SpringBoot2+Druid+JdbcTemplate+MySql实现增删改查

1.配置pom.xml文件

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.czhappy.bootlearn</groupId>
    <artifactId>04-Spring-Boot-JdbcTemplate</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>04-Spring-Boot-JdbcTemplate</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- 数据库 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- JdbcTemplate -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!-- Druid Pool -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.16</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2.修改配置文件application.yml：

server:
  port: 8080
  servlet:
    context-path: /web

spring:
  datasource:
    druid:
      # 数据库访问配置, 使用druid数据源
      type: com.alibaba.druid.pool.DruidDataSource
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/springbootlearn?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=UTC
      username: root
      password: root
      # 连接池配置
      initial-size: 5
      min-idle: 5
      max-active: 20
      # 连接等待超时时间
      max-wait: 30000
      # 配置检测可以关闭的空闲连接间隔时间
      time-between-eviction-runs-millis: 60000
      # 配置连接在池中的最小生存时间
      min-evictable-idle-time-millis: 300000
      validation-query: select 'x'
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      # 打开PSCache，并且指定每个连接上PSCache的大小
      pool-prepared-statements: true
      max-open-prepared-statements: 20
      max-pool-prepared-statement-per-connection-size: 20
      # 配置监控统计拦截的filters, 去掉后监控界面sql无法统计, 'wall'用于防火墙
      filters: stat,wall
      # Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
      aop-patterns: com.springboot.servie.*

      # WebStatFilter配置
      web-stat-filter:
        enabled: true
        # 添加过滤规则
        url-pattern: /*
        # 忽略过滤的格式
        exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'

      # StatViewServlet配置
      stat-view-servlet:
        enabled: true
        # 访问路径为/druid时，跳转到StatViewServlet
        url-pattern: /druid/*
        # 是否能够重置数据
        reset-enable: false
        # 需要账号密码才能访问控制台
        login-username: druid
        login-password: druid123
        # IP白名单
        # allow: 127.0.0.1
        #　IP黑名单（共同存在时，deny优先于allow）
        # deny: 192.168.1.218

      # 配置StatFilter
      filter:
        stat:
          log-slow-sql: true

3.实现增删改查功能：

创建测试表tb_student，并插入几条测试数据

CREATE TABLE `tb_student` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `sno` varchar(10) DEFAULT NULL,
  `sname` varchar(100) DEFAULT NULL,
  `ssex` char(2) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

INSERT INTO `tb_student` VALUES ('', '', '张三', 'M');
INSERT INTO `tb_student` VALUES ('', '', '李四', 'M');
INSERT INTO `tb_student` VALUES ('', '', '王五', 'F');

创建对应实体：

package com.czhappy.bootlearn.SpringBootJdbcTemplate.entity;

import java.io.Serializable;

public class Student implements Serializable {
    private static final long serialVersionUID = -339516038496531943L;
    private Integer id;
    private String sno;
    private String name;
    private String sex;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public String getSno() {
        return sno;
    }

    public void setSno(String sno) {
        this.sno = sno;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

StudentDaoImp类代码

package com.czhappy.bootlearn.SpringBootJdbcTemplate.dao.impl;

import com.czhappy.bootlearn.SpringBootJdbcTemplate.dao.StudentDao;
import com.czhappy.bootlearn.SpringBootJdbcTemplate.entity.Student;
import com.czhappy.bootlearn.SpringBootJdbcTemplate.mapper.StudentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Repository;

import java.sql.Types;
import java.util.List;
import java.util.Map;

@Repository("studentDao")
public class StudentDaoImp implements StudentDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public int add(Student student) {
        // String sql = "insert into student(sno,sname,ssex) values(?,?,?)";
        // Object[] args = { student.getSno(), student.getName(), student.getSex() };
        // int[] argTypes = { Types.VARCHAR, Types.VARCHAR, Types.VARCHAR };
        // return this.jdbcTemplate.update(sql, args, argTypes);
        String sql = "insert into tb_student(sno,sname,ssex) values(:sno,:name,:sex)";
        NamedParameterJdbcTemplate npjt = new NamedParameterJdbcTemplate(this.jdbcTemplate.getDataSource());
        return npjt.update(sql, new BeanPropertySqlParameterSource(student));
    }

    @Override
    public int update(Student student) {
        String sql = "update tb_student set sname = ?,ssex = ? where sno = ?";
        Object[] args = { student.getName(), student.getSex(), student.getSno() };
        int[] argTypes = { Types.VARCHAR, Types.VARCHAR, Types.VARCHAR };
        return this.jdbcTemplate.update(sql, args, argTypes);
    }

    @Override
    public int deleteBysno(String sno) {
        String sql = "delete from tb_student where sno = ?";
        Object[] args = { sno };
        int[] argTypes = { Types.VARCHAR };
        return this.jdbcTemplate.update(sql, args, argTypes);
    }

    @Override
    public List<Map<String, Object>> queryStudentsListMap() {
        String sql = "select * from tb_student";
        return this.jdbcTemplate.queryForList(sql);
    }

    @Override
    public Student queryStudentBySno(String sno) {
        String sql = "select * from tb_student where sno = ?";
        Object[] args = { sno };
        int[] argTypes = { Types.VARCHAR };
        List<Student> studentList = this.jdbcTemplate.query(sql, args, argTypes, new StudentMapper());
        if (studentList != null && studentList.size() > 0) {
            return studentList.get(0);
        } else {
            return null;
        }
    }
}

可以直接使用List<Map<String, Object>>来接收；也可以使用库表对应的实体对象来接收，需要手动创建一个实现了org.springframework.jdbc.core.RowMapper的对象，用于将实体对象属性和库表字段一一对应：

package com.czhappy.bootlearn.SpringBootJdbcTemplate.mapper;

import com.czhappy.bootlearn.SpringBootJdbcTemplate.entity.Student;
import org.springframework.jdbc.core.RowMapper;

import java.sql.ResultSet;
import java.sql.SQLException;

public class StudentMapper implements RowMapper<Student> {
    @Override
    public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
        Student student = new Student();
        student.setId(rs.getInt("id"));
        student.setSno(rs.getString("sno"));
        student.setName(rs.getString("sname"));
        student.setSex(rs.getString("ssex"));
        return student;
    }
}

最终项目目录如下：

启动项目，测试查询接口：