1

src/main/java/com/liukai/demo/Main.java

+package com.liukai.demo;
+
+import org.apache.ibatis.io.Resources;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * @author liukai
+ * @Description: TODO
+ * @date 2020/2/254:41 下午
+ */
+public class Main {
+    public static void main(String[] args) {
+        String resource="mybatis-config.xml";
+        InputStream inputStream=null;
+        try {
+            inputStream = Resources.getResourceAsStream(resource);
+        } catch (IOException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+        SqlSessionFactory sqlSessionFactory=null;
+        sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession=null;
+        try {
+            sqlSession=sqlSessionFactory.openSession();
+            RoleMapper roleMapper=sqlSession.getMapper(RoleMapper.class);
+            Role role=roleMapper.getRole(1L);
+            System.out.println(role.getId()+":"+role.getRoleName()+":"+role.getNote());
+            sqlSession.commit();
+
+        } catch (Exception e) {
+            // TODO Auto-generated catch block
+            sqlSession.rollback();
+            e.printStackTrace();
+        }finally {
+            sqlSession.close();
+        }
+    }
+}

src/main/java/com/liukai/demo/MyStringHandler.java

+package com.liukai.demo;
+
+import org.apache.ibatis.type.JdbcType;
+import org.apache.ibatis.type.MappedJdbcTypes;
+import org.apache.ibatis.type.MappedTypes;
+import org.apache.ibatis.type.TypeHandler;
+import org.apache.log4j.Logger;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+/**
+ * @author liukai
+ * @Description: TODO
+ * @date 2020/2/254:41 下午
+ */
+@MappedTypes({String.class})
+@MappedJdbcTypes(JdbcType.VARCHAR)
+public class MyStringHandler implements TypeHandler<String> {
+
+
+    private Logger log=Logger.getLogger(MyStringHandler.class);
+
+    @Override
+    public String getResult(ResultSet rs, String colName) throws SQLException {
+        log.info("使用我的TypeHandler,ResultSet列名获取字符串");
+        return rs.getString(colName);
+    }
+
+    @Override
+    public String getResult(ResultSet rs, int index) throws SQLException {
+        log.info("使用我的TypeHandler,ResultSet下标获取字符串");
+        return rs.getString(index);
+    }
+
+    @Override
+    public String getResult(CallableStatement cs, int index) throws SQLException {
+        log.info("使用我的TypeHandler,CallableStatement下标获取字符串");
+        return cs.getString(index);
+    }
+
+    @Override
+    public void setParameter(PreparedStatement ps, int index, String value, JdbcType arg3) throws SQLException {
+        log.info("使用我的TypeHandler");
+        ps.setString(index, value);
+    }
+
+}

src/main/java/com/liukai/demo/Role.java

+package com.liukai.demo;
+
+/**
+ * @author liukai
+ * @Description: TODO
+ * @date 2020/2/254:44 下午
+ */
+public class Role {
+    private long id;
+    private String roleName;
+    private String note;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getRoleName() {
+        return roleName;
+    }
+
+    public void setRoleName(String roleName) {
+        this.roleName = roleName;
+    }
+
+    public String getNote() {
+        return note;
+    }
+
+    public void setNote(String note) {
+        this.note = note;
+    }
+}

src/main/java/com/liukai/demo/RoleMapper.java

+package com.liukai.demo;
+
+/*
+ * @author gethin
+ */
+public interface RoleMapper {
+    public Role getRole(Long id);
+    public Role findRole(String roleName);
+    public int deleteRole(Long id);
+    public int insertRole(Role role);
+}

src/main/java/com/liukai/demo/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.liukai.demo.RoleMapper">
+    <resultMap type="role" id="roleMap">
+        <id column="id" property="id" javaType="long" jdbcType="BIGINT" />
+        <result column="role_name" property="roleName" javaType="string"
+                jdbcType="VARCHAR" />
+        <result column="note" property="note"
+                typeHandler="com.liukai.demo.MyStringHandler" />
+    </resultMap>
+    <select id="getRole" parameterType="long" resultMap="roleMap">
+        select
+        id,role_name as roleName,note from role where id=#{id}
+    </select>
+    <select id="findRole" parameterType="long" resultMap="roleMap">
+        select
+        id,role_name,note from role where role_name like CONCAT('%',#{roleName
+        javaType=string,
+        jdbcType=VARCHAR,typeHandler=com.liukai.demo.MyStringHandler},'%')
+    </select>
+    <insert id="insertRole" parameterType="role">
+        insert into
+        role(role_name,note) value(#{roleName},#{note})
+    </insert>
+    <delete id="deleteRole" parameterType="long">
+        delete from role where
+        id=#{id}
+    </delete>
+</mapper>
\ No newline at end of file

src/main/resources/log4j.properties

+log4j.rootLogger=DEBUG,stdout
+log4j.logger.org.mybatis=DUBUG
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.appender.logDailyFile.layout.ConversionPattern = %5p %d %C:%m%n

src/main/resources/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>
+      &lt;!&ndash;  <setting name="lazyLoadingEnabled" value="true"/>&ndash;&gt;
+        &lt;!&ndash; <setting name="aggressiveLazyLoading" value="false"/> &ndash;&gt;
+    </settings>-->
+    <typeAliases>
+        <typeAlias alias="role" type="com.liukai.demo.Role"/>
+    </typeAliases>
+    <typeHandlers>
+        <typeHandler jdbcType="VARCHAR" javaType="string" handler="com.liukai.demo.MyStringHandler"/>
+    </typeHandlers>
+    <!-- 定义数据库的信息，默认使用development数据库构建环境 -->
+    <environments default="development">
+        <environment id="development">
+            <transactionManager type="JDBC" />
+            <dataSource type="POOLED">
+                <property name="driver" value="com.mysql.jdbc.Driver" />
+                <property name="url" value="jdbc:mysql://dev.config.duibar.com:3306/test" />
+                <property name="username" value="dev" />
+                <property name="password" value="dev_fas015" />
+            </dataSource>
+        </environment>
+    </environments>
+    <!-- 定义映射器 -->
+    <mappers>
+        <package name="com.liukai.demo"/>
+    </mappers>
+</configuration>