This article describes how to use mysql_fetch_array () to obtain the data of the current row. For more information, see mysql_fetch_row () it also gets the data of the current row in the result set and automatically slides down a row after the call. It is defined as follows.
The code is as follows:
Array mysql_fetch_array (int result, int [result_type])
The parameters are described as follows.
(1) result: the result ID returned by mysql_query () or mysql_db_query () is used to specify the SQL statement type of the data to be obtained.
(2) result_type: it is used to specify the result set type. optional. the value range is the PHP constant set {MYSQL_ASSOC, MYSQL_NUM, MYSQL_BOTH }.
The function return value is as follows.
Successful:An array that contains the data of the current row in the query result set. the subscript range of the array is 0 ~ The number of record attributes − 1. the value of the I-th element in the array is the value of the I-th attribute of the record. You can also use the attribute name to obtain the value of this attribute.
Failed: false.
The following example uses mysql_fetch_array () to obtain the books whose price is not less than 20 in the Computers data table.
The code is as follows:
1
2 3 // Connect and select database server
4 $ connection = mysql_connect ("localhost", "root", "password ");
5 mysql_select_db ("Books", $ connection );
6 // query data
7 $ query = "SELECT * FROM Computers ";
8 $ query. = "WHERE price> = 20 ";
9 // echo $ query ."
";
10 $ result = mysql_query ($ query, $ connection );
11 // mysql_fetch_array () obtain the data and output
12 while ($ row = mysql_fetch_array ($ result ))
13 {
14 echo "title:". $ row [1]."
";
15 echo "price:". $ row ["price"]."
";
16 echo "publication date:". $ row ["publish_date"]."
";
17 echo"
";
18}
19?>
In the example, use mysql_fetch_array () in row 12th to obtain the data of the current row ~ In the cycle of the 18 rows, the attribute index and attribute name are used to obtain the values of a certain attribute in this row. It is not hard to see that the difference between mysql_fetch_array () and mysql_fetch_row () is that the former returns two copies of the result set in the array, and the other one can be accessed through the attribute index, the other one can be accessed through the attribute name.
Note:
When you access the value of a property by using the property name, if the names of several attributes are the same, the attribute after the index overwrites the previous attribute value. Therefore, when using attribute names to obtain data, avoid duplicate attributes in the query result set.
The running result of the example is as follows.
The code is as follows:
Title: Data structure
Price: 20
Published on: 2001-001
Title: C language
Price: 23
Published on:
Title: PHP entry-level technology
Price: 22
Published on:
