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(PHP 4 >= 4.3.0, PHP 5, PECL mysql:1.0)
Example 1446. Relevant MySQL StatementsStatements that return string values. The numbers are only for illustrating purpose; their values will correspond to the query. INSERT INTO ... SELECT ...Code Examples / Notes » mysql_infocarl
This function can be used as a workaround for a misfeature of MySQL: on an UPDATE, rows that aren't updated _solely because they looked the same before_ will not be seen in mysql_affected_rows(). This causes problems when you want to use the result of the update to determine if there's need to do an INSERT. With MySQL you can do an INSERT IGNORE if there's no risk of if failing because of a duplicate key other than the one used in the UPDATE. However, if this isn't the case or you want a bit of RDBMS independence, there's no easy/pretty workaround. I think I'll resort to doing a SELECT to determine the primary key before doing the update/insert, as using the CVS version of PHP isn't an option for me.
info
Imade a quick conversion of eric's function just to count matched or affected rows from a query. /**GD gdf_db_count_query_v1: returns the amount of rows matched or affected by the last query. Must be used immediately after the concerned query. */ function gdf_db_count_query($link = 'dbh') { $info_str = mysql_info($$link); if (ereg("Records: ([0-9]*)", $info_str, $count) == false) { ereg("Rows matched: ([0-9]*)", $info_str, $count); } return $count; } eric
I agree that this is a useful function to use when trying to check on whether an update query matched a particular row. I created a simple function that returns an associative array with the values delineated in the returned string. function get_mysql_info($linkid = null){ $linkid? $strInfo = mysql_info($linkid) : $strInfo = mysql_info(); $return = array(); ereg("Records: ([0-9]*)", $strInfo, $records); ereg("Duplicates: ([0-9]*)", $strInfo, $dupes); ereg("Warnings: ([0-9]*)", $strInfo, $warnings); ereg("Deleted: ([0-9]*)", $strInfo, $deleted); ereg("Skipped: ([0-9]*)", $strInfo, $skipped); ereg("Rows matched: ([0-9]*)", $strInfo, $rows_matched); ereg("Changed: ([0-9]*)", $strInfo, $changed); $return['records'] = $records[1]; $return['duplicates'] = $dupes[1]; $return['warnings'] = $warnings[1]; $return['deleted'] = $deleted[1]; $return['skipped'] = $skipped[1]; $return['rows_matched'] = $rows_matched[1]; $return['changed'] = $changed[1]; return $return; } After trying to update a row that may or may not exist, you can use the above function like so: $vals = get_mysql_info($linkid); if($vals['rows_matched'] == 0){ mysql_query("INSERT INTO table values('val1','val2', 'valetc')", $linkid); } bdobrica
As a solution to the problem pointed in the post reffering to mysql_affected_rows() returning 0 when you are making an update query and the fields are not modified although the query is valid, i'm posting the following function. It is very simple and based on a previous post. function mysql_modified_rows () { $info_str = mysql_info(); $a_rows = mysql_affected_rows(); ereg("Rows matched: ([0-9]*)", $info_str, $r_matched); return ($a_rows < 1)?($r_matched[1]?$r_matched[1]:0):$a_rows; } Hope you'll find it usefull. |
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