Home Backend Development PHP Tutorial 感觉是正确的语句不知那里出了有关问题,得不到结果。

感觉是正确的语句不知那里出了有关问题,得不到结果。

Jun 13, 2016 pm 01:39 PM
content echo mysql quot

感觉是正确的语句不知那里出了问题,得不到结果。。。求助

PHP code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

-->$flag=mysql_query("insert into tb_leaveword(userid,createtime,title,content) values('$userid','$createtime','$title','$content')",$conn);
echo "$flag";
Copy after login

调试过程中,不知道为什么,echo打不出来返回值。mysql数据库连接是正常的,后面每个变量也都可以用echo打出来。数据也没写到数据库里面,到底出了什么问题呢?


------解决方案--------------------
PHP code

$sql="insert into tb_leaveword(userid,createtime,title,content) values('$userid','$createtime','$title','$content')";
echo "sql-->>$sql<br>";
$flag=mysql_query($sql,$conn);
$num = mysql_affected_rows();  //执行sql所影响的行数
echo "num-->>$num<br>";
if($num > 0){
  echo "执行成功";
  while($rows = mysql_fetch_array($flag)){……}
}else{
  echo "执行失败";
}
<br><font color="#e78608">------解决方案--------------------</font><br>
mysql_query("insert into tb_leaveword(userid,createtime,title,content) values('$userid','$createtime','$title','$content')",$conn) or die(mysql_error());<br><br>echo "$flag"; 没有东西就表示你的 SQL 语句有问题了<br><br>mysql_query 在执行非 select 指令时,只返回逻辑值。false 用 echo 只能是没有内容<br>要 var_dump($flag); 才行
<br><font color="#e78608">------解决方案--------------------</font><br>语法问题排除,但其它原因就没法给你排除,你需要贴出mysql_error()才能知道 <div class="clear">
                 
              
              
        
            </div>
Copy after login
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

The relationship between mysql user and database The relationship between mysql user and database Apr 08, 2025 pm 07:15 PM

In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

MySQL: The Ease of Data Management for Beginners MySQL: The Ease of Data Management for Beginners Apr 09, 2025 am 12:07 AM

MySQL is suitable for beginners because it is simple to install, powerful and easy to manage data. 1. Simple installation and configuration, suitable for a variety of operating systems. 2. Support basic operations such as creating databases and tables, inserting, querying, updating and deleting data. 3. Provide advanced functions such as JOIN operations and subqueries. 4. Performance can be improved through indexing, query optimization and table partitioning. 5. Support backup, recovery and security measures to ensure data security and consistency.

How to fill in mysql username and password How to fill in mysql username and password Apr 08, 2025 pm 07:09 PM

To fill in the MySQL username and password: 1. Determine the username and password; 2. Connect to the database; 3. Use the username and password to execute queries and commands.

Query optimization in MySQL is essential for improving database performance, especially when dealing with large data sets Query optimization in MySQL is essential for improving database performance, especially when dealing with large data sets Apr 08, 2025 pm 07:12 PM

1. Use the correct index to speed up data retrieval by reducing the amount of data scanned select*frommployeeswherelast_name='smith'; if you look up a column of a table multiple times, create an index for that column. If you or your app needs data from multiple columns according to the criteria, create a composite index 2. Avoid select * only those required columns, if you select all unwanted columns, this will only consume more server memory and cause the server to slow down at high load or frequency times For example, your table contains columns such as created_at and updated_at and timestamps, and then avoid selecting * because they do not require inefficient query se

Can I retrieve the database password in Navicat? Can I retrieve the database password in Navicat? Apr 08, 2025 pm 09:51 PM

Navicat itself does not store the database password, and can only retrieve the encrypted password. Solution: 1. Check the password manager; 2. Check Navicat's "Remember Password" function; 3. Reset the database password; 4. Contact the database administrator.

How to create navicat premium How to create navicat premium Apr 09, 2025 am 07:09 AM

Create a database using Navicat Premium: Connect to the database server and enter the connection parameters. Right-click on the server and select Create Database. Enter the name of the new database and the specified character set and collation. Connect to the new database and create the table in the Object Browser. Right-click on the table and select Insert Data to insert the data.

How to view mysql How to view mysql Apr 08, 2025 pm 07:21 PM

View the MySQL database with the following command: Connect to the server: mysql -u Username -p Password Run SHOW DATABASES; Command to get all existing databases Select database: USE database name; View table: SHOW TABLES; View table structure: DESCRIBE table name; View data: SELECT * FROM table name;

How to copy tables in mysql How to copy tables in mysql Apr 08, 2025 pm 07:24 PM

Copying a table in MySQL requires creating new tables, inserting data, setting foreign keys, copying indexes, triggers, stored procedures, and functions. The specific steps include: creating a new table with the same structure. Insert data from the original table into a new table. Set the same foreign key constraint (if the original table has one). Create the same index. Create the same trigger (if the original table has one). Create the same stored procedure or function (if the original table is used).

See all articles