spring Mybatis

DataBase

show create table account

CREATE TABLE `account` (
  `actno` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
  `balance` int(11) DEFAULT NULL,
  PRIMARY KEY (`actno`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

 

 

 pom.xml

    4.0.0

    com.wsd
    spring-mybatis
    1.0-SNAPSHOT
    jar

    
        
            org.springframework
            spring-context
            6.0.6
        
        
            org.springframework
            spring-jdbc
            6.0.6
        
        
            mysql
            mysql-connector-java
            8.0.30
        
        
            org.mybatis
            mybatis
            3.5.11
        
        
            org.mybatis
            mybatis-spring
            3.0.1
        
        
            com.alibaba
            druid
            1.2.13
        
        
            junit
            junit
            4.13.2
            test
        
    

    
        
            
                org.apache.maven.plugins
                maven-compiler-plugin
                3.1
                
                    17
                    17
                
            
        
    

pojo （Plain Old Java Object）

package com.wsd.bank.pojo;

/**
 * @program: spring_learn
 * @description:
 * @author: Mr.Wang
 * @create: 2023-06-11 06:41
 **/
public class Account {
    private String actno;
    private Double balance;

    @Override
    public String toString() {
        return "Account{" +
                "actno='" + actno + '\'' +
                ", balance=" + balance +
                '}';
    }

    public Account() {
    }

    public Account(String actno, Double balance) {
        this.actno = actno;
        this.balance = balance;
    }

    public String getActno() {
        return actno;
    }

    public void setActno(String actno) {
        this.actno = actno;
    }

    public Double getBalance() {
        return balance;
    }

    public void setBalance(Double balance) {
        this.balance = balance;
    }
}

mapper interface

package com.wsd.bank.mapper;

import com.wsd.bank.pojo.Account;

import java.util.List;

/**
 * @program: spring_learn
 * @description:
 * @author: Mr.Wang
 * @create: 2023-06-11 07:21
 **/
public interface AccountMapper {

    /**
     * 保存账户
     * @param account
     * @return
     */
    int insert(Account account);

    /**
     * 根据账号删除账户
     * @param actno
     * @return
     */
    int deleteByActno(String actno);

    /**
     * 修改账户
     * @param account
     * @return
     */
    int update(Account account);

    /**
     * 根据账号查询账户
     * @param actno
     * @return
     */
    Account selectByActno(String actno);

    /**
     * 获取所有账户
     * @return
     */
    List selectAll();
}

mapper.xml 与mapper接口同名且同目录下 

 

mapper

    
        insert into account values(#{actno}, #{balance})
    
    
        delete from account where actno = #{actno}
    
    
        update account set balance = #{balance} where actno = #{actno}
    
    
        select * from account where actno = #{actno}
    
    
        select * from account
    

service接口

package com.wsd.bank.service;

import com.wsd.bank.pojo.Account;

import java.util.List;

/**
 * @program: spring_learn
 * @description:
 * @author: Mr.Wang
 * @create: 2023-06-11 10:40
 **/
public interface AccountService {
    /**
     * 开户
     * @param act
     * @return
     */
    int save(Account act);

    /**
     * 根据账号销户
     * @param actno
     * @return
     */
    int deleteByActno(String actno);

    /**
     * 修改账户
     * @param act
     * @return
     */
    int update(Account act);

    /**
     * 根据账号获取账户
     * @param actno
     * @return
     */
    Account getByActno(String actno);

    /**
     * 获取所有账户
     * @return
     */
    List getAll();

    /**
     * 转账
     * @param fromActno
     * @param toActno
     * @param money
     */
    void transfer(String fromActno, String toActno, double money);
}

service接口实现类

package com.wsd.bank.service.impl;

import com.wsd.bank.mapper.AccountMapper;
import com.wsd.bank.pojo.Account;
import com.wsd.bank.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @program: spring_learn
 * @description:
 * @author: Mr.Wang
 * @create: 2023-06-11 10:46
 **/
@Service("accountService")
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountMapper accountMapper;

    @Override
    public int save(Account act) {
        return accountMapper.insert(act);
    }

    @Override
    public int deleteByActno(String actno) {
        return accountMapper.deleteByActno(actno);
    }

    @Override
    public int update(Account act) {
        return accountMapper.update(act);
    }

    @Override
    public Account getByActno(String actno) {
        return accountMapper.selectByActno(actno);
    }

    @Override
    public List getAll() {
        return accountMapper.selectAll();
    }

    @Override
    public void transfer(String fromActno, String toActno, double money) {
        Account fromAct = accountMapper.selectByActno(fromActno);
        if (fromAct.getBalance() < money) {
            throw new RuntimeException("余额不足");
        }
        Account toAct = accountMapper.selectByActno(toActno);
        fromAct.setBalance(fromAct.getBalance() - money);
        toAct.setBalance(toAct.getBalance() + money);
        int count = accountMapper.update(fromAct);
        count += accountMapper.update(toAct);
        if (count != 2) {
            throw new RuntimeException("转账失败");
        }
    }
}

 

jdbc.properties配置文件 

放在类的根路径下

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/myspring
jdbc.username=root
jdbc.password=root

mybatis-config.xml配置文件
放在类的根路径下，只开启日志，其他配置到spring.xml中。

spring.xml配置文件

test:

package com.wsd;

import com.wsd.bank.service.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @program: spring_learn
 * @description:
 * @author: Mr.Wang
 * @create: 2023-06-11 13:58
 **/
public class springmybatistest {

    @Test
    public void testSM(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
        AccountService accountService = applicationContext.getBean("accountService", AccountService.class);
        try {
            accountService.transfer("001", "002", 10000.0);
            System.out.println("转账成功");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("转账失败");
        }
    }

}

Before testing

After testing

 

"C:\Program Files\Java\jdk-17\bin\java.exe" -ea -Didea.test.cyclic.buffer.size=1048576 -Didea.launcher.port=53095 "-Didea.launcher.bin.path=C:\Minecloud\IDEA_2019\IntelliJ IDEA 2019.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Minecloud\IDEA_2019\IntelliJ IDEA 2019.1\lib\idea_rt.jar;C:\Minecloud\IDEA_2019\IntelliJ IDEA 2019.1\plugins\junit\lib\junit-rt.jar;C:\Minecloud\IDEA_2019\IntelliJ IDEA 2019.1\plugins\junit\lib\junit5-rt.jar;C:\Minecloud\IDEA_workspace\spring_learn\springmybatis\target\test-classes;C:\Minecloud\IDEA_workspace\spring_learn\springmybatis\target\classes;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-context\6.0.6\spring-context-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-aop\6.0.6\spring-aop-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-beans\6.0.6\spring-beans-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-core\6.0.6\spring-core-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-jcl\6.0.6\spring-jcl-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-expression\6.0.6\spring-expression-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-jdbc\6.0.6\spring-jdbc-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\springframework\spring-tx\6.0.6\spring-tx-6.0.6.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\mysql\mysql-connector-java\8.0.30\mysql-connector-java-8.0.30.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\com\google\protobuf\protobuf-java\3.19.4\protobuf-java-3.19.4.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\mybatis\mybatis\3.5.11\mybatis-3.5.11.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\mybatis\mybatis-spring\3.0.1\mybatis-spring-3.0.1.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\com\alibaba\druid\1.2.13\druid-1.2.13.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\junit\junit\4.13.2\junit-4.13.2.jar;C:\Minecloud\maven_3.9\apache-maven-3.9.0\repo\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar" com.intellij.rt.execution.application.AppMainV2 com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.wsd.springmybatistest,testSM
Logging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter.
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@45efc20d] was not registered for synchronization because synchronization is not active
6月 11, 2023 2:17:03 下午 com.alibaba.druid.support.logging.JakartaCommonsLoggingImpl info
信息: {dataSource-1} inited
JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@32057e6] will not be managed by Spring
==>  Preparing: select * from account where actno = ?
==> Parameters: 001(String)
<==    Columns: actno, balance
<==        Row: 001, 50000
<==      Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@45efc20d]
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@62f87c44] was not registered for synchronization because synchronization is not active
JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@32057e6] will not be managed by Spring
==>  Preparing: select * from account where actno = ?
==> Parameters: 002(String)
<==    Columns: actno, balance
<==        Row: 002, 0
<==      Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@62f87c44]
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@525d79f0] was not registered for synchronization because synchronization is not active
JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@32057e6] will not be managed by Spring
==>  Preparing: update account set balance = ? where actno = ?
==> Parameters: 40000.0(Double), 001(String)
<==    Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@525d79f0]
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@327120c8] was not registered for synchronization because synchronization is not active
JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@32057e6] will not be managed by Spring
==>  Preparing: update account set balance = ? where actno = ?
==> Parameters: 10000.0(Double), 002(String)
<==    Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@327120c8]
转账成功

Process finished with exit code 0