How to query the results in php

How to query results in php: 1. Obtain a row of elements in the result data set through the mysql_result() function; 2. Use the number as an attribute index to obtain the attribute value through the mysql_fetch_row() function; 3. Use mysql_fetch_array() The function directly obtains the attribute value; 4. Analyze the query results through the mysql_fetch_object() function.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

How does php analyze the query results?

Analysis of four query return results in PHP development, friends in need can refer to it.

1.

$connection=mysql_connect("localhost","root","password"); //连接并选择数据库服务器
mysql_select_db("test",$connection);
$query="insert into users(user_name)"; //在test数据库里插入一条数据
$query.="values('tuxiaohui')";
$result=mysql_query($query);
if(!$query)
echo "insert data failed!
";
else{
$query="select * from users"; //查询数据
$result=mysql_query($query,$connection);
for($rows_count=0;$rows_count<7;$rows_count++) //用mysql_result获得数据并输出，mysql_result() 返回 MySQL 结果集中一个单元的内容。
{
echo "用户ID：".mysql_result($result,$rows_count,"user_id")."
";
echo "用户名：".mysql_result($result,$rows_count,"user_name")."
";
}
}
?>

2.

$connection=mysql_connect("localhost","root","password"); //连接并选择数据库服务器
mysql_select_db("test",$connection);
$query="select * from users";
$result=mysql_query($query,$connection);
while($row=mysql_fetch_row($result))
{
echo "用户ID：".$row[0]."
";
echo "用户名：".$row[1]."
";
}
?>

3.

$connection=mysql_connect("localhost","root","password"); //连接并选择数据库服务器
mysql_select_db("test",$connection);
$query="select * from users";
$result=mysql_query($query,$connection);
while($row=mysql_fetch_array($result))
{
echo "用户ID：".$row[0]."
"; //也可以写做$row["user_id"]
echo "用户名：".$row[1]."
"; //也可以写做$row["user_name"]
}
?>

4.

$connection=mysql_connect("localhost","root","root"); //连接并选择数据库服务器
mysql_select_db("test",$connection);
$query="select * from users";
$result=mysql_query($query,$connection);
while($row=mysql_fetch_object($result))
{
echo "用户ID：".$row->user_id."
"; //通过对象运算符->获得改行数据在其属性上的值。
echo "用户名：".$row->user_name."
";
}
?>

5.Comprehensive comparison:

mysql_result(): The advantage is that it is easy to use; its disadvantage is that it has few functions. One call can only obtain one row of elements in the result data set, which is less efficient for larger databases;

mysql_fetch_row(): Advantages The execution efficiency is the highest among the four methods; the disadvantage is that only numbers can be used as attribute indexes to obtain attribute values, which is very easy to cause confusion when using them;

mysql_fetch_array(): The execution efficiency is equally high, same as mysql_fetch_row( ) is almost the same, and the attribute value can be obtained directly by using the attribute name, so it is most commonly used in practical applications;

mysql_fetch_object(): It adopts object-oriented thinking and is more advanced in design ideas. If you are used to it If you use object-oriented ideas to write programs, you will naturally choose it. Secondly, the advantage of this method is that the data results with a more responsible structure are logically clearer.

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