目录结构
com.geyao.mybatis.mapper
BlogMapper类
package com.geyao.mybatis.mapper;
import java.util.List;
import com.geyao.mybatis.pojo.Blog;
public interface BlogMapper {
Blog selectBlog(Integer id);
Blog selectBlog2(Integer id);
List<Blog> selectBlogByTitle(String title);
List<Blog> selectBlogByTitle2(String title);
List<Blog> selectBlogBySort(String column);
}
BlogMapper.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">
<!-- 为这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)
-->
<mapper namespace="com.geyao.mybatis.mapper.BlogMapper">
<!-- 在select标签中编写查询的SQL语句， 设置select标签的id属性为getUser，id属性值必须是唯一的，不能够重复
使用parameterType属性指明查询时使用的参数类型，resultType属性指明查询返回的结果集类型
resultType="me.gacl.domain.User"就表示将查询结果封装成一个User类的对象返回
User类就是users表所对应的实体类
-->
<!--
根据id查询得到一个user对象
-->
<resultMap type="Blog" id="blogResultMap">
<id column="id" property="id" jdbcType="INTEGER"></id>
<result column="authod_id" property="authodId" jdbcType="INTEGER"/>
</resultMap>
<select id="selectBlog" parameterType="int" resultType="Blog">
select
id,
title,
authod_id as authodId,
state,
featured,
style
from Blog where id=#{id}
</select>
<select id="selectBlog2" parameterType="int" resultMap="blogResultMap">
select *
from Blog where id=#{id}
</select>
<select id="selectBlogByTitle" parameterType="String" resultMap="blogResultMap">
select * from Blog where title like #{title}
</select>
<select id="selectBlogByTitle2" parameterType="String" resultMap="blogResultMap">
select * from Blog where title like '${value}'
</select>
<select id="selectBlogBySort" parameterType="String" resultMap="blogResultMap">
select * from Blog order by ${value}
</select>
</mapper>
com.geyao.mybatis.pojo
Blog类
package com.geyao.mybatis.pojo;
public class Blog {
private Integer id;
private String title;
private int authodId;
private String state;
private Boolean featured;
private String style;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getAuthodId() {
return authodId;
}
public void setAuthodId(int authodId) {
this.authodId = authodId;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public Boolean getFeatured() {
return featured;
}
public void setFeatured(Boolean featured) {
this.featured = featured;
}
public String getStyle() {
return style;
}
public void setStyle(String style) {
this.style = style;
}
@Override
public String toString() {
return "Blog [id=" + id + ", title=" + title + ", authodId=" + authodId + ", state=" + state + ", featured="
+ featured + ", style=" + style + "]\n";
}
}
com.geyao.mybatis.util
MybatisUtil类
package com.geyao.mybatis.util;
import java.io.InputStream;
import java.io.Reader;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MyBatisUtil {
private static SqlSessionFactory sqlSessionFactory =null;
static {
try {
InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private MyBatisUtil() {}
public static SqlSession getSqlSession() {
return sqlSessionFactory.openSession();
}
}
log4j.properties
### \u914D\u7F6E\u6839 ###
log4j.rootLogger = debug,console ,fileAppender,dailyRollingFile,ROLLING_FILE,MAIL,DATABASE
### \u8BBE\u7F6E\u8F93\u51FAsql\u7684\u7EA7\u522B\uFF0C\u5176\u4E2Dlogger\u540E\u9762\u7684\u5185\u5BB9\u5168\u90E8\u4E3Ajar\u5305\u4E2D\u6240\u5305\u542B\u7684\u5305\u540D ###
log4j.logger.org.apache=dubug
log4j.logger.java.sql.Connection=dubug
log4j.logger.java.sql.Statement=dubug
log4j.logger.java.sql.PreparedStatement=dubug
log4j.logger.java.sql.ResultSet=dubug
### \u914D\u7F6E\u8F93\u51FA\u5230\u63A7\u5236\u53F0 ###
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%n
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>
<typeAliases>
<typeAlias type="com.geyao.mybatis.pojo.Blog" alias="Blog"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<!-- 配置数据库连接信息 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.cj.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2B8" />
<property name="username" value="root" />
<property name="password" value="123" />
</dataSource>
</environment>
</environments>
<mappers>
<!-- 注册userMapper.xml文件，
userMapper.xml位于me.gacl.mapping这个包下，所以resource写成me/gacl/mapping/userMapper.xml-->
<mapper resource="com/geyao/mybatis/mapper/BlogMapper.xml"/>
</mappers>
</configuration>
单元测试
com.geyao.mybatis.util
testSelectBlog类
package com.geyao.mybatis.mapper;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import com.geyao.mybatis.pojo.Blog;
import com.geyao.mybatis.util.MyBatisUtil;
public class testSelectBlog {
@Test
public void testSelectBlogNoInterface() {
SqlSession session =MyBatisUtil.getSqlSession();
Blog blog =(Blog)session.selectOne("com.geyao.mybatis.mapper.BlogMapper.selectBlog", 101);
session.close();
System.out.println(blog);
}
@Test
public void testSelectBlog() {
SqlSession session =MyBatisUtil.getSqlSession();
BlogMapper blogMapper =session.getMapper(BlogMapper.class);
Blog blog = blogMapper.selectBlog(1);
System.out.println(blog);
}
@Test
public void testSelectBlog2() {
SqlSession session =MyBatisUtil.getSqlSession();
BlogMapper blogMapper =session.getMapper(BlogMapper.class);
Blog blog = blogMapper.selectBlog2(1);
System.out.println(blog);
}
@Test
public void testselectBlogByTitle() {
SqlSession session =MyBatisUtil.getSqlSession();
BlogMapper blogMapper =session.getMapper(BlogMapper.class);
List<Blog> blogList = blogMapper.selectBlogByTitle("%g%");
System.out.println(blogList);
}
@Test
public void testselectBlogByTitle2() {
SqlSession session =MyBatisUtil.getSqlSession();
BlogMapper blogMapper =session.getMapper(BlogMapper.class);
List<Blog> blogList = blogMapper.selectBlogByTitle2("%g%");
System.out.println(blogList);
}
@Test
public void testselectBlogBySort() {
SqlSession session =MyBatisUtil.getSqlSession();
BlogMapper blogMapper =session.getMapper(BlogMapper.class);
List<Blog> blogList = blogMapper.selectBlogBySort("title");
System.out.println(blogList);
}
}
jar包
链接：https://pan.baidu.com/s/1g6NgzfLc5uK9S4VL-03lHg
提取码：4r2m
运行结果
