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[2008-05-28 20:53 UTC] morrisdavidd at gmail dot com
Description: ------------ The query is the exact same every time the statement is called. There are no parameters being bound. However, the function only returns true the first time the PDO->execute() is called. As per: http://us3.php.net/manual/en/pdostatement.execute.php "Return Values Returns TRUE on success or FALSE on failure." I've run a test where I had it sleep after the first $stmt->execute() long enough for me to change the value of the data being selected from the database (And I output the data being selected to make sure it was retrieved in its changed form the second time around). It still returned FALSE. However, the documentation for the function states: "Execute the prepared statement." ... "Returns TRUE on success or FALSE on failure." So, the function returns FALSE when it executed the prepared statement successfully. Reproduce code: --------------- Obviously You'll have to change the database name, user, pass, table... <?php $table = "SystemInformation"; $pdoDb = new PDO("mysql:host=localhost;dbname=eta_manybodystate", DB_USER, DB_PWD); $stmt = $pdoDb->prepare("SELECT * FROM `".$table."` LIMIT 1;"); $foo = $stmt->execute(); $stmt->closeCursor(); echo "foo: "; var_dump($foo); $bar = $stmt->execute(); $stmt->closeCursor(); echo "bar: "; var_dump($bar); $foo2 = $stmt->execute(); $stmt->closeCursor(); echo "foo2: "; var_dump($foo2); $bar2 = $stmt->execute(); $stmt->closeCursor(); echo "bar2: "; var_dump($bar2); ?> Expected result: ---------------- foo: bool(true) bar: bool(true) foo2: bool(true) bar2: bool(true) Actual result: -------------- foo: bool(true) bar: bool(false) foo2: bool(false) bar2: bool(false) PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Thu Nov 21 15:01:30 2024 UTC |
On the first look this seems to be a PDO not a PDO_MYSQL (or any other driver) bug. From pdo_stmt.c, static PHP_METHOD(PDOStatement, execute), around line 450: if (PDO_PLACEHOLDER_NONE == stmt->supports_placeholders) { /* handle the emulated parameter binding, * stmt->active_query_string holds the query with binds expanded and * quoted. */ ret = pdo_parse_params(stmt, stmt->query_string, stmt->query_stringlen, &stmt->active_query_string, &stmt->active_query_stringlen TSRMLS_CC); [...] } For some drivers, PDO assigns the return value of its pdo_parse_params() function to ret. And then the code flow continues and eventually the driver gets called to execute the statement (depending on the driver features): if (stmt->methods->executer(stmt TSRMLS_CC)) { if (stmt->active_query_string && stmt->active_query_string != stmt->query_string) { efree(stmt->active_query_string); } stmt->active_query_string = NULL; if (!stmt->executed) { /* this is the first execute */ if (stmt->dbh->alloc_own_columns && !stmt->columns) { /* for "big boy" drivers, we need to allocate memory to fetch * the results into, so lets do that now */ ret = pdo_stmt_describe_columns(stmt TSRMLS_CC); } stmt->executed = 1; } if (ret && !dispatch_param_event(stmt, PDO_PARAM_EVT_EXEC_POST TSRMLS_CC)) { RETURN_FALSE; } RETURN_BOOL(ret); } ret (returned ny pdo_parse_params()) will be overwritten only on the first execution. Upon subsequent executions the driver cannot set ret. You get a bool(false) because pdo_parse_params() has returned 0 (= success) and the return value of PDO_MYSQL has been ignored. Maybe it should read like this: if (ret = stmt->methods->executer(stmt TSRMLS_CC)) {