MyBatis自定义typeHandler的完整实例

唐伯虎

自定义typehandler
对于自定义typehandler来说,需要在配置文件中注册typehandlers 然后需要实现typehandler接口,
一个例子
首先编写调度的处理类

package com.ming.mybatis;
 
 
import org.apache.ibatis.type.jdbctype;
import org.apache.ibatis.type.typehandler;
import org.apache.logging.log4j.logmanager;
import org.apache.logging.log4j.logger;
 
import java.sql.callablestatement;
import java.sql.preparedstatement;
import java.sql.resultset;
import java.sql.sqlexception;
 
public class stringtypehandler implements typehandler<string> {
 private static logger logger = logmanager.getlogger();
 
 /**
  * 对预编译的sql语句进行设置的时候,
  * @param ps
  * @param i
  * @param parameter
  * @param jdbctype
  * @throws sqlexception
  */
 @override
 public void setparameter(preparedstatement ps, int i, string parameter, jdbctype jdbctype) throws sqlexception {
  logger.info("使用typehandler");
  // 设置预编译的sql对象,的string
  ps.setstring(i, parameter);
 }
 
 /**
  * 获得结果的时候,获取到列名的时候,调度此方法
  * @param rs
  * @param columnname
  * @return
  * @throws sqlexception
  */
 @override
 public string getresult(resultset rs, string columnname) throws sqlexception {
  logger.info("使用自定义类型,结果获取列名字符串");
  return rs.getstring(columnname);
 }
 
 /**
  * 获取结果集中的index
  * @param rs
  * @param columnindex
  * @return
  * @throws sqlexception
  */
 @override
 public string getresult(resultset rs, int columnindex) throws sqlexception {
  logger.info("在结果集中获取columnindex");
  return rs.getstring(columnindex);
 }
 
 /**
  * 获取结果集中的下标对应的字符串
  * @param cs
  * @param columnindex
  * @return
  * @throws sqlexception
  */
 @override
 public string getresult(callablestatement cs, int columnindex) throws sqlexception {
  logger.info("结果集中,下标获取到字符串");
  return cs.getstring(columnindex);
 }
}

再次编写配置文件

<typehandlers>
 <typehandler jdbctype="varchar" javatype="string" handler="com.ming.mybatis.stringtypehandler">
 </typehandlers>

传入数据库的为的varchar类型,javatype类型为string类型,调度的类为com.ming.mybatis.stringtypehandler
修改映射文件,说明那些需要对结果进行修改

<?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">
<!-- 定义接口类 -->
<mapper namespace="com.ming.mybatis.pojo.rolemapper">
 <!-- id表示标签标识 type标识结果的返回类型,其中role为在配置文件中使用的别名 role类 -->
 <resultmap type="role" id="rolemap">
 <!-- id为主键映射关系 其中数据库中的id为主键 -->
 <id column="id" property="id" javatype="int" jdbctype="integer"/>
 <!-- result为其他基本数据类型和实体类之间的映射 映射关系为role_name 到 rolename之间的映射 数据类型为string到varchar之间的映射关系 -->
 <result column="role_name" property="rolename" javatype="string" jdbctype="varchar"/>
 <!-- 这里使用typehandler表示遇到此处理集的时候,将会执行com.ming.mybatis.stringtypehandler -->
 <result column="note" property="note" typehandler="com.ming.mybatis.stringtypehandler"/>
 </resultmap>
 
 <!-- 书写sql语句 定义使用resultmap为rolemap-->
 <select id="getrole" parametertype="int" resultmap="rolemap">
 select id, role_name, note from t_role4 where id = #{id}
 </select>
 
</mapper>

其中传入的参数为int类型,由于结果中mybatis没有int类型,对应的是integer类型,在mysql中两者类型相同,所以修改如上所示,表类型

书写index.jsp

<%@ page import="org.apache.ibatis.session.sqlsession" %>
<%@ page import="com.ming.util.sqlsessionfactoryutil" %>
<%@ page import="com.ming.mybatis.pojo.rolemapper" %>
<%@ page import="com.ming.mybatis.pojo.role" %>
<html>
<body>
<h2>hello world!</h2>
 
<%
  long starttime = system.currenttimemillis(); //获取开始时间
  sqlsession sqlsession = null;
  role role = null;
  for(int i = 0; i < 10; i++) {
  try {
    sqlsession = sqlsessionfactoryutil.opensqlsesion();
    rolemapper rolemapper = sqlsession.getmapper(rolemapper.class);
    role = rolemapper.getrole(100);
    sqlsession.commit();
  } catch (exception e) {
    e.printstacktrace();
    sqlsession.rollback();
  } finally {
    if (sqlsession != null) {
    sqlsession.close();
    }
  }
  }
  long endtime = system.currenttimemillis(); //获取结束时间
 
%>
<%=role.getnote()%>
</body>
</html>

已经查询成功

查看日志文件,日志文件已经输出相关信息

2019-04-13 05:03:33.181 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:33.181 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:33.182 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.235 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:33.236 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:33.275 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.276 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.277 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:33.277 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.312 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.312 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:33.313 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:33.314 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:33.314 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.346 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:33.348 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:33.386 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.390 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.391 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:33.395 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.442 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.443 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:33.443 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:33.444 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:33.444 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.479 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:33.480 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:33.518 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.519 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.520 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:33.520 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.556 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.557 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:33.558 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:33.558 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:33.558 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.591 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:33.592 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:33.638 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.639 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.640 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:33.640 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.676 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.677 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:33.677 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:33.677 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:33.677 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.711 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:33.712 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:33.747 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.748 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.748 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:33.749 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.780 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.780 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:33.781 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:33.781 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:33.781 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.830 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:33.831 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:33.868 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.870 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.870 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:33.872 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.913 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.914 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:33.914 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:33.915 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:33.915 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:33.956 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:33.957 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:33.994 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.994 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:33.995 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:33.995 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.029 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.029 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:34.030 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:34.030 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:34.030 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.095 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:34.097 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:34.133 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:34.133 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:34.134 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:34.134 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.168 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.169 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:34.170 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:34.170 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:34.171 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.214 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:34.215 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:34.252 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:34.252 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:34.253 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:34.254 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.291 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.291 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.
2019-04-13 05:03:34.292 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.openconnection(jdbctransaction.java:136) - opening jdbc connection
2019-04-13 05:03:34.292 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.popconnection(pooleddatasource.java:397) - checked out connection 197673257 from pool.
2019-04-13 05:03:34.292 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.setdesiredautocommit(jdbctransaction.java:100) - setting autocommit to false on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.336 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> preparing: select id, role_name, note from t_role4 where id = ? 
2019-04-13 05:03:34.337 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - ==> parameters: 100(integer)
2019-04-13 05:03:34.379 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:34.380 [info ] com.ming.mybatis.stringtypehandler.getresult(stringtypehandler.java:48) - 使用自定义类型,结果获取列名字符串
2019-04-13 05:03:34.380 [debug] org.apache.ibatis.logging.jdbc.basejdbclogger.debug(basejdbclogger.java:143) - <==   total: 1
2019-04-13 05:03:34.381 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.resetautocommit(jdbctransaction.java:122) - resetting autocommit to true on jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.415 [debug] org.apache.ibatis.transaction.jdbc.jdbctransaction.close(jdbctransaction.java:90) - closing jdbc connection [com.mysql.cj.jdbc.connectionimpl@bc84129]
2019-04-13 05:03:34.415 [debug] org.apache.ibatis.datasource.pooled.pooleddatasource.pushconnection(pooleddatasource.java:362) - returned connection 197673257 to pool.

ps 类型转换的问题
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对CodeAE代码之家的支持。
原文链接：https://www.iming.info/mybatis-zi-ding-yi-typehandler/

[Java] MyBatis自定义typeHandler的完整实例

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