使用的是mysql其他数据库需要修改.
* 根据你的数据库，修改分页的SQL
*/
String newSql = "select * from (" + sql + ") $_paging_table limit " + (page - 1) * pageSize + ", " + pageSize;
//修改当前需要执行的SQL
metaStatementHandler.setValue("delegate.boundSql.sql", newSql);
}
/**
* 获取综述.
*
* @param ivt Invocation
* @param metaStatementHandler statementHandler
* @param boundSql sql
* @return sql查询总数.
* @throws Throwable 异常.
*/
private int getTotal(Invocation ivt, MetaObject metaStatementHandler, BoundSql boundSql) throws Throwable {
//获取当前的mappedStatement
MappedStatement mappedStatement = (MappedStatement) metaStatementHandler.getValue("delegate.mappedStatement");
//配置对象
Configuration cfg = mappedStatement.getConfiguration();
//当前需要执行的SQL
String sql = (String) metaStatementHandler.getValue("delegate.boundSql.sql");
/**
* TODO 如果是其他的数据库需要按你数据库的SQL规范改写.
* 改写为统计总数的SQL
*/
String countSql = "select count(*) as total from (" + sql + ") $_paging";
//获取拦截方法参数，我们知道是Connection对象.
Connection connection = (Connection) ivt.getArgs()[0];
PreparedStatement ps = null;
int total = 0;
try {
//预编译统计总数SQL
ps = connection.prepareStatement(countSql);
//构建统计总数SQL
BoundSql countBoundSql = new BoundSql(cfg, countSql, boundSql.getParameterMappings(), boundSql.getParameterObject());
//构建MyBatis的ParameterHandler用来设置总数Sql的参数。
ParameterHandler handler = new DefaultParameterHandler(mappedStatement, boundSql.getParameterObject(), countBoundSql);
//设置总数SQL参数
handler.setParameters(ps);
//执行查询.
ResultSet rs = ps.executeQuery();
while (rs.next()) {
total = rs.getInt("total");
}
} finally {
//这里不能关闭Connection否则后续的SQL就没法继续了。
if (ps != null && ps.isClosed()) {
ps.close();
}
}
System.err.println("总条数：" + total);
return total;
}
/**
* 从代理对象中分离出真实对象.
*
* @param ivt --Invocation
* @return 非代理StatementHandler对象
*/
private StatementHandler getUnProxyObject(Invocation ivt) {
StatementHandler statementHandler = (StatementHandler) ivt.getTarget();
MetaObject metaStatementHandler = SystemMetaObject.forObject(statementHandler);
// 分离代理对象链(由于目标类可能被多个拦截器拦截，从而形成多次代理，通过循环可以分离出最原始的的目标类)
Object object = null;
while (metaStatementHandler.hasGetter("h")) {
object = metaStatementHandler.getValue("h");
}
if (object == null) {
return statementHandler;
}
return (StatementHandler) object;
}
@Override
public Object plugin(Object statementHandler) {
return Plugin.wrap(statementHandler, this);
}
@Override
public void setProperties(Properties props) {
String strDefaultPage = props.getProperty("default.page", "1");
String strDefaultPageSize = props.getProperty("default.pageSize", "50");
String strDefaultUseFlag = props.getProperty("default.useFlag", "false");
String strDefaultCheckFlag = props.getProperty("default.checkFlag", "false");
this.defaultPage = Integer.parseInt(strDefaultPage);
this.defaultPageSize = Integer.parseInt(strDefaultPageSize);
this.defaultUseFlag = Boolean.parseBoolean(strDefaultUseFlag);
this.defaultCheckFlag = Boolean.parseBoolean(strDefaultCheckFlag);
}
}
注意：在代码注解的地方有些地方有TODO,这里我采用的是MySQL修改语句，如果你是其他数据库需要在哪里修改为对应数据库的SQL语句。
有了这个插件，还不行哦，还要配置一下：
<plugins> <plugin interceptor="com.learn.mybatis.plugin.PagingPlugin"> <!--默认第1页--> <property name="default.page" value="1" /> <!--默认每页20条--> <property name="default.pageSize" value="20" /> <!--默认不启用分页插件--> <property name="default.useFlag" value="false" /> <!--默认不检查页码--> <property name="default.checkFlag" value="false" /> </plugin> </plugins>
这样在MyBatis上下文就可以引用这个插件了。
这里的配置：
- default.page -- 缺省页码的时候，采用第1页
- default.pageSize -- 缺省每页多少条配置的时候，才有每页20条
- default.useFlag -- 查询是否启用分页插件，如果为false则不启用。
- default.checkFlag -- 查询是否检查page当前页有效。如最大页码是2，程序传递为3，如此项为true，则抛出异常提示错误。如果为false则不抛出异常
以上的默认参数都可以通过这个类进行改变：
package com.learn.mybatis.plugin;
/**
*
* @author ykzhen2015
*/
public class PageParams {
private Integer page;
private Integer pageSize;
private Boolean useFlag;
private Boolean checkFlag;
private Integer total;
private Integer totalPage;
public Integer getPage() {
return page;
}
public void setPage(Integer page) {
this.page = page;
}
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
public Boolean getUseFlag() {
return useFlag;
}
public void setUseFlag(Boolean useFlag) {
this.useFlag = useFlag;
}
public Boolean getCheckFlag() {
return checkFlag;
}
public void setCheckFlag(Boolean checkFlag) {
this.checkFlag = checkFlag;
}
public Integer getTotal() {
return total;
}
public void setTotal(Integer total) {
this.total = total;
}
public Integer getTotalPage() {
return totalPage;
}
public void setTotalPage(Integer totalPage) {
this.totalPage = totalPage;
}
}
当以下属性被设置会有这样的效果：
- page --插件默认设置default.page作废，采取这个值
pageSize --插件默认设置default.pageSize作废，采取这个值
useFlag --插件默认设置default.useFlag作废，采取这个值
checkFlag --插件默认设置default.checkFlag作废，采取这个值
而：
total ——代表总条数，插件回自动帮我们回填
totalPage ——代表总页数，插件回自动帮我们回填
有了这个类，我们来举例如何使用它，我们先定义Mapper接口。
package com.learn.mybatis.chapter1.mapper;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.Param;
import com.learn.mybatis.chapter1.po.TRole;
import com.learn.mybatis.plugin.PageParams;
import com.learn.mybatis.plugin.TestParams;
public interface RoleMapper {
public TRole getRole(Long id);
public List<TRole> selectAllRole(TestParams pageParams);
public List<TRole> selectRoleByMap(Map<String, Object> params);
//"$pageParams"这个键不能修改
public List<TRole> selectRoleByMap(@Param("roleName") String roleName, @Param("$pageParams") PageParams pageParams);
}
好，这里有三个select开头的方法，参数分别为POJO, map和MyBatis的注解型。这三种类型这个插件都可以适用。
让我们看看POJO---TestParams,它继承了PageParams
package com.learn.mybatis.plugin;
public class TestParams extends PageParams {
String roleName;
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
}
这时候我们看看roleMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.learn.mybatis.chapter1.mapper.RoleMapper">
<select id="getRole" parameterType="long" resultType="com.learn.mybatis.chapter1.po.TRole">
select id, role_name as roleName, note from t_role where id=#{id}
</select>
<select id="selectAllRole" parameterType="com.learn.mybatis.plugin.TestParams" resultType="com.learn.mybatis.chapter1.po.TRole">
select id, role_name as roleName, note from t_role
<where>
<if test="roleName != null">
role_name like concat('%', #{roleName}, '%')
</if>
</where>
</select>
<select id="selectRoleByMap" parameterType="map" resultType="com.learn.mybatis.chapter1.po.TRole">
select id, role_name as roleName, note from t_role
<where>
<if test="roleName != null">
role_name like concat('%', #{roleName}, '%')
</if>
</where>
</select>
<select id="selectRoleByKey" resultType="com.learn.mybatis.chapter1.po.TRole">
select id, role_name as roleName, note from t_role
<where>
<if test="roleName != null">
role_name like concat('%', #{roleName}, '%')
</if>
</where>
</select>
</mapper>可以看好，三个select都有方法了。
我们用main方法测试一下：
public static void main(String[] args) {
testParams();
testPOJO();
testMap();
}
public static void testPOJO() {
SqlSession sqlSession = null;
try {
sqlSession = MyBatisUtil.getSqlSessionFactroy().openSession();
RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);
TestParams params = new TestParams();
params.setUseFlag(true);
params.setCheckFlag(false);
params.setPage(2);
params.setPageSize(5);
params.setRoleName("test");
List<TRole> pageData = roleMapper.selectAllRole(params);
System.err.println("#######################测试POJO##################");
System.err.println("总页数：" + params.getTotalPage());
System.err.println("总条数：" + params.getTotal());
} finally {
sqlSession.close();
}
}
public static void testMap() {
SqlSession sqlSession = null;
try {
sqlSession = MyBatisUtil.getSqlSessionFactroy().openSession();
RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);
Map<String, Object> paramMap = new HashMap<String, Object>();
PageParams pageParams = new PageParams();
pageParams.setUseFlag(true);
pageParams.setCheckFlag(false);
pageParams.setPage(2);
pageParams.setPageSize(5);
paramMap.put("roleName", "test");
paramMap.put("$pageParams", pageParams);//"$pageParams"这个键不能修改
List<TRole> pageData2 = roleMapper.selectRoleByMap(paramMap);
System.err.println("#######################测试Map##################");
System.err.println("总页数：" + pageParams.getTotalPage());
System.err.println("总条数：" + pageParams.getTotal());
} finally {
sqlSession.close();
}
}
public static void testParams() {
SqlSession sqlSession = null;
try {
sqlSession = MyBatisUtil.getSqlSessionFactroy().openSession();
RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);
PageParams pageParams2 = new PageParams();
pageParams2.setUseFlag(true);
pageParams2.setCheckFlag(true);
pageParams2.setPage(2);
pageParams2.setPageSize(5);
List<TRole> pageData3 = roleMapper.selectRoleByMap("test", pageParams2);
System.err.println("#######################测试@Param##################");
System.err.println("总页数：" + pageParams2.getTotalPage());
System.err.println("总条数：" + pageParams2.getTotal());
} finally {
sqlSession.close();
}
}好，他们都执行相同的查询，并且打印了总页数和总条数，会不会成功呢？我们看看打印的日志：
run: DEBUG 2016-06-16 21:03:46,208 org.apache.ibatis.logging.LogFactory: Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter. DEBUG 2016-06-16 21:03:46,818 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:03:46,834 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:03:46,834 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:03:46,834 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:03:47,583 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Opening JDBC Connection DEBUG 2016-06-16 21:03:48,646 org.apache.ibatis.datasource.pooled.PooledDataSource: Created connection 2042495840. DEBUG 2016-06-16 21:03:48,646 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Setting autocommit to false on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:48,662 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Preparing: select count(*) as total from (select id, role_name as roleName, note from t_role WHERE role_name like concat('%', ?, '%')) $_paging DEBUG 2016-06-16 21:03:48,802 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Parameters: test(String) DEBUG 2016-06-16 21:03:48,896 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: <== Total: 1 总条数：11 DEBUG 2016-06-16 21:03:48,896 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Preparing: select * from (select id, role_name as roleName, note from t_role WHERE role_name like concat('%', ?, '%')) $_paging_table limit 5, 5 DEBUG 2016-06-16 21:03:48,912 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Parameters: test(String) DEBUG 2016-06-16 21:03:48,927 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: <== Total: 5 #######################测试@Param################## 总页数：3 总条数：11 DEBUG 2016-06-16 21:03:48,927 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Resetting autocommit to true on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:48,927 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Closing JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:48,943 org.apache.ibatis.datasource.pooled.PooledDataSource: Returned connection 2042495840 to pool. DEBUG 2016-06-16 21:03:48,943 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Opening JDBC Connection DEBUG 2016-06-16 21:03:48,943 org.apache.ibatis.datasource.pooled.PooledDataSource: Checked out connection 2042495840 from pool. DEBUG 2016-06-16 21:03:48,943 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Setting autocommit to false on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:48,943 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Preparing: select count(*) as total from (select id, role_name as roleName, note from t_role WHERE role_name like concat('%', ?, '%')) $_paging DEBUG 2016-06-16 21:03:48,958 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Parameters: test(String) DEBUG 2016-06-16 21:03:48,958 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: <== Total: 1 总条数：11 DEBUG 2016-06-16 21:03:48,958 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Preparing: select * from (select id, role_name as roleName, note from t_role WHERE role_name like concat('%', ?, '%')) $_paging_table limit 5, 5 DEBUG 2016-06-16 21:03:48,958 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Parameters: test(String) DEBUG 2016-06-16 21:03:48,974 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: <== Total: 5 #######################测试POJO################## 总页数：3 总条数：11 DEBUG 2016-06-16 21:03:48,974 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Resetting autocommit to true on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:48,974 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Closing JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:48,974 org.apache.ibatis.datasource.pooled.PooledDataSource: Returned connection 2042495840 to pool. DEBUG 2016-06-16 21:03:48,974 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Opening JDBC Connection DEBUG 2016-06-16 21:03:48,974 org.apache.ibatis.datasource.pooled.PooledDataSource: Checked out connection 2042495840 from pool. DEBUG 2016-06-16 21:03:48,974 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Setting autocommit to false on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:48,990 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Preparing: select count(*) as total from (select id, role_name as roleName, note from t_role WHERE role_name like concat('%', ?, '%')) $_paging DEBUG 2016-06-16 21:03:48,990 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Parameters: test(String) 总条数：11 DEBUG 2016-06-16 21:03:48,990 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: <== Total: 1 DEBUG 2016-06-16 21:03:48,990 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Preparing: select * from (select id, role_name as roleName, note from t_role WHERE role_name like concat('%', ?, '%')) $_paging_table limit 5, 5 DEBUG 2016-06-16 21:03:48,990 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Parameters: test(String) DEBUG 2016-06-16 21:03:49,005 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: <== Total: 5 #######################测试Map################## 总页数：3 总条数：11 DEBUG 2016-06-16 21:03:49,005 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Resetting autocommit to true on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:49,005 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Closing JDBC Connection [[email protected]] DEBUG 2016-06-16 21:03:49,005 org.apache.ibatis.datasource.pooled.PooledDataSource: Returned connection 2042495840 to pool. 成功构建 (总时间: 5 秒)
好，我们看到，我们的分页参数的总条数和总页数被回填了。而且我们可以通过useFlag属性来控制是否启用分页，这样对于select count(*) from t_role这样的语句我们通过设置参数，就可以不启用这个分页功能了。
此外还有检查页码的功能，只要设置了属性，checkFlag插件会为我们检查这个页码的正确性，让我们看看：
public static void testException() {
SqlSession sqlSession = null;
try {
sqlSession = MyBatisUtil.getSqlSessionFactroy().openSession();
RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);
TestParams params = new TestParams();
params.setUseFlag(true);
params.setCheckFlag(true);//检查页码正确性
params.setPage(5);//故意超过最大页数
params.setPageSize(5);
params.setRoleName("test");
List<TRole> pageData = roleMapper.selectAllRole(params);
System.err.println("#######################测试POJO##################");
System.err.println("总页数：" + params.getTotalPage());
System.err.println("总条数：" + params.getTotal());
} finally {
sqlSession.close();
}
}params.setCheckFlag(true);//检查页码正确性
注意这里设置了需要检验
params.setPage(5);//故意超过最大页数
这样让他超过了最大的页数。
我们测试它，得到日志：
run: DEBUG 2016-06-16 21:09:22,123 org.apache.ibatis.logging.LogFactory: Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter. DEBUG 2016-06-16 21:09:22,341 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:09:22,341 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:09:22,341 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:09:22,341 org.apache.ibatis.datasource.pooled.PooledDataSource: PooledDataSource forcefully closed/removed all connections. DEBUG 2016-06-16 21:09:22,732 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Opening JDBC Connection DEBUG 2016-06-16 21:09:23,482 org.apache.ibatis.datasource.pooled.PooledDataSource: Created connection 1033490990. DEBUG 2016-06-16 21:09:23,482 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Setting autocommit to false on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:09:23,513 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Preparing: select count(*) as total from (select id, role_name as roleName, note from t_role WHERE role_name like concat('%', ?, '%')) $_paging DEBUG 2016-06-16 21:09:23,669 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: ==> Parameters: test(String) DEBUG 2016-06-16 21:09:23,794 org.apache.ibatis.logging.jdbc.BaseJdbcLogger: <== Total: 1 总条数：11 DEBUG 2016-06-16 21:09:23,810 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Resetting autocommit to true on JDBC Connection [[email protected]] DEBUG 2016-06-16 21:09:23,810 org.apache.ibatis.transaction.jdbc.JdbcTransaction: Closing JDBC Connection [[email protected]] DEBUG 2016-06-16 21:09:23,826 org.apache.ibatis.datasource.pooled.PooledDataSource: Returned connection 1033490990 to pool. Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.lang.reflect.UndeclaredThrowableException ### The error may exist in com\learn\mybatis\chapter1\sqlmap\role.xml ### The error may involve com.learn.mybatis.chapter1.mapper.RoleMapper.selectAllRole-Inline ### The error occurred while setting parameters ### Cause: java.lang.reflect.UndeclaredThrowableException at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:122) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113) at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:122) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:64) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53) at com.sun.proxy.$Proxy3.selectAllRole(Unknown Source) at com.learn.mybatis.chapter1.main.MyBatisExample.testException(MyBatisExample.java:33) at com.learn.mybatis.chapter1.main.MyBatisExample.main(MyBatisExample.java:18) Caused by: java.lang.reflect.UndeclaredThrowableException at com.sun.proxy.$Proxy4.prepare(Unknown Source) at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:76) at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:61) at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:303) at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:154) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:102) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:82) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120) ... 7 more Caused by: java.lang.Exception: 查询失败，查询页码【5】大于总页数【3】！！ at com.learn.mybatis.plugin.PagingPlugin.checkPage(PagingPlugin.java:105) at com.learn.mybatis.plugin.PagingPlugin.intercept(PagingPlugin.java:73) at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61) ... 15 more C:\Users\ykzhen\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1 构建失败 (总时间: 2 秒)
我们看到了，异常，并且指明超过了最大总页数
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