mysql語句group用java代碼實現(xiàn)

首先你要在項目中加載對應(yīng)數(shù)據(jù)庫的驅(qū)動包，然后進行數(shù)據(jù)庫查詢，代碼待會給你。

成都創(chuàng)新互聯(lián)主營廣南網(wǎng)站建設(shè)的網(wǎng)絡(luò)公司,主營網(wǎng)站建設(shè)方案,成都APP應(yīng)用開發(fā),廣南h5微信小程序開發(fā)搭建,廣南網(wǎng)站營銷推廣歡迎廣南等地區(qū)企業(yè)咨詢

String sql="";

Class.forName("com.mysql.jdbc.Driver");

Connection con=DriverManager.getConnection("jdbc.mysql//localhost:3306/你的數(shù)據(jù)庫名","username","pwd");

PreparedStatement pstmt=con.prepareStatement(sql);

ResultSet rs=pstmt.executeQuery();

while(rs.next()){

System.out.println(rs.getInt(1)+" "+rs.getInt(2));

}

mysql數(shù)據(jù)庫怎樣用代碼編寫

HTML:

form action="insert.php" method="post"

Firstname: input type="text" name="firstname" /

Lastname: input type="text" name="lastname" /

Age: input type="text" name="age" /

input type="submit" /

/form

如何用PHP代碼實現(xiàn)MySQL數(shù)據(jù)庫的增刪改查

?php

$con = mysql_connect("localhost:3306","root","");

if (!$con) {

die('Could not connect: ' . mysql_error());

}

mysql_select_db("test", $con);

$result = mysql_query("SELECT * FROM user");

echo "table border='1'

tr

thUsername/th

thPassword/th

/tr";

while($row = mysql_fetch_array($result)) {

echo "tr";

echo "td" . $row['username'] . "/td";

echo "td" . $row['password'] . "/td";

echo "/tr";

}

echo "/table";

mysql_close($con);

?

從服務(wù)器中獲取用戶所有信息（SQL SELECT語句）并以表格形式出現(xiàn)

?php

$con = mysql_connect("localhost","root","");

if (!$con) {

die('Could not connect: ' . mysql_error());

}

mysql_select_db("test", $con);

mysql_query("DELETE FROM user WHERE username = '$_POST[username]'");

mysql_close($con);

?

刪除該用戶所有信息delete.php

?php

$con = mysql_connect("localhost:3306","root","");

if (!$con) {

die('Could not connect: ' . mysql_error());

}

mysql_select_db("test", $con);

$sql = "INSERT INTO user (username,password)

VALUES

('$_POST[username]','$_POST[password]')";

if (!mysql_query($sql,$con)) {

die('Error: ' . mysql_error());

}

echo "1 record added";

mysql_close($con);

?

注冊一個新用戶insert.php

?php

$con = mysql_connect("localhost","root","");

if (!$con) {

die('Could not connect: ' . mysql_error());

}

mysql_select_db("test", $con);

mysql_query("UPDATE user SET password = '$_POST[password]' WHERE username = '$_POST[username]'");

mysql_close($con);

?

修改一個用戶密碼update.php

html

head

titleFORM/title

/head

body

br /

h1Insert:/h1

form action="insert.php" method="post"

username:input type="name" name="username"/

br /

password:input type="password" name="password"/

input type="submit" value="submit"/

/form

br /hr /br /

h1Delete/h1

form action="delete.php" method="post"

username:input type="name" name="username" /

br /

Are you sure?input type="submit" value="sure" /

/form

br /hr /br /

h1Update/h1

form action="update.php" method="post"

username:input type="name" name="username"/

br /

You want to change your password into:input type="password" name="password"/

input type="submit" value="submit"/

/form

br /hr /br /

/body

/html

以上三個功能的提交源Operate.html

用mysql語句編寫代碼

這個是要有界面的，還要有類似C#，Java這種語言來寫邏輯講界面和數(shù)據(jù)庫結(jié)合起來，單sql是沒法實現(xiàn)這么復(fù)雜的邏輯的。

php調(diào)用mysql存儲過程，如何實現(xiàn)。 我的代碼如下：

mysql存儲過程返回2個資源，第一個是執(zhí)行信息，第二個是存儲過程返回結(jié)果。

mysql_*系列函數(shù)無法獲取超過1個資源，需使用mysqli或PDO代替。

PDO：

$stmt?=?$db-prepare("CALL?pro_rb_save(?,?,@return_msg);");??

$stmt-bindParam(1,?$a);

$stmt-bindParam(2,?$b);

$stmt-execute?();

$outputArray?=?$db-query("select?@return_msg")-fetch(PDO::FETCH_ASSOC);

var_export($return_msg);

java鏈接MYSQL數(shù)據(jù)庫并實現(xiàn)查找數(shù)據(jù)代碼如何寫？

首先創(chuàng)建一個連接工廠import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;public class ConnectionFactory {

private Connection conn=null;

private Statement stmt=null;

private ResultSet rs=null;

public ConnectionFactory() {

super();

// TODO Auto-generated constructor stub

} public void OpenConn() throws Exception{

try{

Class.forName("com.mysql.jdbc.Driver").newInstance();

String url="jdbc:mysql://127.0.0.1:3306/guestbook";

String user="root";

String password="root";

conn=DriverManager.getConnection(url,user,password);

}catch(Exception e){

System.out.println("創(chuàng)建鏈接拋出異常為："+e.getMessage());

}

} public ResultSet executeQuery(String sql) throws Exception{

try{

stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

rs=stmt.executeQuery(sql);

}catch(Exception e){

System.out.println("執(zhí)行查詢拋出的異常為:"+e.getMessage());

}

return rs;

} public void close() throws Exception{

try{

rs.close();

stmt.close();

conn.close();

}catch(Exception e){

System.out.println("關(guān)閉對象拋出的異常："+e.getMessage());

}

} }

測試類 import java.sql.ResultSet;public class TestJDBC {

public static void main(String[] args) {

ConnectionFactory c= new ConnectionFactory();

try {

c.OpenConn();

String sql="select * from tb_guestbook";

ResultSet rs=c.executeQuery(sql);

while(rs.next()){

System.out.println(rs.getString(2));

}

c.close();

System.out.println();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

當(dāng)前文章：mysql怎么實現(xiàn)代碼,mysql是怎么實現(xiàn)的
文章位置：http://aaarwkj.com/article36/hchgsg.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供網(wǎng)站內(nèi)鏈、、網(wǎng)站建設(shè)、電子商務(wù)、網(wǎng)頁設(shè)計公司、網(wǎng)站維護

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時需注明來源： 創(chuàng)新互聯(lián)