Mybatis实现数据的增删改查

Mybatis实现数据的增删改查

1、项目结构(使用maven创建项目)

2、App.java

 package com.GetcharZp.MyBatisStudy;

 import java.io.IOException;
 import java.io.InputStream;
 import java.util.List;

 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 com.GetcharZp.MyBatisStudy.dao.TradeDao;
 import com.GetcharZp.MyBatisStudy.model.Trade;

 /**
  * Hello world!
  *
  */
 public class App
 {
     public static void main( String[] args )
     {
         InputStream config = null;
         try {
             config = Resources.getResourceAsStream("mybatis-config.xml");
             SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(config);
             SqlSession session = factory.openSession();
             TradeDao tradeDao = session.getMapper(TradeDao.class);

             /*删除*/
             tradeDao.deleteTrade(3);
             session.commit(); // 删除要提交

             /*查询*/
             List<Trade> tradeList = tradeDao.selectTrade();
             System.out.println(tradeList);
             System.out.println(tradeList.size());
             Trade trade = tradeDao.findById(2);
             System.out.println(trade); // 日志里面有输出，但结果没有

             /*插入*/
             Trade InsertTrade = new Trade();
             InsertTrade.setTradeId(4);
             InsertTrade.setTradeName("毛笔");
             InsertTrade.setTradePrice(5.6);
             tradeDao.insertTrade(InsertTrade);
             session.commit();

             /*更新*/
             Trade updateTrade1 = new Trade();
             updateTrade1.setTradeName("watch");
             updateTrade1.setTradePrice(520.1314);
             tradeDao.updateTrade(3);
             session.commit();

             session.close();

         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             if (config != null)
                 try {
                     config.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
         }
     }
 }

3、TradeDao

 package com.GetcharZp.MyBatisStudy.dao;

 import java.util.List;

 import com.GetcharZp.MyBatisStudy.model.Trade;

 public interface TradeDao { // interface 接口

     public List<Trade> selectTrade();
     public void deleteTrade(int tradeId);
     public void updateTrade(int tradeId);
     public void insertTrade(Trade newTrade);
     public Trade findById(int tradeId);
 }

4、Trade

 package com.GetcharZp.MyBatisStudy.model;

 public class Trade {

     private Integer tradeId;
     private String tradeName;
     private Double tradePrice;
     public Integer getTradeId() {
         return tradeId;
     }
     public void setTradeId(Integer tradeId) {
         this.tradeId = tradeId;
     }
     public String getTradeName() {
         return tradeName;
     }
     public void setTradeName(String tradeName) {
         this.tradeName = tradeName;
     }
     public Double getTradePrice() {
         return tradePrice;
     }
     public void setTradePrice(Double tradePrice) {
         this.tradePrice = tradePrice;
     }
     @Override
     public String toString() {
         return "Trade [tradeId=" + tradeId + ", tradeName=" + tradeName + ", tradePrice=" + tradePrice + "]";
     }
 }

5、TradeMapper

 <?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.GetcharZp.MyBatisStudy.dao.TradeDao">
     <select id="selectTrade" resultType="com.GetcharZp.MyBatisStudy.model.Trade">
         select * from trade
     </select>
     <select id="findById" resultType="com.GetcharZp.MyBatisStudy.model.Trade">
         select * from trade where trade_id=#{tradeId}
     </select>
     <delete id="deleteTrade">
         delete from trade where trade_id = #{tradeId}
     </delete>
     <insert id="insertTrade">
         insert into trade (trade_id, trade_name, trade_price)
         values(#{tradeId}, #{tradeName}, #{tradePrice})
     </insert>
     <update id="updateTrade">
         update trade set
             trade_name = #{tradeName},
             trade_price = #{tradePrice}
         where
             trade_id = #{tradeId}
     </update>
 </mapper>

6、mybatis-config.xml:

<?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>
        <!-- <setting name="logImpl" value="STDOUT_LOGGING" /> -->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <typeAliases>
        <package name="com.GetcharZp.MyBatisStudy.model"/>
    </typeAliases>
    <environments default="dev">
        <environment id="dev">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/suse"/>
                <property name="username" value="root"/>
                <property name="password" value="1234"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mappers/TradeMapper.xml"/>
    </mappers>
</configuration>

7、pom.xml:

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>

   <groupId>com.GetcharZp.MyBatisStudy</groupId>
   <artifactId>Mybatis</artifactId>
   <version>1.0-SNAPSHOT</version>
   <packaging>jar</packaging>

   <name>Mybatis</name>
   <url>http://maven.apache.org</url>

   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>

   <dependencies>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>3.8.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
       <version>3.4.1</version>
     </dependency>

     <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.38</version>
     </dependency>
   </dependencies>
 </project>