數據準備

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.example</groupId><artifactId>spring5</artifactId><version>1.0-SNAPSHOT</version><name>spring5</name><properties><maven.compiler.target>1.8</maven.compiler.target><maven.compiler.source>1.8</maven.compiler.source><junit.version>5.7.1</junit.version></properties><dependencies><dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter-api</artifactId><version>${junit.version}</version><scope>test</scope></dependency><dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter-engine</artifactId><version>${junit.version}</version><scope>test</scope></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.19</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.6</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>3.1.0</version></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.2.1</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.0.6.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.0.5.RELEASE</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.13.1</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>2.13.1</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.13.1</version></dependency><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.4</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.5</version></dependency></dependencies><build><plugins></plugins></build> </project>

1.1 JdbcTemplate概述

它是spring框架中提供的一個對象，是對原始繁瑣的Jdbc API對象的簡單封裝。spring框架為我們提供了很多的操作 模板類。例如:操作關系型數據的JdbcTemplate和HibernateTemplate，操作nosql數據庫的RedisTemplate，操 作消息隊列的JmsTemplate等等。

1.2 JdbcTemplate開發步驟

1 導入spring-jdbc和spring-tx坐標

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

2 創建數據庫表和實體
3 創建JdbcTemplate對象
4 執行數據庫操作

1.3 JdbcTemplate快速入門

在數據庫中準備好數據

?

public class test {//測試jdbc@Testpublic void test1() throws PropertyVetoException {//創建數據源對象ComboPooledDataSource dataSource = new ComboPooledDataSource();dataSource.setDriverClass("com.mysql.cj.jdbc.Driver");dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/day17");dataSource.setUser("root");dataSource.setPassword("12345678");JdbcTemplate jdbcTemplate = new JdbcTemplate();//設置數據源jdbcTemplate.setDataSource(dataSource);//執行語句int row = jdbcTemplate.update("insert into day22 value ( ?,? ,? ) ", null,"lisi", "123456");System.out.println(row);} }

1.4 Spring產生JdbcTemplate對象?

我們可以將JdbcTemplate的創建權交給Spring，將數據源DataSource的創建權也交給Spring，在Spring容器內部將 數據源DataSource注入到JdbcTemplate模版對象中，配置如下:

<?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"> <!-- 配置數據源對象--><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="com.mysql.cj.jdbc.Driver"/><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/day17"/><property name="user" value="root"/><property name="password" value="12345678"/></bean><!-- 配置JDBC模板對象--><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"/></bean></beans>

@Testpublic void test2(){ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");JdbcTemplate jdbcTemplate = app.getBean(JdbcTemplate.class);int row = jdbcTemplate.update("insert into day22 value ( ?,? ,? ) ", null,"mazi", "123456");System.out.println(row);}

繼續抽取配置applicationContext.xml文件，減少耦合性

• 創建jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/day17 jdbc.name=root jdbc.password=12345678

• 在applicationContext.xml 引入外部文件

<?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"> <!-- 引入外部文件--><context:property-placeholder location="jdbc.properties"/><!-- 配置數據源對象--><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="${jdbc.name}"/><property name="password" value="${jdbc.password}"/></bean><!-- 配置JDBC模板對象--><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"/></bean></beans>

?

package com.study.test;import com.study.doman.Users; 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;/*** @author Alina* @date 2022年03月30日 7:14 下午*/ //使用spring集成Junit進行測試 @RunWith(SpringJUnit4ClassRunner.class) //指定配置文件 @ContextConfiguration("classpath:applicationContext.xml") public class jdbcTemplateTest {//注入對象@Autowiredprivate JdbcTemplate jdbcTemplate;@Testpublic void test1(){int row = jdbcTemplate.update("update day22 set password = ? where username = ?", 123123, "tom");System.out.println(row);}@Testpublic void test2(){int row = jdbcTemplate.update("delete from day22 where username = ?", "tom");System.out.println(row);}//查詢全部@Testpublic void test3(){List<Users> User = jdbcTemplate.query("select * from day22", new BeanPropertyRowMapper<Users>(Users.class));System.out.println(User);}//查詢一個@Testpublic void test4(){Users user = jdbcTemplate.queryForObject("select * from day22 where username = ?", new BeanPropertyRowMapper<>(Users.class), "張三");System.out.println(user);}@Test//查詢行數public void test5(){Long user = jdbcTemplate.queryForObject("select count(*) from day22 where username = ?", Long.class, "張三");System.out.println(user);}}

?

總結

以上是生活随笔為你收集整理的spring框架(五)之JdbcTemplate基本使用的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。