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工具类如下：
注意“./xml/mybatis-config.xml”指的是项目目录中mybatis的配置路径
package base;
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.Reader;
import java.sql.Connection;
/**
* mybatis工具类
@author panda
*
*/
public class MybatisUtil {
private static ThreadLocal<SqlSession> threadLocal = new ThreadLocal<SqlSession>();
private static SqlSessionFactory sqlSessionFactory;
static{
try {
Reader reader = Resources.getResourceAsReader("./xml/mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
private MybatisUtil() {}
public static SqlSession getSqlSession(){
SqlSession sqlSession = threadLocal.get();
if(sqlSession == null){
sqlSession = sqlSessionFactory.openSession();
threadLocal.set(sqlSession);
}
return sqlSession;
}
public static void closeSqlSession(){
SqlSession sqlSession = threadLocal.get();
if(sqlSession != null){
sqlSession.close();
threadLocal.remove();
}
}
public static void main(String[] args) {
Connection conn = MybatisUtil.getSqlSession().getConnection();
System.out.println(conn!=null ? "连接成功" : "连接失败");
}
}
mybatis-config.xml 的配置：
<?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>
<!--
| 全局配置设置
|
| 可配置选项 默认值, 描述
|
| aggressiveLazyLoading true, 当设置为‘true’的时候，懒加载的对象可能被任何懒属性全部加载。否则，每个属性都按需加载。
| multipleResultSetsEnabled true, 允许和不允许单条语句返回多个数据集（取决于驱动需求）
| useColumnLabel true, 使用列标签代替列名称。不同的驱动器有不同的作法。参考一下驱动器文档，或者用这两个不同的选项进行测试一下。
| useGeneratedKeys false, 允许JDBC 生成主键。需要驱动器支持。如果设为了true，这个设置将强制使用被生成的主键，有一些驱动器不兼容不过仍然可以执行。
| autoMappingBehavior PARTIAL, 指定MyBatis 是否并且如何来自动映射数据表字段与对象的属性。PARTIAL将只自动映射简单的，没有嵌套的结果。FULL 将自动映射所有复杂的结果。
| defaultExecutorType SIMPLE, 配置和设定执行器，SIMPLE 执行器执行其它语句。REUSE 执行器可能重复使用prepared statements 语句，BATCH执行器可以重复执行语句和批量更新。
| defaultStatementTimeout null, 设置一个时限，以决定让驱动器等待数据库回应的多长时间为超时
| -->
<settings>
<!-- 这个配置使全局的映射器启用或禁用缓存 -->
<setting name="cacheEnabled" value="true" />
<!-- 全局启用或禁用延迟加载。当禁用时，所有关联对象都会即时加载 -->
<setting name="lazyLoadingEnabled" value="true" />
<setting name="multipleResultSetsEnabled" value="true" />
<setting name="useColumnLabel" value="true" />
<setting name="defaultExecutorType" value="REUSE" />
<setting name="defaultStatementTimeout" value="25000" />
</settings>
<!-- 查询对象别名配置 -->
<typeAliases>
<!--
<typeAlias alias="taskVo" type="xxx.vo.TaskVo" />
-->
</typeAliases>
<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://127.0.0.1:3306/xxxx"/>
<property name="username" value="xxxx"/>
<property name="password" value="xxxx"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/blog/ifootage/mapper/xml/FeedsMapper.xml"/>
</mappers>
</configuration>
关联的的feedsMapper接口与实体类
<?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.blog.ifootage.mapper.FeedsMapper">
<!--获取用户列表-->
<select id="selectFeedsById" resultType="com.blog.ifootage.entity.Feeds" parameterType="java.lang.Integer">
SELECT * FROM mto_feeds WHERE author_id = #{authorId}
</select>
</mapper>
package com.blog.ifootage.entity;
import com.baomidou.mybatisplus.activerecord.Model;
import java.io.Serializable;
import java.util.Date;
/**
* <p>
*
* </p>
*
* @author panda
* @since 2017-06-15
*/
//@TableName("mto_feeds")
public class Feeds extends Model<Feeds> {
private static final long serialVersionUID = 1L;
private Long id;
// @TableField("author_id")
private Integer author_id;
private Date created;
// @TableField("own_id")
private Integer own_id;
// @TableField("post_id")
private Integer post_id;
private Integer type;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public Integer getType() {
return type;
}
public void setType(Integer type) {
this.type = type;
}
@Override
protected Serializable pkVal() {
return this.id;
}
public Integer getAuthor_id() {
return author_id;
}
public void setAuthor_id(Integer author_id) {
this.author_id = author_id;
}
public Integer getOwn_id() {
return own_id;
}
public void setOwn_id(Integer own_id) {
this.own_id = own_id;
}
public Integer getPost_id() {
return post_id;
}
public void setPost_id(Integer post_id) {
this.post_id = post_id;
}
}
开始MyBatis的接口测试了
/**
* Created by pengdan on 2017/10/14.
*/
public class Test1 {
@Test
public void select(){
SqlSession sqlSession = null;
try {
sqlSession = MybatisUtil.getSqlSession();
List<Feeds> i = sqlSession.selectList("com.blog.ifootage.mapper.FeedsMapper.selectFeedsById",20);
System.out.println("本次操作影响"+i+"行数据");
sqlSession.commit();
} catch (Exception e) {
e.printStackTrace();
sqlSession.rollback();
}
finally{
MybatisUtil.closeSqlSession();
}
}
}