058-Spring JdbcTemplate

JdbcTemplate基本使用

01-JdbcTemplate基本使用-概述(了解)

JdbcTemplate是spring框架中提供的一个对象，是对原始繁琐的Jdbc API对象的简单封装。spring框架为我们提供了很多的操作模板类。

例如：操作关系型数据的JdbcTemplate和HibernateTemplate，操作nosql数据库的RedisTemplate，操作消息队列的JmsTemplate等等。

02-JdbcTemplate基本使用-开发步骤(理解)

导入spring-jdbc和spring-tx坐标
创建数据库表和实体
创建JdbcTemplate对象
执行数据库操作

03-JdbcTemplate基本使用-快速入门代码实现(应用)

导入 spring-jdbc 和 spring-tx 坐标

<?xml version="1.0" encoding="UTF-8"?>
<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.itheima</groupId>
  <artifactId>itheima_spring_jdbc</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>itheima_spring_jdbc Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>
  <dependencies>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.32</version>
    </dependency>
    <dependency>
      <groupId>c3p0</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.1.2</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.10</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.2.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.3</version>
    </dependency>
    <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>
  </dependencies>
</project>

创建数据库表和实体

package com.itheima.domain;

public class Account {

    private String name;
    private double money;

    public String getName() { return name; }

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

    public double getMoney() { return money; }

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

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

创建 JdbcTemplate 对象，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("root");

    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 values(?,?)", "tom", 5000);
    System.out.println(row);
}

04-JdbcTemplate基本使用-spring产生模板对象分析(理解)

我们可以将 JdbcTemplate 的创建权交给 Spring，将数据源 DataSource 的创建权也交给 Spring，在 Spring 容器内部将数据源 DataSource 注入到 JdbcTemplate 模版对象中，然后通过 Spring 容器获得 JdbcTemplate 对象来执行操作。配置如下：

<!--数据源对象-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
    <property name="jdbcUrl" value="jdbc:mysql:///test"></property>
    <property name="user" value="root"></property>
    <property name="password" value="root"></property>
</bean>

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

测试代码

@Test
//测试Spring产生jdbcTemplate对象
public void test2() throws PropertyVetoException {
    ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
    JdbcTemplate jdbcTemplate = app.getBean(JdbcTemplate.class);
    int row = jdbcTemplate.update("insert into account values(?,?)", "lisi", 5000);
    System.out.println(row);
}

06-JdbcTemplate基本使用-spring产生模板对象代码实现（抽取jdbc.properties）(应用)

将数据库的连接信息抽取到外部配置文件中，和spring的配置文件分离开，有利于后期维护

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

配置文件修改为:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">

    <!--加载jdbc.properties-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--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>

</beans>

07-JdbcTemplate基本使用-常用操作-更新操作(应用)

package com.itheima.test;

import com.itheima.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 JdbcTemplateCRUDTest {

    @Autowired
    private JdbcTemplate jdbcTemplate;
    
    //修改更新
    @Test
    public void testUpdate(){
        jdbcTemplate.update("update account set money=? where name=?",10000,"tom");
    }
    //删除
    @Test
    public void testDelete(){
        jdbcTemplate.update("delete from account where name=?","tom");
    }
}

08-JdbcTemplate基本使用-常用操作-查询操作(应用)

package com.itheima.test;

import com.itheima.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 JdbcTemplateCRUDTest {

    @Autowired
    private JdbcTemplate jdbcTemplate;
    
    //聚合查询
    @Test
    public void testQueryCount(){
        Long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
        System.out.println(count);
    }
    //查询一个
    @Test
    public void testQueryOne(){
        Account account = jdbcTemplate.queryForObject("select * from account where name=?", new BeanPropertyRowMapper<Account>(Account.class), "tom");
        System.out.println(account);
    }
    //查询所有
    @Test
    public void testQueryAll(){
        List<Account> accountList = jdbcTemplate.query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));
        System.out.println(accountList);
    }
}

09-JdbcTemplate基本使用-知识要点(理解，记忆)

导入spring-jdbc和spring-tx坐标
创建数据库表和实体

创建JdbcTemplate对象

1 2	`JdbcTemplate jdbcTemplate = newJdbcTemplate(); jdbcTemplate.setDataSource(dataSource);`

执行数据库操作
- 更新操作：jdbcTemplate.update (sql,params)
- 查询操作：
  jdbcTemplate.query (sql,Mapper,params)
  jdbcTemplate.queryForObject(sql,Mapper,params)

Java

#Java

058-Spring JdbcTemplate

https://flepeng.github.io/021-Java-01-course-058-Spring-JdbcTemplate/

作者

Lepeng

发布于

2020年2月2日

许可协议

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