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  • MyBatis之MyBatis环境搭建

    MyBatis之MyBatis环境搭建

     

    一、MyBatis开发环境搭建
    1.引入Jar包

      ①MyBatis

        mybatis-3.4.1.jar
        ant-1.9.6.jar
        ant-launcher-1.9.6.jar
        asm-5.1.jar
        cglib-3.2.4.jar
        commons-logging-1.2.jar
        javassist-3.21.0-GA.jar
        log4j-1.2.17.jar
        log4j-api-2.3.jar
        log4j-core-2.3.jar
        ognl-3.1.12.jar
        slf4j-api-1.7.22.jar
        slf4j-log4j12-1.7.22.jar

      ②MySQL:
        mysql-connector-java-5.1.7-bin.jar

     

    2.创建配置文件:mybatis_config.xml

     1 <?xml version="1.0" encoding="UTF-8" ?>
     2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
     3 <configuration>
     4   <environments default="development">
     5     <environment id="development">
     6       <transactionManager type="JDBC" />
     7       <!-- 配置数据源:链接池 -->
     8       <dataSource type="POOLED">
     9         <property name="driver" value="com.mysql.jdbc.Driver" />
    10         <property name="url" value="jdbc:mysql://localhost:3306/mybatis_01" />
    11         <property name="username" value="root" />
    12         <property name="password" value="root" />
    13       </dataSource>
    14     </environment>
    15   </environments>
    16   <!-- 注册映射文件 -->
    17   <mappers>
    18     <mapper resource="cn/com/zfc/model/UserMapper.xml" />
    19   </mappers>
    20 </configuration>

    3.创建实体类:User.java

     1 package cn.com.zfc.model;
     2 
     3 /**
     4 * 
     5 * @title User
     6 * @describe User 模型类 Model 层
     7 * @author 张富昌
     8 * @date 2017年2月25日上午11:42:11
     9 */
    10 public class User {
    11   private Integer id;
    12   private String name;
    13   private String sex;
    14 
    15   public User(Integer id, String name, String sex) {
    16     super();
    17     this.id = id;
    18     this.name = name;
    19     this.sex = sex;
    20   }
    21 
    22   public User() {
    23     super();
    24   }
    25 
    26   public Integer getId() {
    27     return id;
    28   }
    29 
    30   public void setId(Integer id) {
    31     this.id = id;
    32   }
    33 
    34   public String getName() {
    35     return name;
    36   }
    37 
    38   public void setName(String name) {
    39     this.name = name;
    40   }
    41 
    42   public String getSex() {
    43     return sex;
    44   }
    45 
    46   public void setSex(String sex) {
    47     this.sex = sex;
    48   }
    49 
    50   @Override
    51   public String toString() {
    52     return "User [id=" + id + ", name=" + name + ", sex=" + sex + "]";
    53   }
    54 
    55 }

    4.创建映射文件:UserMapper.xml

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
     3 <!-- mapper:映射文件,namespace:命名空间 -->
     4 <mapper namespace="cn.com.zfc.model.UserMapper">
     5   <!-- 查询一个 User 对象 -->
     6   <!-- parameterType:参数类型,resultType:返回结果类型 -->
     7   <select id="getOne" parameterType="java.lang.Integer" resultType="cn.com.zfc.model.User">
     8     select *
     9     from user
    10     where
    11     id=#{id}
    12   </select>
    13 </mapper>

    二、基本使用流程
    1、获取 InputStream 对象,加载 Mybatis 配置文件 
      InputStream inputStream = Test01.class.getClassLoader().getResourceAsStream("mybatis_config.xml");
    2、创建 SqlSessionFactoryBuilder,用来获取 SqlSessionFactory 对象 
      SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
    3、获取 SqlSessionFactory 对象
      SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
    4、获取 SqlSession 对象
      SqlSession sqlSession = sqlSessionFactory.openSession();
    5、定义 statement 
      String statement = "cn.com.zfc.model.UserMapper.getOne";
    6、执行查询语句 
      User user = sqlSession.selectOne(statement, 1);
      System.out.println("User:" + user);
    7、提交事务 
      sqlSession.commit();
    8、关闭 Session 
      sqlSession.close();

    三、测试MyBatis环境:TestMyBatis.java

     1 package cn.com.zfc.test;
     2 
     3 import java.io.InputStream;
     4 
     5 import org.apache.ibatis.session.SqlSession;
     6 import org.apache.ibatis.session.SqlSessionFactory;
     7 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
     8 
     9 import cn.com.zfc.model.User;
    10 
    11 /**
    12 * 
    13 * @title TestMyBatis
    14 * @describe 测试 Mybatis
    15 * @author 张富昌
    16 * @date 2017年2月25日下午4:18:15
    17 */
    18 public class TestMyBatis {
    19   public static void main(String[] args) {
    20     /* 1、获取 InputStream 对象,加载 Mybatis 配置文件 */
    21     InputStream inputStream = TestMyBatis.class.getClassLoader().getResourceAsStream("mybatis_config.xml");
    22     /* 2、创建 SqlSessionFactoryBuilder,用来获取 SqlSessionFactory 对象 */
    23     SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
    24     /* 3、获取 SqlSessionFactory 对象 */
    25     SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
    26     /* 4、获取 SqlSession 对象 */
    27     SqlSession sqlSession = sqlSessionFactory.openSession();
    28     /* 5、定义 statement */
    29     String statement = "cn.com.zfc.model.UserMapper.getOne";
    30     /* 6、执行查询语句 */
    31     User user = sqlSession.selectOne(statement, 1);
    32     System.out.println("User:" + user);
    33     /* 7、提交事务 */
    34     sqlSession.commit();
    35     /* 8、关闭 Session */
    36     sqlSession.close();
    37   }
    38 }
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  • 原文地址:https://www.cnblogs.com/zfc-java/p/6683973.html
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