Empezando con Spring- JdbcTemplate

1.1 Descripción básica

JdbcTemplate es una clase de plantilla proporcionada por Spring, que encapsula jdbc. Utilizado para apoyar el funcionamiento de la capa de persistencia, sus características son: simple y conveniente。

1.2 Directorio de proyectos

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pom.xml

<!--依赖版本-->
<properties>
    <!-- spring版本 -->
    <spring.version>5.0.2.RELEASE</spring.version>
</properties>

<!--spring jdbc依赖-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>${spring.version}</version>
    <!--lombok插件-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.16</version>
    </dependency>
</dependency>

1.3 Estructura de la tabla de datos SQL

-- 创建账户表
create table account(
	id int primary key auto_increment,
	name varchar(40),
	money float
)ENGINE=InnoDB character set utf8 collate utf8_general_ci;

-- 初始化新增三个账户
insert into account(name,money) values('kebe',1000);
insert into account(name,money) values('curry',1500);
insert into account(name,money) values('james',2000);

select * from account;

1.4 Ejemplo de código

Manera tradicional

package cn.guardwhy.jdbc;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

/**
 * spring JdbcTemplate入门案例
 */
public class JdbcTemplateDemo {
    
    
    public static void main(String[] args) {
    
    
        // 1.创建JdbcTemplate对象
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        // 2.设置数据源对象
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://127.0.0.1:3306/spring");
        dataSource.setUsername("root");
        dataSource.setPassword("root");

        jdbcTemplate.setDataSource(dataSource);
        // 3.添加账户信息
        jdbcTemplate.update("insert into account(name,money) values('Duncan',2500)");
    }
}

Manera del COI de lograr

bean.xml

<?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">

    <!--配置JdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <!--注入数据源对象-->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置数据源对象-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!--注入连接数据库-->
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/spring"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>
</beans>

Gestión de IOC JdbcTemplate

package cn.guardwhy.jdbc;

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

/**
 * spring JdbcTemplate入门案例
 */
public class JdbcTemplateDemo {
    
    
    public static void main(String[] args) {
    
    
        // 1.加载spring配置文件,创建spring IOC容器
        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:bean.xml");
        // 2.从spring IOC容器中,获取JdbcTemplate
        JdbcTemplate jdbcTemplate = (JdbcTemplate) context.getBean("jdbcTemplate");
        // 3.添加账户信息
        jdbcTemplate.update("insert into account(name,money) values('候大利',3500)");
    }
}