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                                  mysql_query

   (PHP 3, PHP 4 )
   mysql_query -- Send a MySQL query

Description

   resource mysql_query ( string query [, resource link_identifier])

   mysql_query() sends a query to the currently active database on the
   server that's associated with the specified link identifier. If
   link_identifier isn't specified, the last opened link is assumed. If
   no link is open, the function tries to establish a link as if
   mysql_connect() was called with no arguments, and use it. The result
   of the query is buffered.

     Note: The query string should not end with a semicolon.

   Only for SELECT,SHOW,EXPLAIN or DESCRIBE statements mysql_query()
   returns a resource identifier or FALSE if the query was not executed
   correctly. For other type of SQL statements, mysql_query() returns
   TRUE on success and FALSE on error. A non-FALSE return value means
   that the query was legal and could be executed by the server. It does
   not indicate anything about the number of rows affected or returned.
   It is perfectly possible for a query to succeed but affect no rows or
   return no rows.

   The following query is syntactically invalid, so mysql_query() fails
   and returns FALSE:

   Example 1. mysql_query() example
   <php
   $result = mysql_query("SELECT * WHERE 1=1")
       or die("Invalid query: " . mysql_error());
   ?>

   The following query is semantically invalid if my_col is not a column
   in the table my_tbl, so mysql_query() fails and returns FALSE:

   Example 2. mysql_query()
   <?php
   $result = mysql_query("SELECT my_col FROM my_tbl")
       or die("Invalid query: " . mysql_error());
   ?>

   mysql_query() will also fail and return FALSE if you don't have
   permission to access the table(s) referenced by the query.

   Assuming the query succeeds, you can call mysql_num_rows() to find out
   how many rows were returned for a SELECT statement or
   mysql_affected_rows() to find out how many rows were affected by a
   DELETE, INSERT, REPLACE, or UPDATE statement.

   Only for SELECT,SHOW,DESCRIBE or EXPLAIN statements, mysql_query()
   returns a new result identifier that you can pass to
   mysql_fetch_array() and other functions dealing with result tables.
   When you are done with the result set, you can free the resources
   associated with it by calling mysql_free_result(). Although, the
   memory will automatically be freed at the end of the script's
   execution.

   See also mysql_num_rows(), mysql_affected_rows(),
   mysql_unbuffered_query(), mysql_free_result(), mysql_fetch_array(),
   mysql_fetch_row(), mysql_fetch_assoc(), mysql_result(),
   mysql_select_db() and mysql_connect().
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