标签:事务 name spring springframework id User org 声明 public
涉及的依赖项:
<dependencies> <!-- https://mvnrepository.com/artifact/org.springframework/spring-context --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.3.20</version> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>RELEASE</version> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13.2</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>5.3.20</version> <scope>compile</scope> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.21</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.5</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>5.2.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.3.20</version> <scope>compile</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13.2</version> <scope>compile</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>5.3.20</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>5.3.20</version> </dependency> </dependencies>
查看依赖UML图
查看MySQL的表:
创建对应的User类:
package cn.cdulm.entity; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; import java.util.Objects; @Component public class User { private Integer id; private String name; private Integer balance; @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", balance=" + balance + '}'; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; User user = (User) o; return Objects.equals(id, user.id) && Objects.equals(name, user.name) && Objects.equals(balance, user.balance); } @Override public int hashCode() { return Objects.hash(id, name, balance); } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getBalance() { return balance; } public void setBalance(Integer balance) { this.balance = balance; } }
关于数据库参数的资源文件:
spring.xml配置文件:
<?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 https://www.springframework.org/schema/context/spring-context.xsd"> <!--扫描包--> <context:component-scan base-package="cn.cdulm"></context:component-scan> <!--配置JDBCTemplate Bean组件--> <bean class="org.springframework.jdbc.core.JdbcTemplate" id="jdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- <!–使用另一个Bean的属性赋值–>--> <!-- <bean class="cn.cdulm.entity.User" id="user">--> <!-- <property name="name" value="#{person.getName()}"></property>--> <!-- </bean>--> <!-- <bean class="cn.cdulm.entity.Person" id="person">--> <!-- </bean>--> <!--配置连接池--> <bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource"> <property name="username" value="${mysql.username}"></property> <property name="password" value="${mysql.password}"></property> <property name="url" value="${mysql.url}"></property> <property name="driverClassName" value="${mysql.driverClassName}"></property> </bean> <!--引入配置文件--> <context:property-placeholder location="db.properties"></context:property-placeholder> </beans>
测试方法:
package test; import cn.cdulm.entity.User; import com.alibaba.druid.pool.DruidDataSource; import org.junit.Before; import org.junit.Test; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import java.util.List; public class JDBCTest { ClassPathXmlApplicationContext ioc; @Before public void before(){ ioc = new ClassPathXmlApplicationContext("classpath:spring.xml"); } /** * 查看连接池 */ @Test public void f1(){ DruidDataSource bean = ioc.getBean(DruidDataSource.class); System.out.println(bean); } /** * 查询数据库表的行数 */ @Test public void f2(){ JdbcTemplate jt = ioc.getBean(JdbcTemplate.class); Long count = jt.queryForObject("select count(*) from account", Long.class); System.out.println(count); } /** * 查询实体类 */ @Test public void f3(){ JdbcTemplate jt = ioc.getBean(JdbcTemplate.class); // 查询单行记录(必须要属性名与数据库字段名一一对应相同) // User bean = jt.queryForObject("select * from account where id=1", new BeanPropertyRowMapper<>(User.class)); // System.out.println(bean); // 如果字段名与属性名不一样时,可以获取数据库中的对应字段名的值为对象赋值 User bean = jt.queryForObject("select * from account where id=1", (rs, i) -> { // rs就是查询数据库后的结果集 User user = new User(); user.setId(rs.getInt("id")); // rs.getInt()获取查询结果中的id // rs.next(); user.setName(rs.getString("name")); // 获取数据库中的name return user; }); System.out.println(bean); // User{id=1, name='zs', balance=null} } /** * 查询结果为List<> */ @Test public void f4(){ JdbcTemplate jt = ioc.getBean(JdbcTemplate.class); List<User> bean = jt.query("select * from account",new BeanPropertyRowMapper<>(User.class)); System.out.println(bean); } }
f4()查询结果:
和数据库中的数据一样,没啥问题。
增加数据:
修改数据:
删除数据:
标签:事务,name,spring,springframework,id,User,org,声明,public 来源: https://www.cnblogs.com/0099-ymsml/p/16338821.html
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