Spring-jdbcTemplate-配置数据库连接池,配置文件方式beans.xml

1、jdbc.properties

java 复制代码
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql:///studb
jdbc.user=root
jdbc.pwd=123456

2、beans.xml

XML 复制代码
<?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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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 http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--导入jdbc.properties-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--创建数据源连接处-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.pwd}"/>
        <property name="initialSize" value="5"/>
        <property name="maxWait" value="5000"/>
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

3、Student.java

java 复制代码
package com.atguigu.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
    private Integer id;
    private String name;
    private String gender;
    private Integer age;
    private String classBean;
}

4、JdbcTemplateTest.java

java 复制代码
package com.atguigu;
import com.atguigu.pojo.Student;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
import javax.sql.DataSource;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
@SpringJUnitConfig(locations = "classpath:beans.xml")
public class JdbcTemplateTest {

    @Autowired
    private DataSource dataSource;

    @Autowired
    private JdbcTemplate jdbcTemplate;

    //测试连接数据库
    @Test
    public void TestConnection() throws SQLException {
        System.out.println(dataSource.getConnection()==null?"连接失败":"连接成功");//连接成功
    }

    //测试插入操作
    @Test
    public void InsertTest() {
        Student s1= new Student(0, "阿碧", "女", 18, "Java1班");
        String sql = "insert into students values(0,?,?,?,?)";
        jdbcTemplate.update(sql, s1.getName(), s1.getGender(), s1.getAge(), s1.getClassBean());
    }

    //演示删除学生信息测试方法
    @Test
    public void DeleteTest() {
        String sql = "delete from students where id=?";
        jdbcTemplate.update(sql, 0);
    }

    //演示查询单个字段值
    @Test
    public void QueryTest() {
        String sql = "select name from students where id=?";
        String name = jdbcTemplate.queryForObject(sql, String.class, 8);
        System.out.println("name = " + name);//name = 吴十
    }

    //演示查询单个实体对象
    @Test
    public void QueryObjectTest() {
        String sql = "select * from students where id=?";
        Student s = jdbcTemplate.queryForObject(sql, new RowMapper<Student>() {
            @Override
            public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
                return new Student(rs.getInt(1), rs.getString(2), rs.getString(3), rs.getInt(4), rs.getString(5));
            }
        }, 8);
        System.out.println("s = " + s);//s = Student(id=8, name=吴十, gender=男, age=19, classBean=高中二班)
    }
    //演示查询单个实体对象
    @Test
    public void QueryObjectLambdaTest() {
        String sql = "select * from students where id=?";
        Student s = jdbcTemplate.queryForObject(sql,(rs,rowNum)->
            new Student(rs.getInt(1), rs.getString(2), rs.getString(3), rs.getInt(4), rs.getString(5))
                , 8);
        System.out.println("s = " + s);//s = Student(id=8, name=吴十, gender=男, age=19, classBean=高中二班)
    }


    //演示查询实体对象列表
    @Test
    public void QueryObjectListTest() {
        String sql = "select id,name,gender,age,class as classBean from students";
        List<Student> studentList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<>(Student.class));
        studentList.forEach(System.out::println);
        //Student(id=1, name=张三, gender=男, age=20, classBean=高中一班)
        //Student(id=2, name=李四, gender=男, age=19, classBean=高中二班)
        //Student(id=3, name=王五, gender=女, age=18, classBean=高中一班)
        //Student(id=4, name=赵六, gender=女, age=20, classBean=高中三班)
        //Student(id=5, name=刘七, gender=男, age=19, classBean=高中二班)
        //Student(id=6, name=陈八, gender=女, age=18, classBean=高中一班)
        //Student(id=7, name=杨九, gender=男, age=20, classBean=高中三班)
        //Student(id=8, name=吴十, gender=男, age=19, classBean=高中二班)
    }
}

5、studb.sql

sql 复制代码
create database studb;

use studb;

CREATE TABLE students (
  id INT PRIMARY KEY,
  name VARCHAR(50) NOT NULL,
  gender VARCHAR(10) NOT NULL,
  age INT,
  class VARCHAR(50)
);

INSERT INTO students (id, name, gender, age, class)
VALUES
  (1, '张三', '男', 20, '高中一班'),
  (2, '李四', '男', 19, '高中二班'),
  (3, '王五', '女', 18, '高中一班'),
  (4, '赵六', '女', 20, '高中三班'),
  (5, '刘七', '男', 19, '高中二班'),
  (6, '陈八', '女', 18, '高中一班'),
  (7, '杨九', '男', 20, '高中三班'),
  (8, '吴十', '男', 19, '高中二班');

6、父工程pom.xml

XML 复制代码
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>6.0.6</spring.version>
        <junit.version>5.3.1</junit.version>
        <lombok.version>1.18.20</lombok.version>
        <mysql.version>8.0.25</mysql.version>
        <druid.version>1.2.8</druid.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>

            <dependency>
                <groupId>org.junit.jupiter</groupId>
                <artifactId>junit-jupiter-api</artifactId>
                <version>${junit.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${spring.version}</version>
                <scope>test</scope>
            </dependency>

            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>

            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>

        </dependencies>
    </dependencyManagement>

7、子工程pom.xml

XML 复制代码
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>


spring-jdbc-template是Spring框架中提供的一个JDBC模板,简化了开发者对JDBC API的调用。你可以使用它来执行各种JDBC操作,如查询、插入、更新、删除等。下面是使用spring-jdbc-template的步骤:

  1. 添加spring-jdbc依赖

首先需要在Maven或Gradle项目中添加spring-jdbc依赖。

XML 复制代码
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.3.6</version>
</dependency>
 
  1. 配置数据源

配置使用的数据源,在Spring配置文件中添加以下配置。

XML 复制代码
<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/test"/>
    <property name="username" value="root"/>
    <property name="password" value="root"/>
</bean>
  1. 配置JdbcTemplate

配置JdbcTemplate,配置JdbcTemplate时需要注入数据源。

XML 复制代码
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"/>
</bean>
  1. 使用JdbcTemplate

最后,你可以在Java代码中使用JdbcTemplate。

java 复制代码
@Autowired
private JdbcTemplate jdbcTemplate;

public void insert(User user) {
    String sql = "INSERT INTO users (name, age) VALUES (?, ?)";
    jdbcTemplate.update(sql, user.getName(), user.getAge());
}

以上是使用spring-jdbc-template的步骤,你可以根据项目的需要来调整代码实现,具体的JDBC操作方法可以在Spring的官方文档中查找。

相关推荐
pwzs2 小时前
Spring MVC 执行流程全解析:从请求到响应的七步走
java·后端·spring·spring mvc
LCY1333 小时前
spring security +kotlin 实现oauth2.0 认证
java·spring·kotlin
王有品4 小时前
Spring MVC 一个简单的多文件上传
java·spring·mvc
小可爱的大笨蛋5 小时前
Spring AI 开发 - 快速入门
java·人工智能·spring
V功夫兔7 小时前
Spring_MVC 高级特性详解与实战应用
java·经验分享·笔记·spring
小厂永远得不到的男人11 小时前
Spring Cache修仙指南:从青铜到王者的缓存通关秘籍
后端·spring·面试
V功夫兔12 小时前
Spring_MVC 快速入门指南
java·笔记·spring·springmvc
hello_ejb312 小时前
聊聊Spring AI Alibaba的FeiShuDocumentReader
人工智能·python·spring
一只鹿鹿鹿13 小时前
【测试文档】项目测试文档,测试管理规程,测试计划,测试文档模版,软件测试报告书(Word)
数据库·后端·spring·单元测试
jstart千语13 小时前
【SpringBoot】HttpServletRequest获取使用及失效问题(包含@Async异步执行方案)
java·前端·spring boot·后端·spring