Spring04——Spring操作JdbcTemplate进行JDBC操作

Spring进行JDBC操作

前言：传统的JDBC操作非常的繁琐,为了使JDBC更加便于使用,Spring整合了JDBC，以此建立一个JDBC存取框架: JdbcTemplate

1.开发环境

基本开发环境： 1.JDK:-8u101-windows-x64 2.Mysql:5.5 3.Maven配置

注意事项：1.jdk-9.0.4会报错：空指针异常尽量用jdk1.8

2.如果用idea2018或以上版本记得加上pom.xml的插件

pom.xml配置

    4.0.0
    
    org.example
    spring_jdbc_zsgc
    pom
    1.0-SNAPSHOT
    
    
        
            mysql
            mysql-connector-java
            5.1.32
        
        
            junit
            junit
            4.12
            test
        
        
            org.springframework
            spring-jdbc
            5.0.2.RELEASE
        
        
            org.springframework
            spring-context
            5.0.2.RELEASE
        
        
            c3p0
            c3p0
            0.9.1.2
        
        
            org.aspectj
            aspectjweaver
            1.8.7
        
        
            mysql
            mysql-connector-java
            5.1.32
        
    
    
    
    
        UTF-8
        1.7
        1.7
    

    
    
        
            
            
                org.apache.maven.plugins
                maven-compiler-plugin
                3.2
                
                    1.8
                    1.8
                    UTF-8
                
            
            
            
                org.apache.tomcat.maven
                tomcat7-maven-plugin
                2.2
                
                    
                    utf-8
                    80
                    /
                
            
        
    

2.Mysql库名表名

2.1数据库名>数据库字段

-- 建库
create database travel;
-- 建表
create table key_table(
    id         int  not null,
    `name`  varchar(20),
    dates     varchar(20)
);

3.创建包以及接口和类

分层思想：

1. com.xxx

   1. dao(接口层)

      • keyTableDao(接口)

        • impl

          • keyTableDaoImpl(实现类)

   2. pojo

      1. keyTable(实体类)

   3. service(服务层)

      • keyTableService(接口)

        • impl
        • keyTableServiceImpl

4.配置beans.xml以及properties

​ beans.xml(配置文件)

​ jdbc.properties(属性文件)

jdbc.driverClass = com.mysql.jdbc.Driver
jdbc.jdbcUrl = jdbc:mysql://localhost:3306/travel
jdbc.user = root
jdbc.password = root

​ 注意事项：路径、账号、密码请用自己的。

---

5.实现dao层

5.1pojo

package com.xxx.pojo;

public class keyTable {

    private int id;
    private String name;
    private String dates;

    public keyTable() {

    }

    public keyTable(int id, String name, String dates) {
        this.id = id;
        this.name = name;
        this.dates = dates;
    }
    
    @Override
    public String toString() {
        return "keyTable{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", dates='" + dates + '\'' +
                '}';
    }

    // get set
    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 String getDates() {
        return dates;
    }

    public void setDates(String dates) {
        this.dates = dates;
    }
}

package com.xxx.dao;

import com.xxx.pojo.keyTable;

import java.util.List;

// 接口 
public interface keyTableDao {
    /*
    增加
    依据id删除
    修改
    依据id查询
     */     
     int AddTable(keyTable keyTable);
     
     int DeleteByIdTable(int id);
     
     int UpdateTable(keyTable keyTable);
     
     List FindById(int id);

}
// 实现

package com.xxx.dao.impl;

import com.xxx.dao.keyTableDao;
import com.xxx.pojo.keyTable;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;

import javax.annotation.Resource;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

@Repository("keyTableDao")
public class keyTableDaoImpl implements keyTableDao {


    @Resource(name = "JdbcTemplate")
    private JdbcTemplate template;


    @Override
    public int AddTable(keyTable keyTable) {
        String sql = "insert into key_table values(?,?,?)";
        int result = template.update(sql, keyTable.getId(), keyTable.getName(), keyTable.getDates());
        return result;
    }

    @Override
    public int DeleteByIdTable(int id) {
        String sql = "delete from key_table where id = ?";
        int result = template.update(sql,id);
        return result;
    }

    @Override
    public int UpdateTable(keyTable keyTable) {
        String name = keyTable.getName();
        int id = keyTable.getId();
        String sql =  "update key_table set name = ? where id = ?";
        int result = template.update(sql, name, id);
        return result;
    }

    @Override
    public List FindById(int id) {
        String sql = "select * from key_table where id = ?";
        List query = template.query(sql, new RowMapper() {
            @Override
            public keyTable mapRow(ResultSet rs, int rowNum) throws SQLException {
                keyTable k = new keyTable();
                k.setId(rs.getInt(1));
                k.setName(rs.getString(2));
                k.setDates(rs.getString(3));
                return k;
            }
        },id);

        return query;
    }
    
}

---

6.实现service层

package com.xxx.service;

import com.xxx.pojo.keyTable;

import java.util.List;
// 接口 
public interface keyTableService {

     /*
    增加
    依据id删除
    修改
    依据id查询
     */

     int AddTable(keyTable keyTable);
     int DeleteByIdTable(int id);
     int UpdateTable(keyTable keyTable);
     List FindById(int id);

}


package com.xxx.service.impl;

import com.xxx.dao.keyTableDao;
import com.xxx.pojo.keyTable;
import com.xxx.service.keyTableService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
// 实现类
@Service("keyTableService") // spring帮我创建的实现类
public class keyTableServiceImpl implements keyTableService{

    @Autowired // 注入bean
    private keyTableDao keyTableDao;


    @Override
    public int AddTable(keyTable keyTable) {
        int result = keyTableDao.AddTable(keyTable);
        return result;
    }

    @Override
    public int DeleteByIdTable(int id) {
        int result = keyTableDao.DeleteByIdTable(id);
        return result;
    }

    @Override
    public int UpdateTable(keyTable keyTable) {
        int result = keyTableDao.UpdateTable(keyTable);
        return result;
    }

    @Override
    public List FindById(int id) {
        List list = keyTableDao.FindById(id);
        return list;
    }

}

7.测试jdcb是否成功

package com.test;

import com.xxx.pojo.keyTable;
import com.xxx.service.keyTableService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestKeyService {


    // 增加
    @Test
    public void AddTableTest(){
        ApplicationContext app = new ClassPathXmlApplicationContext("beans.xml");
        keyTableService keyTableService = (keyTableService) app.getBean("keyTableService");
        keyTable k = new keyTable();
        k.setId(3);
        k.setName("我是被增加的对象");
        k.setDates("2021-12-23");
        int result = keyTableService.AddTable(k);
        if (result > 0){
            System.out.println("执行成功");
        } else {
            System.out.println("失败了");
        }
    }

    // 依据id删除
    @Test
    public void DeleteTableTest(){
        ApplicationContext app = new ClassPathXmlApplicationContext("beans.xml");
        keyTableService keyTableService = (keyTableService) app.getBean("keyTableService");
        int result = keyTableService.DeleteByIdTable(111);
        if (result > 0){
            System.out.println("执行成功");
        } else {
            System.out.println("失败了");
        }
    }


    // 修改
    @Test
    public void UpdateTableTest(){
        ApplicationContext app = new ClassPathXmlApplicationContext("beans.xml");
        keyTableService keyTableService = (keyTableService) app.getBean("keyTableService");
        keyTable keyTable = new keyTable();
        keyTable.setName("修改了");
        keyTable.setId(17);
        int result = keyTableService.UpdateTable(keyTable);
        if (result > 0){
            System.out.println("执行成功");
        } else {
            System.out.println("失败了");
        }
    }

    // 依据id查询
    @Test
    public void FindAddTableTest(){
        ApplicationContext app = new ClassPathXmlApplicationContext("beans.xml");
        keyTableService keyTableService = (keyTableService) app.getBean("keyTableService");
        List list = keyTableService.FindById(1);
        for (keyTable k:list) {
            System.out.println(k);
        }
    }
        
}

完！