本篇文章为大家展示了MyBatis中怎么自定义typeHandler，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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>
<h3>Hello World!</h3>
<%
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.
上述内容就是MyBatis中怎么自定义typeHandler，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。
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