5.22总结-526互联

package com.mf.jdbc.exmaple;

import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.mf.jdbc.Brand;
import org.junit.Test;

import javax.sql.DataSource;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

/**

品牌数据的增删改查操作
*/
public class BrandTest {

/**

查询所有
1. SQL：select * from tb_brand;
1. 参数：不需要
1. 结果：List
  */

@Test
public void testSelectAll() throws Exception {
//1. 获取Connection
//3. 加载配置文件
Properties prop = new Properties();
prop.load(new FileInputStream("./src/druid.properties"));
//4. 获取连接池对象
DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

 //5. 获取数据库连接 Connection
 Connection conn = dataSource.getConnection();

 //2. 定义SQL
 String sql = "select * from tb_brand;";

 //3. 获取pstmt对象
 PreparedStatement pstmt = conn.prepareStatement(sql);

 //4. 设置参数

 //5. 执行SQL
 ResultSet rs = pstmt.executeQuery();

 //6. 处理结果 List<Brand> 封装Brand对象，装载List集合
 Brand brand = null;
 List<Brand> brands = new ArrayList<>();
 while (rs.next()){
     //获取数据
     int id = rs.getInt("id");
     String brandName = rs.getString("brand_name");
     String companyName = rs.getString("company_name");
     int ordered = rs.getInt("ordered");
     String description = rs.getString("description");
     int status = rs.getInt("status");
     //封装Brand对象
     brand = new Brand();
     brand.setId(id);
     brand.setBrandName(brandName);
     brand.setCompanyName(companyName);
     brand.setOrdered(ordered);
     brand.setDescription(description);
     brand.setStatus(status);

     //装载集合
     brands.add(brand);

 }
 System.out.println(brands);
 //7. 释放资源
 rs.close();
 pstmt.close();
 conn.close();

}

/**

添加
1. SQL：insert into tb_brand(brand_name, company_name, ordered, description, status) values(?,?,?,?,?);
1. 参数：需要，除了id之外的所有参数信息
1. 结果：boolean
  */

@Test
public void testAdd() throws Exception {
// 接收页面提交的参数
String brandName = "香飘飘";
String companyName = "香飘飘";
int ordered = 1;
String description = "绕地球一圈";
int status = 1;

 //1. 获取Connection
 //3. 加载配置文件
 Properties prop = new Properties();
 prop.load(new FileInputStream("./src/druid.properties"));
 //4. 获取连接池对象
 DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

 //5. 获取数据库连接 Connection
 Connection conn = dataSource.getConnection();

 //2. 定义SQL
 String sql = "insert into tb_brand(brand_name, company_name, ordered, description, status) values(?,?,?,?,?);";

 //3. 获取pstmt对象
 PreparedStatement pstmt = conn.prepareStatement(sql);

 //4. 设置参数
 pstmt.setString(1,brandName);
 pstmt.setString(2,companyName);
 pstmt.setInt(3,ordered);
 pstmt.setString(4,description);
 pstmt.setInt(5,status);

 //5. 执行SQL
 int count = pstmt.executeUpdate(); // 影响的行数
 //6. 处理结果
 System.out.println(count > 0);


 //7. 释放资源
 pstmt.close();
 conn.close();

}

/**

修改
1. SQL：

update tb_brand
set brand_name = ?,
company_name= ?,
ordered = ?,
description = ?,
status = ?
where id = ?

1. 参数：需要，所有数据
1. 结果：boolean
  */

@Test
public void testUpdate() throws Exception {
// 接收页面提交的参数
String brandName = "香飘飘";
String companyName = "香飘飘";
int ordered = 1000;
String description = "绕地球三圈";
int status = 1;
int id = 4;

 //1. 获取Connection
 //3. 加载配置文件
 Properties prop = new Properties();
 prop.load(new FileInputStream("jdbc-demo/src/druid.properties"));
 //4. 获取连接池对象
 DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

 //5. 获取数据库连接 Connection
 Connection conn = dataSource.getConnection();

 //2. 定义SQL
 String sql = " update tb_brand\n" +
         "         set brand_name  = ?,\n" +
         "         company_name= ?,\n" +
         "         ordered     = ?,\n" +
         "         description = ?,\n" +
         "         status      = ?\n" +
         "     where id = ?";

 //3. 获取pstmt对象
 PreparedStatement pstmt = conn.prepareStatement(sql);

 //4. 设置参数
 pstmt.setString(1,brandName);
 pstmt.setString(2,companyName);
 pstmt.setInt(3,ordered);
 pstmt.setString(4,description);
 pstmt.setInt(5,status);
 pstmt.setInt(6,id);

 //5. 执行SQL
 int count = pstmt.executeUpdate(); // 影响的行数
 //6. 处理结果
 System.out.println(count > 0);


 //7. 释放资源
 pstmt.close();
 conn.close();

}

/**

删除
1. SQL：

delete from tb_brand where id = ?

1. 参数：需要，id
1. 结果：boolean
  */

@Test
public void testDeleteById() throws Exception {
// 接收页面提交的参数

 int id = 4;


 //1. 获取Connection
 //3. 加载配置文件
 Properties prop = new Properties();
 prop.load(new FileInputStream("jdbc-demo/src/druid.properties"));
 //4. 获取连接池对象
 DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

 //5. 获取数据库连接 Connection
 Connection conn = dataSource.getConnection();

 //2. 定义SQL
 String sql = " delete from tb_brand where id = ?";

 //3. 获取pstmt对象
 PreparedStatement pstmt = conn.prepareStatement(sql);

 //4. 设置参数

 pstmt.setInt(1,id);

 //5. 执行SQL
 int count = pstmt.executeUpdate(); // 影响的行数
 //6. 处理结果
 System.out.println(count > 0);


 //7. 释放资源
 pstmt.close();
 conn.close();

}
}