使用JdbcTemplate的步骤
1、设置spring-jdbc和spring-tx的坐标(也就是导入依赖)
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< dependency >
< groupId >org.springframework</ groupId >
< artifactId >spring-jdbc</ artifactId >
< version >5.2.7.RELEASE</ version >
</ dependency >
< dependency >
< groupId >org.springframework</ groupId >
< artifactId >spring-tx</ artifactId >
< version >5.2.7.RELEASE</ version >
</ dependency >
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2、创建数据表和实体类
- 创建数据表的过程省略
- 创建实体类Account
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package com.jdbcTemplate.bean;
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 +
'}' ;
}
}
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3、创建数据源、JdbcTemplate对象
4、执行数据库操作
实现3、4步的方法提供以下三种
方法一:代码中直接配置数据源和数据对象
创建JdbcTemplate对象+执行jdbc语句
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//创建数据源对象
DriverManagerDataSource ds = new DriverManagerDataSource();
ds.setDriverClassName( "com.mysql.jdbc.Driver" );
ds.setUrl( "jdbc:mysql://localhost:3306/think" );
ds.setUsername( "root" );
ds.setPassword( "" );
//创建jdbcTemplate对象
JdbcTemplate jt = new JdbcTemplate();
//执行操作(插入操作)
jt.setDataSource(ds);
jt.execute( "insert into account(name,money)value('EVA',50000)" );
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方法二:在resources目录下配置xx.xml文件,对数据源、JdbcTemplate进行注入
配置xml文件
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<? 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:p = "http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- //配置数据源-->
< bean id = "dataSource" class = "org.springframework.jdbc.datasource.DriverManagerDataSource" >
< property name = "driverClassName" value = "com.mysql.jdbc.Driver" />
< property name = "url" value = "jdbc:mysql://localhost:3306/think" />
< property name = "username" value = "root" />
< property name = "password" value = "" />
</ bean >
<!-- //配置jdbcTemplate-->
< bean id = "jdbcTemplate" class = "org.springframework.jdbc.core.JdbcTemplate" >
< property name = "dataSource" ref = "dataSource" />
</ bean >
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使用配置操作数据库
编写test类测试
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//二、使用配置操作数据库
//1、获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext( "beans5.xml" );
//2、获取对象
JdbcTemplate jt = ac.getBean( "jdbcTemplate" ,JdbcTemplate. class );
//、执行操作
// jt.execute("insert into account(name,money)value ('Alice',2000)");
//保存
//jt.update("insert into account(name,money)value (?,?)","Eden",100);
//更新
// jt.update("update account set money=?,name=? where name=?",1000,"Kiroto","Eden");
//删除
//jt.update("delete from account where name =? and money =?","Kiroto",1000);
//查找
List<Account> list = jt.query( "select * from account where name =?" , new BeanPropertyRowMapper<Account>(Account. class ), "Eden" );
System.out.println(list.isEmpty()? "没有查找结果" :list.get( 0 ));
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方法三:使用接口实现
创建template接口和templateDAO接口实现类
接口
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package com.jdbcTemplate.test;
import com.jdbcTemplate.bean.Account;
public interface Template {
Account find(String name);
int update(Account account);
int delete(Account account);
int add(Account account);
}
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接口实现类
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package com.jdbcTemplate.test;
import com.jdbcTemplate.bean.Account;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import java.util.List;
public class TemplateDAO implements Template {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this .jdbcTemplate = jdbcTemplate;
}
public Account find(String name) { //查找
List<Account> list = jdbcTemplate.query( "select * from account where name=?" ,
new BeanPropertyRowMapper<Account>(Account. class ),name);
return list.isEmpty()? null :list.get( 0 );
}
public int update(Account account) { //更新
return jdbcTemplate.update( "update account set money=? where name=?" ,
account.getMoney(),account.getName());
}
public int delete(Account account) { //删除
return jdbcTemplate.update( "delete from account where name =?" ,account.getName());
}
public int add(Account account) { //添加
return jdbcTemplate.update( "insert into account(name ,money)value (?,?)" ,account.getName(),account.getMoney());
}
}
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在测试之前,因为多了一个接口实现类,除了数据源和jdbcTemplate之外,应当在xml配置文件中多配置一个TemplateDAO
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<!-- 配置账户的持久层-->
< bean id = "templateDAO" class = "com.jdbcTemplate.test.TemplateDAO" >
< property name = "jdbcTemplate" ref = "jdbcTemplate" />
</ bean >
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编写测试类进行测试
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import com.jdbcTemplate.bean.Account;
import com.jdbcTemplate.test.Template;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class mytest {
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext( "beans6.xml" );
Template tp = ac.getBean( "templateDAO" ,Template. class ); //注意对比方法二的不同
Account account = tp.find( "Lily" );
System.out.println(account.toString());
}
}
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原文链接:https://blog.csdn.net/L_GRAND_ORDER/article/details/107449883