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

1、jdbc.properties

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

2、beans.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"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

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

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 {@Autowiredprivate DataSource dataSource;@Autowiredprivate JdbcTemplate jdbcTemplate;//测试连接数据库@Testpublic 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@Testpublic 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@Testpublic void DeleteTest() {String sql = "delete from students where id=?";jdbcTemplate.update(sql, 0);}//演示查询单个字段值@Testpublic 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@Testpublic void QueryObjectTest() {String sql = "select * from students where id=?";Student s = jdbcTemplate.queryForObject(sql, new RowMapper<Student>() {@Overridepublic 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@Testpublic 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@Testpublic 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

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

    <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

    <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：

添加spring-jdbc依赖

首先需要在Maven或Gradle项目中添加spring-jdbc依赖。
<dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.3.6</version>
</dependency>
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。
<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>
配置JdbcTemplate

配置JdbcTemplate，配置JdbcTemplate时需要注入数据源。
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"/>
</bean>
使用JdbcTemplate

最后，你可以在Java代码中使用JdbcTemplate。
@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。