(PHP 4 >= 4.3.0, PHP 5)
mysql_info — 获取最近查询的有关信息
本扩展自 PHP 5.5.0 起已废弃，并在自 PHP 7.0.0 开始被移除。应使用 MySQLi 或 PDO_MySQL 扩展来替换之。参见 MySQL：选择 API 指南来获取更多信息。用以替代本函数的有：
link_identifierMySQL
连接。如不指定连接标识，则使用由 mysql_connect()
最近打开的连接。如果没有找到该连接，会尝试不带参数调用
mysql_connect()
来创建。如没有找到连接或无法建立连接，则会生成
E_WARNING 级别的错误。
示例 #1 相关的 MySQL 语句
返回字符串值的语句。这些数字仅用于说明目的；它们的值将与查询相对应。
INSERT INTO ... SELECT ... String format: Records: 23 Duplicates: 0 Warnings: 0 INSERT INTO ... VALUES (...),(...),(...)... String format: Records: 37 Duplicates: 0 Warnings: 0 LOAD DATA INFILE ... String format: Records: 42 Deleted: 0 Skipped: 0 Warnings: 0 ALTER TABLE String format: Records: 60 Duplicates: 0 Warnings: 0 UPDATE String format: Rows matched: 65 Changed: 65 Warnings: 0
注意:
mysql_info() 对于 INSERT ... VALUES 语句仅在该语句中列出了多个值的情况下返回非
false的值。
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 $count;
}I agree that this is a useful function to use when trying to check on whether an update query matched a particular row. I created a simple function that returns an associative array with the values delineated in the returned string.
function get_mysql_info($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);
}Please note that the information on warning count cannot be taken from the mysql_info() due to mysql bugs #41283 and #41285:
http://bugs.mysql.com/?id=41283
http://bugs.mysql.com/?id=41285As 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.