JdbcTemplate概述和测试

JdbcTemplate概述

他是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HivernateTenplate，操作nosql数据库的RedisTemplate，操作消息队列的JmsTemplate等

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

数据库中account表

pom.xml中

 <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>

测试java中实体类中

package test;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.junit.Test;
import org.springframework.jdbc.core.JdbcTemplate;

import java.beans.PropertyVetoException;

public class JdbcTemplateTest {

    @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");
        //位置为本地，3306端口，test数据库
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
        //用户名
        dataSource.setUser("root");
        //用户密码
        dataSource.setPassword("123456");
        JdbcTemplate jdbcTemplate=new JdbcTemplate();
        //设置数据源对象，知道数据库在哪里
        jdbcTemplate.setDataSource(dataSource);
        //执行操作
        int row = jdbcTemplate.update("insert into account value(?,?)", "tom", 5000);
        System.out.println(row);
    }

}

domain包下的account类下

package 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 +
                '}';
    }
}

运行结果：

数据库中的test数据库，account表

Spring产生JdbcTemplate对象

测试插入

仔细看，这些都是参数注入（用了setXxx。。），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DateSource注入到JdbcTemplate模版对象中，配置如下：

在test测试包下创建一系列

在applicationContext1.xml下

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

<!--数据源对象-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test"/>
        <property name="user" value="root"/>
        <property name="password" value="123456"/>
    </bean>
<!--    jdbc模版对象-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>

pom.xml中

<?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>org.example</groupId>
    <artifactId>javaMaven02</artifactId>
    <version>1.0-SNAPSHOT</version>
    <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>4.11</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-context</artifactId>
            <version>5.0.5.RELEASE</version>
            <scope>compile</scope>
        </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>
<!-- 导入json相关依赖       -->
        <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>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>

JdbcTemplateTest类下

public class JdbcTemplateTest {
    @Test
  //测试Spring产生jdbcTemplate对象
    public void test2() throws PropertyVetoException {
        ApplicationContext app=new ClassPathXmlApplicationContext("applicationContext1.xml");
        JdbcTemplate jdbcTemplate=app.getBean(JdbcTemplate.class);
        int row = jdbcTemplate.update("insert into account value(?,?)", "KC", 50000);
        System.out.println(row);

    }
}

运行结果：

数据库中的变化