Druid簡(jiǎn)單實(shí)現(xiàn)數(shù)據(jù)庫的增刪改查方式

更新時(shí)間：2024年07月05日 09:13:06 作者：墨筆之風(fēng)

這篇文章主要介紹了Druid簡(jiǎn)單實(shí)現(xiàn)數(shù)據(jù)庫的增刪改查方式,具有很好的參考價(jià)值,希望對(duì)大家有所幫助,如有錯(cuò)誤或未考慮完全的地方,望不吝賜教

druid的使用步驟

1：導(dǎo)入相關(guān)的druid-jar包
2：定義配置文件
3：加載配置文件
4：獲取數(shù)據(jù)庫連接池對(duì)象
5：獲取鏈接

具體實(shí)現(xiàn)

相關(guān)包可以網(wǎng)上下載哦：：白/嫖/隊(duì)

將jar包放到lib文件下：點(diǎn)擊選擇 add as Library;

創(chuàng)建一個(gè)Java文件，獲取連接池與數(shù)據(jù)庫的隊(duì)?wèi)?yīng)匹配

注：特別注意導(dǎo)入文件地址的問題發(fā)生，大多報(bào)錯(cuò)都是地址不匹配

package DruidExample;
/*
 * 品牌
 * alt+鼠標(biāo)左鍵整列編輯
 * 鼠標(biāo)選中 ctrl+ r全選 直接替換全部
 *Alt + insert 生成構(gòu)造方法，和tostring方法
 * 在實(shí)體類型中，基本數(shù)據(jù)類型建議使用對(duì)應(yīng)包裝類型
 * */
public class Brand {
    //id 主鍵
    private int id;
    //品牌名稱
    private String brand_name;
    //企業(yè)名稱
    private String company_name;
    //排序字段
    private int ordered;
    //描述信息
    private String description;
    //狀態(tài)：0：禁用  1：?jiǎn)⒂?
    private int STATUS;

    public int getId() {
        return id;
    }

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

    public String getBrand_name() {
        return brand_name;
    }

    public void setBrand_name(String brand_name) {
        this.brand_name = brand_name;
    }

    public String getCompany_name() {
        return company_name;
    }

    public void setCompany_name(String company_name) {
        this.company_name = company_name;
    }

    public int getOrdered() {
        return ordered;
    }

    public void setOrdered(int ordered) {
        this.ordered = ordered;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public int getSTATUS() {
        return STATUS;
    }

    public void setSTATUS(int STATUS) {
        this.STATUS = STATUS;
    }

    @Override
    public String toString() {
        return "Brand{" +
                "id=" + id +
                ", brand_name='" + brand_name + '\'' +
                ", company_name='" + company_name + '\'' +
                ", ordered=" + ordered +
                ", description='" + description + '\'' +
                ", STATUS=" + STATUS +
                '}';
    }
}

將其中的文件進(jìn)行編輯更改：druid.properties

druid.properties 配置更改

url=jdbc:mysql://127.0.0.1:3307/mydb?rewriteBatchedStatements=true
username=root
password=root
driverClassName=com.mysql.cj.jdbc.Driver
initialSize=10
maxActive=20
maxWait=1000
filters=wall

修改里面的相關(guān)內(nèi)容與之匹配：

創(chuàng)建Java文件，生成構(gòu)造方法和toString方法；

package DruidExample;
/*
 * 品牌
 * alt+鼠標(biāo)左鍵整列編輯
 * 鼠標(biāo)選中 ctrl+ r全選 直接替換全部
 *Alt + insert 生成構(gòu)造方法，和tostring方法
 * 在實(shí)體類型中，基本數(shù)據(jù)類型建議使用對(duì)應(yīng)包裝類型
 * */
public class Brand {
    //id 主鍵
    private int id;
    //品牌名稱
    private String brand_name;
    //企業(yè)名稱
    private String company_name;
    //排序字段
    private int ordered;
    //描述信息
    private String description;
    //狀態(tài)：0：禁用  1：?jiǎn)⒂?
    private int STATUS;

    public int getId() {
        return id;
    }

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

    public String getBrand_name() {
        return brand_name;
    }

    public void setBrand_name(String brand_name) {
        this.brand_name = brand_name;
    }

    public String getCompany_name() {
        return company_name;
    }

    public void setCompany_name(String company_name) {
        this.company_name = company_name;
    }

    public int getOrdered() {
        return ordered;
    }

    public void setOrdered(int ordered) {
        this.ordered = ordered;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public int getSTATUS() {
        return STATUS;
    }

    public void setSTATUS(int STATUS) {
        this.STATUS = STATUS;
    }

    @Override
    public String toString() {
        return "Brand{" +
                "id=" + id +
                ", brand_name='" + brand_name + '\'' +
                ", company_name='" + company_name + '\'' +
                ", ordered=" + ordered +
                ", description='" + description + '\'' +
                ", STATUS=" + STATUS +
                '}';
    }
}





```java
package DruidExample;
import com.alibaba.druid.pool.DruidDataSourceFactory;
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;
/*
* 品牌數(shù)據(jù)的增刪改查功能
*1 獲取Connection 連接
*2 定義sql語句：select * from tb_brand; 變化項(xiàng)
*3 獲取PreparedStatement對(duì)象
*4 設(shè)置參數(shù)：不需要                      變化項(xiàng)
*5 執(zhí)行sql
*6 處理結(jié)果：list<Brand>                變化項(xiàng)
*7 釋放資源
* */
public class BrandTest {
**查詢所有相關(guān)信息**
    /*
    * 查詢所有功能的分析
    * 1.sql：select * from tb_brand;
    * 2.參數(shù)：不需要
    * 3.結(jié)果：List<Brand>
    * */
    @Test
    public  void  testSelectAll() throws Exception { //查詢語句
        //1 獲取連接的connection 對(duì)象
        // 加載配置文件
        Properties prop = new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        // 獲取連接池對(duì)象
        DataSource dataSource =  DruidDataSourceFactory.createDataSource(prop);
        //獲取數(shù)據(jù)庫鏈接 Connection
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        //2 定義sql語句
        String sql = "select * from tb_brand";
        //3 獲取pstmt 對(duì)象
        PreparedStatement pstmt = connection.prepareStatement(sql);
        //4 設(shè)置參數(shù)
        //5 執(zhí)行sql
        ResultSet rs = pstmt.executeQuery();
        //6 處理結(jié)果List<Brand>封裝Brand對(duì)象，裝載到List集合當(dāng)中去
        Brand brand = null;
        List<Brand> brands  = new ArrayList<>();
        while (rs.next()){
            //獲取數(shù)據(jù)
           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");
           //封裝Brand對(duì)象
            brand = new Brand();
            brand.setId(id);
            brand.setBrand_name(brandName);
            brand.setCompany_name(companyName);
            brand.setOrdered(ordered);
            brand.setDescription(description);
            brand.setSTATUS(status);
            //裝載集合
            brands.add(brand);
        }
        System.out.println(brands+"\n");//打印集合查看效果
    }
**向數(shù)據(jù)庫添加相關(guān)操作**
/*
* 添加
* 1 sql ：insert into tb_brand(brand_name,company_name,ordered,descript,status) value(?,?,?,?,?);
* 2 參數(shù)： 需要除iD之外的所有參數(shù)信息
* 3 結(jié)果 ：boolean
* */
    @Test
    public  void  testAdd() throws Exception { //添加不需要id 由數(shù)據(jù)庫主鍵自增自動(dòng)生成
        //接收頁面提交的參數(shù) (模擬)
        String brandName = "8848鈦晶手機(jī)";
        String companyName = "8848";
        int ordered = 1;
        String description = "成功人士的標(biāo)配";
        int STATUS = 1;
        //1 獲取連接的connection 對(duì)象
        // 加載配置文件
        Properties prop = new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        // 獲取連接池對(duì)象
        DataSource dataSource =  DruidDataSourceFactory.createDataSource(prop);
        //獲取數(shù)據(jù)庫鏈接 Connection
        Connection conn = dataSource.getConnection();
        System.out.println(conn);
        //2 定義sql語句
        String sql = "insert into tb_brand(brand_name,company_name,ordered,description,status) value(?,?,?,?,?);";
        //3 獲取pstmt 對(duì)象
        PreparedStatement pstmt = conn.prepareStatement(sql);
        //4 設(shè)置參數(shù)
        pstmt.setString(1,brandName);
        pstmt.setString(2,companyName);
        pstmt.setInt(3,ordered);
        pstmt.setString(4,description);
        pstmt.setInt(5,STATUS);
        //5 執(zhí)行sql
      int count =   pstmt.executeUpdate();//影響行數(shù)
        //6 處理結(jié)果
        System.out.println(count>0);//輸出結(jié)果是boolean類型的值
        //7 釋放資源
        pstmt.close();
        conn.close();
    }

**更新數(shù)據(jù)庫信息**
    /*
    * 修改功能的實(shí)現(xiàn) 通過id進(jìn)行修改
    * 1. sql ： update tb_brand
    *          set brand_naem = ?,
    *          company_name = ?,
    *          ordered = ?,
    *          descript = ?,
    *          STATUS = ?,
    *          where id = ?
    *2.參數(shù) ： 需要 ，需要用到所有的數(shù)據(jù)
    *3.結(jié)果 ：boolean類型
    * */
    @Test
    public  void  testUpdate() throws Exception { //添加不需要id 由數(shù)據(jù)庫主鍵自增自動(dòng)生成
        //接收頁面提交的參數(shù) (模擬)
        String brandName = "魅族經(jīng)典";
        String companyName = "flyme你手中的信仰";
        int ordered = 1000;
        String description = "這是一種奢華，也是一種擁有";
        int status = 1;
        int id = 4;
        //1 獲取連接的connection 對(duì)象
        // 加載配置文件
        Properties prop = new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        // 獲取連接池對(duì)象
        DataSource dataSource =  DruidDataSourceFactory.createDataSource(prop);
        //獲取數(shù)據(jù)庫鏈接 Connection
        Connection conn = dataSource.getConnection();
        System.out.println(conn);
        //2 定義sql語句
        String sql = "update tb_brand\n" +
                "        set  brand_name = ?,\n" +
                "         company_name  = ?,\n" +
                "         ordered       = ?,\n" +
                "         description   = ?,\n" +
                "          status       = ?\n"  +
                " where id = ?;";
        //3 獲取pstmt 對(duì)象
        PreparedStatement pstmt = conn.prepareStatement(sql);
        //4 設(shè)置參數(shù)
        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 執(zhí)行sql
        int count =   pstmt.executeUpdate();//影響行數(shù)
        //6 處理結(jié)果
        System.out.println(count>0);//輸出結(jié)果是boolean類型的值
        //7 釋放資源
        pstmt.close();
        conn.close();
    }
**刪除數(shù)據(jù)庫相關(guān)信息**
    /*
     * 刪除功能的實(shí)現(xiàn) 通過id進(jìn)行刪除
     * 1. sql ： delete from  tb_brand where id =4；
     *2.參數(shù) ： 需要 ，需要用到id參數(shù)
     *3.結(jié)果 ：boolean類型
     * */
    @Test
    public  void  testDeleteId() throws Exception { //添加不需要id 由數(shù)據(jù)庫主鍵自增自動(dòng)生成
        //接收頁面提交的參數(shù) (模擬)
        int id = 3;
        //1 獲取連接的connection 對(duì)象
        // 加載配置文件
        Properties prop = new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        // 獲取連接池對(duì)象
        DataSource dataSource =  DruidDataSourceFactory.createDataSource(prop);
        //獲取數(shù)據(jù)庫鏈接 Connection
        Connection conn = dataSource.getConnection();
        System.out.println(conn);
        //2 定義sql語句
        String sql = "delete from  tb_brand where id =?";
        //3 獲取pstmt 對(duì)象
        PreparedStatement pstmt = conn.prepareStatement(sql);
        //4 設(shè)置參數(shù)
        pstmt.setInt(1,id);
        //5 執(zhí)行sql
        int count =   pstmt.executeUpdate();//影響行數(shù)
        //6 處理結(jié)果
        System.out.println(count>0);//輸出結(jié)果是boolean類型的值
        //7 釋放資源
        pstmt.close();
        conn.close();
    }
}

用于測(cè)試的數(shù)據(jù)庫數(shù)據(jù)

use mydb;
CREATE table tb_brand(
	id int PRIMARY KEY auto_increment,
	brand_name VARCHAR(20),
	company_name VARCHAR(20),
	ordered int,
	description VARCHAR(100),
	STATUS int
);
--添加數(shù)據(jù)
insert into tb_brand(brand_name,company_name,ordered,description,status) 
VALUE('蘋果果','蘋果果技術(shù)有限公司',500,'吃個(gè)蘋果果解解渴',0),
('華為為','華為為技術(shù)有限公司',300,'華為為YYDS',1),
('小米米','小米米科技有限公司',200,'今天你發(fā)燒了嗎!',1);
select * from tb_brand; 
UPDATE tb_brand set ordered = 200 where id=3;