


Common code for Php connection and reading and writing mysql database, php writes mysql database
Since you have read this article now, it means that you must know what PHP and MySQL are, so I won’t go into details. But why are you continuing to read this article? Maybe you were used to copying and pasting some codes before, and didn’t really understand the meaning of the code; maybe you understood it before, but like me, you haven’t been in contact with it for a while and are rusty; or someone asked you something simple like this Question, but you didn’t bother to answer it, just searched online, and happened to find this article, so I recommended it to so and so...
Anyway, here I summarize the commonly used methods of connecting PHP to MySQL database and reading and writing to the database. I hope it can help you, and of course it is also used as a review summary for myself.
1. In order to better set up the data connection, the values involved in the data connection are generally defined as variables.
$mysql_server_name='localhost'; //改成自己的mysql数据库服务器 $mysql_username='root'; //改成自己的mysql数据库用户名 $mysql_password='123456'; //改成自己的mysql数据库密码 $mysql_database='Mydb'; //改成自己的mysql数据库名
You can also put the above variables in a file, which can be called by other files at any time.
For example: put the above content in: db_config.php and call it directly on other pages that need to use the database.
Calling code: require("db_config.php");
2. Connect to the database
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password) or die("error connecting") ; //连接数据库 mysql_query("set names 'utf8'"); //数据库输出编码 应该与你的数据库编码保持一致.南昌网站建设公司百恒网络PHP工程师建议用UTF-8 国际标准编码. mysql_select_db($mysql_database); //打开数据库 $sql ="select * from news "; //SQL语句 $result = mysql_query($sql,$conn); //查询
3. Read the contents of the table. Here we use while, but you can use for or others according to the specific situation.
while($row = mysql_fetch_array($result)) { echo "<div style=\"height:24px; line-height:24px; font-weight:bold;\">"; //排版代码 echo $row['Topic'] . "<br/>"; echo "</div>"; //排版代码 }
4.php writes to database, Mysql data writing
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password); //连接数据库 mysql_query("set names 'utf8'"); //数据库输出编码 mysql_select_db($mysql_database); //打开数据库 $sql = "insert into messageboard (Topic,Content,Enabled,Date) values ('$Topic','$Content','1','2011-01-12')"; mysql_query($sql); mysql_close(); //关闭MySQL连接
Connection: mysql_connect("Host","User","Password");
mysql_select_db("Database name");
Write data: mysql_query("insert into table name(field 1, field 2) values ("data 1", "data 2")");
Your question is too vague, so I can only give you this answer. If you don't understand, ask further.
/*
Take data.txt as an example
When data is stored in a text document
fputs("data.txt","$str1\t $str2\r\n");
In this form!
*/
$str = file_get_contents("data.txt") or die("File opening failed");
$ r = explode("\r\n",$str);
/*
....Connect to the database
*/
$sql = "insert into `table`('id' ,'num') values ('".$r[0]."','".$r[1]."')";
mysql_query($sql);
// The above code has not been tested. If you have any questions, please ask me
?>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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