Spring JdbcTemplate的使用

Spring JdbcTemplate的使用

• ​​1 JdbcTemplate开发步骤​​
• ​​2 JdbcTemplate常用操作​​

• ​​2.1 更新、删除操作​​
• ​​2.2 查询操作​​

1 JdbcTemplate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 执行数据库操作

​① 导入spring-jdbc和spring-tx坐标基本包以及连接池数据库等坐标​

<dependency>
    <!--     导入spring坐标-->
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.0.5.RELEASE</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>
<dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.25</version>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.11</version>
    <scope>test</scope>
</dependency>

​② 创建数据库表和实体​

CREATE TABLE account (
  name VARCHAR ( 10 ),
  money DOUBLE 
)

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

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

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

    public String getName() {
        return name;
    }

    public String getMoney() {
        return money;
    }

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

​③ 创建JdbcTemplate对象：这里使用C3P0数据库连接池​

​在applicationContext.xml中配置数据源对象等：​

<?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">

    <!--    导入外部配置文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    
    <!--    数据源对象 ComboPooledDataSource-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

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

​④ 执行数据库操作​

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;

public class JdbcTemplateTest {
    @Test
    //测试spring产生jdbc模板
    public void test1() {
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        JdbcTemplate jdbcTemplate = app.getBean(JdbcTemplate.class);
        int row = jdbcTemplate.update("insert into account values (?,?)", "lisi", 1000);
        System.out.println(row);
    }
}

2 JdbcTemplate常用操作

​使用spring进行测试：​

1） 导入spring-test坐标
2）  @RunWith(SpringJUnit4ClassRunner.class)
3） @ContextConfiguration("classpath:applicationContext.xml")

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

2.1 更新、删除操作

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringTest {
    @Autowired  //注入
    private JdbcTemplate jdbcTemplate;

    @Test
    public void testUpdate() {
        jdbcTemplate.update("update account set money = ? where name = ?", 200, "lisi");
    }

    @Test
    public void testDelete() {
        jdbcTemplate.update("delete from account where name = ?", "lisi");
    }
}

2.2 查询操作

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringTest {
    @Autowired  //注入
    private JdbcTemplate jdbcTemplate;

    @Test
    public void testQueryOne() {
        //查询单个
        Account query = jdbcTemplate.queryForObject("select * from account where name = ?", new BeanPropertyRowMapper<Account>(Account.class), "黄蓉");
        System.out.println(query);
    }

    @Test
    public void testQueryAll() {
        //查询全部
        List<Account> accountList = jdbcTemplate.query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));
        System.out.println(accountList);
    }

    @Test
    public void testQueryAccount() {
        //查询总数
        Long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
        System.out.println(count);
    }
}