1.JdbcTemplate的开发步骤

        <1>导入spring-jdbc和spring-tx坐标

        <2>创建数据库表和实体

        <3>创建JdbcTemplate对象

        <4>执行数据库

2.JdbcTemplate快速入门

        <1>导入坐标

        

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>

        <2>创建实体类和表

package com.lin.domain;

public class Account {
    private String name;
    private double money;

    public Account() {
    }

    public Account(String name, double money) {
        this.name = name;
        this.money = money;
    }

    public String getName() {
        return name;
    }

    public double getMoney() {
        return money;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setMoney(double money) {
        this.money = money;
    }

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

 <3>创建jdbcTemplate对象

<4>执行数据库操作

@Test
    //测试JdbcTemplate开发步骤
    public void test1() throws PropertyVetoException {


//        创建数据源对象
        ComboPooledDataSource dataSource=new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
        dataSource.setUser("root");
        dataSource.setPassword("123456");
        JdbcTemplate jdbcTemplate=new JdbcTemplate();
        //设置数据源对象，知道数据库在哪
        jdbcTemplate.setDataSource(dataSource);
        //执行操作
        int row = jdbcTemplate.update("insert into account value (?,?)", "wu", 12);
        System.out.println(row);
    }

3.spring 产生jdbcTemplate对象

可以将数据源DateSource的创建权交给Spring，在Spring容器内部将数据源注入到模板中

spring容器加载外部properties文件时必须添加context命名空间

 <!--加载properties文件 添加context命名空间-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--配置数据源对象-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--jdbc模板对象-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>

4.crud操作

package com.lin.test;

import com.lin.domain.Account;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class CrudTest {
    @Autowired
//    测试谁注入谁
    private JdbcTemplate jdbcTemplate;
    @Test
    public void testUpdate(){
        int row = jdbcTemplate.update("update account set money=? where name=?", 100000, "ws");
        System.out.println(row);
    }
    @Test
    public void testDelete(){
        int row = jdbcTemplate.update("delete from account where name=?",  "ws");
        System.out.println(row);
    }
    
    //查询所有
    @Test
    public void testQueryAll(){
        List<Account> list = jdbcTemplate.query("select *from account", new BeanPropertyRowMapper<Account>(Account.class));
        System.out.println(list);
    }
    
    
    @Test
    //单个查询时返回一个对象
    public void testQueryOne(){
        Account account = jdbcTemplate.queryForObject("select * from account where name=?", new BeanPropertyRowMapper<Account>(Account.class), "wu");
        System.out.println(account);
    }
    
    //聚合查询
    @Test
    public void testQueryCount(){
        Long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
        System.out.println(count);
    }
}

5.小节