2019-01-22_Mybatis关于mysql简单操作学习 2019-01-22_Mybatis关于mysql简单操作

Mybatis关于mysql简单操作学习
1.概述
对mybatis常用的操作命令做一下总结,数据库基于mysql。后面章节会涉及数据的批量插入、批量更新和更新后返回主键ID等内容。
1.数据库信息
1.1.表结构定义
CREATE TABLE users (
id int(11) NOT NULL AUTO_INCREMENT,
NAME varchar(20) DEFAULT NULL,
age int(11) DEFAULT NULL,
remark varchar(200) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=682 DEFAULT CHARSET=utf8;
1.2.数据库配置db.properties
mysql.driver=com.mysql.jdbc.Driver
需要开启多行执行功能 jdbc:mysql://localhost:3306/mybatis?userUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&autoReconnect=true&failOverReadOnly=false" jdbc:mysql://localhost:3306/mybatis?userUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC&allowMultiQueries=true" mysql.url=jdbc:mysql://localhost:3306/mybatis?userUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
mysql.username=root
mysql.password=123456
1.3.实体类
package com.tech.ability.mybatis.Entity;
/**

Created by kikop on 2019/1/17.
*/
public class MyUser {
//实体类的属性和表的字段名称一一对应
private int id;
private String name;
private int age;
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
private String remark;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "MyUser{" +
"age=" + age +
", id=" + id +
", name='" + name + ''' +
", remark='" + remark + ''' +
'}';
}

}
2.mybatis mapper接口文件
package com.tech.ability.mybatis.Mapper;
import com.alibaba.fastjson.JSONObject;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.SelectKey;
import org.springframework.data.repository.query.Param;
/**

Created by kikop on 2019/5/19.
*/
public interface MyUserMapper {

}
3.mybatis sqlmap映射文件

select * from users where id=#{intid}

select * from users where id in (#{strQueryIds})select * from users where id in #{id} select * from users where id in ${id}

4.mybatis工具类
package com.tech.ability.mybatis;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.ExecutorType;
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;
/**

Created by kikop on 2019/5/19.
*/
public class mybatisUtils {
//mybatis核心配置文件
private static final String mybatis_configPath = "mybatisconfig.xml";

/** * 读取SqlSession * * @return */ public static SqlSession getSqlSession(ExecutorType execType, boolean isAutoCommit) {SqlSession sqlSession = null; try { //1.读取mybatis的配置文件 //String resource = "mybatisconfig.xml"; //2.构建sqlSession的工厂 //使用类加载器加载 mybatis 的 classspath中配置文件 InputStream inputStream = null;

// InputStream inputStream = mybatisTest.class.getClassLoader().getResourceAsStream(resource);
inputStream = Resources.getResourceAsStream(mybatis_configPath);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

//2.构建sqlSession的工厂 //使用MyBatis提供的Resources类加载mybatis的配置文件（它也加载关联的映射文件） //Reader reader = Resources.getResourceAsReader(resource); //SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader); //3.创建能执行映射文件中sql的sqlSession

// sqlSession = sessionFactory.openSession(isAutoCommit);
sqlSession = sessionFactory.openSession(execType, isAutoCommit);

} catch (IOException e) { e.printStackTrace(); }return sqlSession; }/** * 关闭session(回收连接池必须) * * @param session */ public static void closeSqlSession(SqlSession session) { session.close(); }/** * 关闭inputStream * * @param inputStream */ public static void closeInputSream(InputStream inputStream) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } }

}
5.测试代码
5.1.测试1
package com.tech.ability.mybatis;
import com.alibaba.fastjson.JSONObject;
import com.tech.ability.mybatis.Entity.MyUser;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.util.ArrayList;
import java.util.List;
/**

Created by kikop on 2019/1/17.
*/
public class mybatisTest {
private static final Logger logger = LogManager.getLogger(mybatisTest.class);
/**
- getUserInfoByIDTest
  */
  public static void getUserInfoByIDTest() {
  //1.构建sqlSession
  SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
  //2.映射sql的标识字符串
  //String statement = "com.skill.tech.mybatis.Mapper.MyUserMapper.getUserInfoByID"; //映射sql的标识字符串
  StringBuffer statement = new StringBuffer();
  statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
  statement.append(".getUserInfoByID"); //select标签的id属性值
  //3.定义查询条件
  int intid = 2;
  //4.执行查询返回一个唯一user对象的sql
  MyUser myUser = session.selectOne(statement.toString(), intid);
  mybatisUtils.closeSqlSession(session);
  //5.输出结果
  System.out.println(myUser);
【2019-01-22_Mybatis关于mysql简单操作学习】}
5.2.测试2
/**
- getUserInfoByInTest
  */
  private static void getUserInfoByInTest() {
  //1.构建sqlSession
  SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
  //2.映射sql的标识字符串
  StringBuffer statement = new StringBuffer();
  statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
  statement.append(".getUserInfoByIn"); //select标签的id属性值
  //3.定义查询条件
  String strQueryIds = "1,2";
  //4.执行查询返回一个唯一user对象的sql
  List myUser = session.selectList(statement.toString(), strQueryIds);
  mybatisUtils.closeSqlSession(session);
  //5.输出结果
  System.out.println(myUser);
}
5.3.测试3
/**
- getUserInfoByInnerForeachTest
  */
  private static void getUserInfoByInnerForeachTest() {
  //1.构建sqlSession
  SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
  //3.映射sql的标识字符串
  StringBuffer statement = new StringBuffer();
  statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
  statement.append(".getUserInfoByInnerForeach"); //select标签的id属性值
  //3.定义查询条件
  JSONObject jsonObject = new JSONObject();
  List idList = new ArrayList<>();
  idList.add(1);
  idList.add(11);
  jsonObject.put("idList", idList);
  //4.执行查询返回一个唯一user对象的sql
  List myUser = session.selectList(statement.toString(), jsonObject);
  mybatisUtils.closeSqlSession(session);
  //5.输出结果
  System.out.println(myUser);
  }
  5.1.测试4
/**
- getUserInfoByInnerForeachRetJsonTest
  */
  private static void getUserInfoByInnerForeachRetJsonTest() {
  //1.构建sqlSession
  SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
  //2.映射sql的标识字符串
  StringBuffer statement = new StringBuffer();
  statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
  statement.append(".getUserInfoByInnerForeachRetJson"); //select标签的id属性值
  //3.定义查询条件
  JSONObject jsonObject = new JSONObject();
  List idList = new ArrayList<>();
  idList.add(1);
  idList.add(92);
  jsonObject.put("idList", idList);
  //4.执行查询返回一个唯一user对象的sql
  List myUser = session.selectList(statement.toString(), jsonObject);
  mybatisUtils.closeSqlSession(session);
  //5.输出结果
  System.out.println(myUser);
  }

6.调用
public static void main(String[] args) throws Exception {
//getUserInfoByIDTest();
//getUserInfoByInTest();
//getUserInfoByInnerForeachTest();
//batchUpdateUserInfoListManualTest();
//batchUpdateUserInfoListAutoTest();
//batchInsertUserInfoListByUnionAllTest();
//batchInsertUserInfoListByExecutorBachTest2();
//insertUserXmlTest();
batchInsertUserInfoListByUnionAllTest();
}
}
总结
1.数据库连接时,设置运行多行查询。
2.多条语句,用“；”隔开即可。