目录

一、创建数据库

二、添加log4j日志

三、定义java类和配置xml

3.1 定义xml，xml 中的id作为操作sql的唯一标识

3.2 定义接口，接口方法作为操作sql 的唯一标识

一、创建数据库

-- ----------------------------
-- Table structure for `user`
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(20) DEFAULT NULL,`age` int(11) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'Tom', '12');
INSERT INTO `user` VALUES ('2', 'Jack', '11');

下面是测试代码，测试目录如下：

二、添加log4j日志

log4j.rootLogger=DEBUG, Console#Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

三、定义java类和配置xml

3.1 定义xml，xml 中的id作为操作sql的唯一标识

1. 与数据库对应的javabean

package com.hb.bean;public class User {private int id;private String name;private int age;//get,set方法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;}public User(int id, String name, int age) {super();this.id = id;this.name = name;this.age = age;}public User() {}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", age=" + age + "]";}}

2. 配置mybatis的配置文件

<?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><!-- changes from the defaults for testing --><setting name="cacheEnabled" value="false" /><setting name="useGeneratedKeys" value="true" /><setting name="defaultExecutorType" value="REUSE" /></settings><typeAliases><typeAlias alias="User" type="com.hb.bean.User" /></typeAliases><environments default="development"><environment id="development"><transactionManager type="jdbc" /><dataSource type="POOLED"><!-- <property name="driver" value="oracle.jdbc.driver.OracleDriver"/> <property name="url" value="jdbc:oracle:thin:@192.168.56.201:1521:system"/> --><property name="driver" value="com.mysql.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/mybatis" /><property name="username" value="root" /><property name="password" value="123456" /></dataSource></environment></environments>
<!-- 访问数据库的映射文件 --><mappers><mapper resource="com/hb/bean/userDao.xml" /><mapper class="com.hb.mapper.UserMapper" /></mappers></configuration>

3. 访问xml文件操作数据库

<?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.hb.bean.userDao"><!-- 这里namespace必须是“包名 + xml文件名”，不然要运行的时候要报错 “is not known to the MapperRegistry” --><insert id="insertUser" parameterType="com.hb.bean.User">insert into user(name, age) values(#{name}, #{age});</insert><delete id="deleteUser" parameterType="int">delete from user where id=#{id}</delete><update id="updateUser" parameterType="com.hb.bean.User">update user set name=#{name},age=#{age} where id=#{id}</update><select id="selectUser" parameterType="int"resultType="com.hb.bean.User">select * from user where id=#{id}</select><select id="selectAlluser" resultType="com.hb.bean.User">select * from user</select></mapper>

4. 测试

package com.hb.test1;import java.io.InputStream;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;import com.hb.bean.User;public class Test1 {public static SqlSessionFactory sqlSessionFactory;public static SqlSession sqlSession;@Beforepublic void init(){//"/"表示是在src根目录下String source = "config.xml";InputStream inputStream = Test1.class.getClassLoader().getResourceAsStream(source);try {sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//          sqlSession = sqlSessionFactory.openSession();//是否自动提交，默认不是自动提交的sqlSession = sqlSessionFactory.openSession(true);} catch (Exception e) {e.printStackTrace();}}@Testpublic void add(){String statment = "com.hb.bean.userDao.insertUser";User user = new User();user.setId(4);user.setAge(100);user.setName("father");sqlSession.insert(statment, user);//添加数据需要commit，默认是不commitsqlSession.commit();//关闭sessionsqlSession.close();}@Testpublic void selectById(){String statment = "com.hb.bean.userDao.selectUser";User user = sqlSession.selectOne(statment, "1");System.out.println(user);}@Testpublic void update(){String statment = "com.hb.bean.userDao.updateUser";User user = new User();user.setId(1);;user.setAge(100);user.setName("mather");sqlSession.update(statment, user);System.out.println(user);}@Testpublic void delete(){String statment = "com.hb.bean.userDao.deleteUser";sqlSession.delete(statment, 6);//添加数据需要commit，默认是不commitsqlSession.commit();//关闭sessionsqlSession.close();}}

3.2 定义接口，接口方法作为操作sql 的唯一标识

package com.hb.mapper;import java.util.List;import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;import com.hb.bean.User;public interface UserMapper {@Insert("insert into user(name, age) values(#{name}, #{age})")public int insertUser(User user);@Delete("delete from user where id=#{id}")public int deleteUserById(int id);@Update("update user set name=#{name},age=#{age} where id=#{id}")public int updateUser(User user);@Select("select * from user where id=#{id}")public User getUserById(int id);@Select("select * from user")public List<User> getAllUser();}

package com.hb.test1;import java.io.InputStream;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;import com.hb.bean.User;public class AnnotationTest1 {public static SqlSessionFactory sqlSessionFactory;public static SqlSession sqlSession;@Beforepublic void init(){//"/"表示是在src根目录下String source = "config.xml";InputStream inputStream = AnnotationTest1.class.getClassLoader().getResourceAsStream(source);try {sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//          sqlSession = sqlSessionFactory.openSession();//是否自动提交，默认不是自动提交的sqlSession = sqlSessionFactory.openSession(true);} catch (Exception e) {e.printStackTrace();}}@Testpublic void add(){String statment = "com.hb.mapper.UserMapper.insertUser";User user = new User();user.setId(4);user.setAge(100);user.setName("father");sqlSession.insert(statment, user);//添加数据需要commit，默认是不commitsqlSession.commit();//关闭sessionsqlSession.close();}@Testpublic void selectById(){String statment = "com.hb.mapper.UserMapper.selectUser";User user = sqlSession.selectOne(statment, "1");System.out.println(user);}@Testpublic void update(){String statment = "com.hb.mapper.UserMapper.updateUser";User user = new User();user.setId(1);;user.setAge(100);user.setName("mather");sqlSession.update(statment, user);System.out.println(user);}@Testpublic void delete(){String statment = "com.hb.mapper.UserMapper.deleteUser";sqlSession.delete(statment, 6);//添加数据需要commit，默认是不commitsqlSession.commit();//关闭sessionsqlSession.close();}}