SpringBoot使用JdbcTemplate操作数据库

<?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>

  <groupId>com.dalaoyang</groupId>
  <artifactId>springboot_jdbc</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>springboot_jdbc</name>
  <description>springboot_jdbc</description>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>

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

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

  </dependencies>

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


</project>

##端口号
server.port=8888

##数据库配置
##数据库地址
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false
##数据库用户名
spring.datasource.username=root
##数据库密码
spring.datasource.password=123456
##数据库驱动
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

package com.dalaoyang.entity;


import org.springframework.jdbc.core.RowMapper;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * @author dalaoyang
 * @project springboot_learn
 * @package com.dalaoyang.entity
 * @email yangyang@dalaoyang.cn
 * @date 2018/7/25
 */
public class User implements RowMapper<User> {
  private int id;
  private String user_name;
  private String pass_word;

  public User(int id, String user_name, String pass_word) {
    this.id = id;
    this.user_name = user_name;
    this.pass_word = pass_word;
  }

  public User() {
  }

  public User(String user_name, String pass_word) {
    this.user_name = user_name;
    this.pass_word = pass_word;
  }

  public int getId() {
    return id;
  }

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

  public String getUser_name() {
    return user_name;
  }

  public void setUser_name(String user_name) {
    this.user_name = user_name;
  }

  public String getPass_word() {
    return pass_word;
  }

  public void setPass_word(String pass_word) {
    this.pass_word = pass_word;
  }

  @Override
  public User mapRow(ResultSet resultSet, int i) throws SQLException {
    User user = new User();
    user.setId(resultSet.getInt("id"));
    user.setUser_name(resultSet.getString("user_name"));
    user.setPass_word(resultSet.getString("pass_word"));
    return user;
  }
}

package com.dalaoyang.controller;

import com.dalaoyang.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @author dalaoyang
 * @project springboot_learn
 * @package com.dalaoyang.controller
 * @email yangyang@dalaoyang.cn
 * @date 2018/7/25
 */
@RestController
public class UserController {

  @Autowired
  private JdbcTemplate jdbcTemplate;

  //http://localhost:8888/createTable
  @GetMapping("createTable")
  public String createTable(){
    String sql = "CREATE TABLE `user` (\n" +
        " `id` int(11) NOT NULL AUTO_INCREMENT,\n" +
        " `user_name` varchar(255) DEFAULT NULL,\n" +
        " `pass_word` varchar(255) DEFAULT NULL,\n" +
        " PRIMARY KEY (`id`)\n" +
        ") ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;\n" +
        "\n";
    jdbcTemplate.execute(sql);
    return "创建User表成功";
  }

  //http://localhost:8888/saveUserSql
  @GetMapping("saveUserSql")
  public String saveUserSql(){
    String sql = "INSERT INTO USER (USER_NAME,PASS_WORD) VALUES ('dalaoyang','123')";
    int rows= jdbcTemplate.update(sql);
    return "执行成功，影响"+rows+"行";
  }

  //http://localhost:8888/saveUser?userName=lisi&passWord=111
  @GetMapping("saveUser")
  public String saveUser(String userName,String passWord){
    int rows= jdbcTemplate.update("INSERT INTO USER (USER_NAME,PASS_WORD) VALUES (?,?)",userName,passWord);
    return "执行成功，影响"+rows+"行";
  }

  //http://localhost:8888/updateUserPassword?id=1&passWord=111
  @GetMapping("updateUserPassword")
  public String updateUserPassword(int id,String passWord){
    int rows= jdbcTemplate.update("UPDATE USER SET PASS_WORD = ? WHERE ID = ?",passWord,id);
    return "执行成功，影响"+rows+"行";
  }

  //http://localhost:8888/deleteUserById?id=1
  @GetMapping("deleteUserById")
  public String deleteUserById(int id){
    int rows= jdbcTemplate.update("DELETE FROM USER WHERE ID = ?",id);
    return "执行成功，影响"+rows+"行";
  }


  //http://localhost:8888/batchSaveUserSql
  @GetMapping("batchSaveUserSql")
  public String batchSaveUserSql(){
    String sql =
        "INSERT INTO USER (USER_NAME,PASS_WORD) VALUES (?,?)" ;
    List<Object[]> paramList = new ArrayList<>();
    for (int i = 0; i < 10; i++) {
      String[] arr = new String[2];
      arr[0] = "zhangsan"+i;
      arr[1] = "password"+i;
      paramList.add(arr);
    }
    jdbcTemplate.batchUpdate(sql,paramList);
    return "执行成功";
  }

  //http://localhost:8888/getUserByUserName?userName=zhangsan0
  @GetMapping("getUserByUserName")
  public List getUserByUserName(String userName){
    String sql = "SELECT * FROM USER WHERE USER_NAME = ?";
    //写法很多种
    //下面列举两种写法，都可以实现
    //List<User> list= jdbcTemplate.query(sql,new Object[]{userName}, new BeanPropertyRowMapper(User.class));
    List<User> list= jdbcTemplate.query(sql,new User(),new Object[]{userName});
    return list;
  }

  //http://localhost:8888/getMapById?id=1
  @GetMapping("getMapById")
  public Map getMapById(Integer id){
    String sql = "SELECT * FROM USER WHERE ID = ?";
    Map map= jdbcTemplate.queryForMap(sql,id);
    return map;
  }

  //http://localhost:8888/getUserById?id=1
  @GetMapping("getUserById")
  public User getUserById(Integer id){
    String sql = "SELECT * FROM USER WHERE ID = ?";
    User user= jdbcTemplate.queryForObject(sql,new User(),new Object[]{id});
    return user;
  }

}