标签：
一.搭建环境,
建立数据库
1 CREATE TABLE user( 2 id int(11) not NULL AUTO_INCREMENT, 3 userName varchar(50) DEFAULT NULL, 4 userAge int(11) DEFAULT NULL, 5 userAddress varchar(200) DEFAULT NULL, 6 PRIMARY KEY(id) 7 )ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
建立一个myBatis的java项目(不需要web项目)
然后倒入jar包
建总配置文件:
在src下建configration包.在建Configurations.xml文件
代码如下:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE configuration PUBLIC " -//mybatis.org//DTD Config 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 4 <configuration> 5 <typeAliases> 6 <typeAlias type="com.user.User" alias="User"/> 7 </typeAliases> 8 <environments default="development"> 9 <environment id="development"> 10 <transactionManager type="JDBC" /> 11 <dataSource type="POOLED"> 12 <property name="driver" value="com.mysql.jdbc.Driver"/> 13 <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis"/> 14 <property name="username" value="root"/> 15 <property name="password" value="123"/> 16 </dataSource> 17 </environment> 18 </environments> 19 20 <mappers> 21 <mapper resource="configration/User.xml"/>
</mappers> 24 </configuration>
建user的实体类和映射文件:
com.user.User代码:
1 package com.user; 2 3 public class User { 4 private int id; 5 private String userName; 6 private String userAge; 7 private String userAddress; 8 public int getId() { 9 return id; 10 } 11 public void setId(int id) { 12 this.id = id; 13 } 14 public String getUserName() { 15 return userName; 16 } 17 public void setUserName(String userName) { 18 this.userName = userName; 19 } 20 public String getUserAge() { 21 return userAge; 22 } 23 public void setUserAge(String userAge) { 24 this.userAge = userAge; 25 } 26 public String getUserAddress() { 27 return userAddress; 28 } 29 public void setUserAddress(String userAddress) { 30 this.userAddress = userAddress; 31 } 32 33 }
configration包下见User.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 4 5 <mapper namespace="User"> 6 <select id="selectUserById" parameterType="int" resultType="User"> 7 select * from user where id=#{id} 8 </select> 9 <select id="selectUserList" parameterType="int" resultType="User"> 10 select * from user 11 </select> 12 </mapper>
建测试类
1 package test; 2 3 import java.io.Reader; 4 import java.util.List; 5 6 import org.apache.ibatis.io.Resources; 7 import org.apache.ibatis.session.SqlSession; 8 import org.apache.ibatis.session.SqlSessionFactory; 9 import org.apache.ibatis.session.SqlSessionFactoryBuilder; 10 11 import com.user.User; 12 13 public class Test { 14 private static SqlSessionFactory sqlSessionFactory; 15 private static Reader reader; 16 17 static { 18 try { 19 reader = Resources.getResourceAsReader("configration/Configurations.xml"); 20 sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); 21 } catch (Exception e) { 22 e.printStackTrace(); 23 } 24 } 25 public static void main(String[] args) { 26 SqlSession session = sqlSessionFactory.openSession(); 27 try { 28 //User user = (User) session.selectOne("User.selectUserById", 2); 29 List<User> list=session.selectList("User.selectUserList"); 30 for(User user:list){ 31 System.out.println("姓名:"+user.getUserName()); 32 System.out.println("年龄"+user.getUserAge()); 33 System.out.println("地址:"+user.getUserAddress()); 34 System.out.println("-----------------------------------------------------------"); 35 } 36 37 } catch (Exception e) { 38 System.out.println("出现异常了....."); 39 e.printStackTrace(); 40 } finally { 41 session.close(); 42 } 43 } 44 }
当你查看到从数据库中读取的数据时,说明环境搭建完毕了
二.用接口的方式实现编程.
建立IUserOperation.java
1 package inter; 2 3 import java.util.List; 4 5 import com.user.User; 6 7 public interface IUserOperation { 8 public User selectUserById(int id); 9 public List<User> selectUserList(); 10 }
建立IUser.xml.
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 4 5 <mapper namespace="inter.IUserOperation"> 6 <select id="selectUserById" parameterType="int" resultType="User"> 7 select * from user where id=#{id} 8 </select> 9 <select id="selectUserList" resultType="User"> 10 select * from user 11 </select> 12 </mapper>
注意这个地方的namspace就不可以随意取名字了.必须是实现接口的地址.
在总配置文件中mappers添加一条xml:<mapper resource="configration/IUser.xml"/>
添加测试类:
1 package test; 2 3 import inter.IUserOperation; 4 5 import java.io.Reader; 6 import java.util.List; 7 8 import org.apache.ibatis.io.Resources; 9 import org.apache.ibatis.session.SqlSession; 10 import org.apache.ibatis.session.SqlSessionFactory; 11 import org.apache.ibatis.session.SqlSessionFactoryBuilder; 12 13 import com.user.User; 14 15 /** 16 * 以接口的方式编程 17 * 如果以这种方式的话,那么对应的sql的xml配置文件中的namespace必须是实现接口的具体地址 18 */ 19 public class TestInterface { 20 private static SqlSessionFactory sqlSessionFactory; 21 private static Reader reader; 22 23 static { 24 try { 25 reader = Resources.getResourceAsReader("configration/Configurations.xml"); 26 sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); 27 } catch (Exception e) { 28 e.printStackTrace(); 29 } 30 } 31 public static void main(String[] args) { 32 SqlSession session = sqlSessionFactory.openSession(); 33 try { 34 IUserOperation userOperation=session.getMapper(IUserOperation.class); 35 /*User user=userOperation.selectUserById(3); 36 System.out.println(user.getUserAddress()); 37 System.out.println(user.getUserName());*/ 38 39 List<User> list=userOperation.selectUserList(); 40 for(User user:list){ 41 System.out.println("姓名:"+user.getUserName()); 42 System.out.println("年龄:"+user.getUserAge()); 43 System.out.println("地址:"+user.getUserAddress()); 44 System.out.println("--------------------------------"); 45 } 46 47 48 } catch (Exception e) { 49 System.out.println("出现异常了....."); 50 e.printStackTrace(); 51 } finally { 52 session.close(); 53 } 54 } 55 }
标签：
原文地址：http://www.cnblogs.com/guoyansi19900907/p/4462449.html
