prepared-statement

问题 I'm having problem with GROUP BY. It returns the first entry it could find, but I would like it to return the last entry. Is that possible? Here is my query (prepared query): SELECT stamp_user, stamp_date, stamp_type FROM rws_stamps WHERE stamp_date >= ? GROUP BY stamp_user ORDER BY stamp_date DESC My table looks like this: What I want it to return is row 7 and 3, but i get 1 and 2. 回答1: Try: SELECT stamp_user, max(stamp_date), stamp_type FROM rws_stamps WHERE stamp_date >= ? GROUP BY stamp

问题 In most examples of SQL PHP prepared statements that I see, such as: $sql = 'INSERT INTO tasks(task_name, start_date, completed_date) VALUES(:task_name, :start_date, :completed_date)'; $stmt = $this->pdo->prepare($sql); $stmt->execute([ ':task_name' => $taskName, ':start_date' => $startDate, ':completed_date' => $completedDate, ]); the field names are nearly repeated ... 4 times! once after the INSERT INTO(...) : task_name (column name in SQL) once after the VALUES(...) : :task_name once in

问题 How to write prepared statements for SQLite in iPhone? Is it possible to do SQL Injection in iPhone apps that use sqlite db? 回答1: I would suggest that if you're starting to develop an iPhone app now you should probably use Core Data rather than coding directly to SQLite. Having said that, creating a prepared statement is simple and well documented: sqlite3_stmt* statement_handle; sqlite3_prepare_v2(db, "select a,b from Table where c = ?", -1, &statement_handle, NULL); And yes, it is possible

问题 How to write prepared statements for SQLite in iPhone? Is it possible to do SQL Injection in iPhone apps that use sqlite db? 回答1: I would suggest that if you're starting to develop an iPhone app now you should probably use Core Data rather than coding directly to SQLite. Having said that, creating a prepared statement is simple and well documented: sqlite3_stmt* statement_handle; sqlite3_prepare_v2(db, "select a,b from Table where c = ?", -1, &statement_handle, NULL); And yes, it is possible

问题 When running this query SELECT SYSDATE + INTERVAL '7' DAY FROM DUAL; in a prepareStatement like this PreparedStatement ps = connection.prepareStatement("select sysdate + interval ? day from dual" ); ps.setString(1, "7"); ps.executeQuery(); It will throw an exception, that the syntax is not good, it clearly is, cuz i'm able to run the same query in sql-developer. Is this a bug in PreparedStatement ? can i use prepared statements together with interval? 回答1: The entire expression INTERVAL '7'

问题 I have come across the following codes i feel it is doing the wrong thing: (Note that this is JDK 1.4.2, therefore the list is not typed) StringBuffer queryBuffer = new StringBuffer(); ArrayList temp = new ArrayList(); ... queryBuffer.append("and sb.POSTCODE = ? "); temp.add(postcode); ... conn = ConnectionManager.getConnection(); pstmt = conn.prepareStatement(queryBuffer.toString()); This is what i am concerned about: for(int i=0; i<temp.size(); i++) { log.debug("setString("+ (i+1) + "," +

问题 I have a stored procedure IsUserPresent like: DELIMITER $$ CREATE PROCEDURE IsUserPresent( in userid varchar (150), out isPresent bit ) BEGIN SET isPresent=0; SELECT COUNT(*) INTO isPresent FROM users_table WHERE users_table.userid=userid; END$$ and I want to call it from PHP using mysqli prepared statement. I am doing it following code snippet but it gives me warning. $connect=&ConnectDB(); $stmt=$connect->prepare("CALL IsUserPresent(?,?)"); $stmt->bind_param('si',$uid,$userCount); $stmt-

问题 This question already has answers here : How to get the insert ID in JDBC? (12 answers) Closed 3 years ago . This answer to this question done this way seems to be very difficult to find on the internet. Basically I am inserting values into a MySQL database using PreparedStatement. I use the PreparedStatement to escape the data to prevent SQL Injection attacks. The problem is, there is now way retreving those keys. String query="Insert INTO Table_A(name, age) (?, ?)"; //String query="Insert

问题 Here is my case: $sql = 'UPDATE user SET password = ? WHERE username = ? AND password = ?'; if($stmt->prepare($sql)) { $stmt->bind_param('sss', $newPass, $_SESSION['username'], $oldPass); $stmt->execute(); } Now, how can I see if the UPDATE query is successfully executed? And more precisely how can I see if the old password and username are correct so that I can store the new password? I've tried by doing this: $res = $stmt->execute(); echo 'Result: '.$res; But I always get: Result: 1 even if

问题 If I remember correctly, I think Jeff has mentioned in the Stack Overflow podcast a possible weakness in SQL prepared statements. I'm wondering what kind(s) of weakness(es) did he refer to? Was it possibly just about inappropriate usage thereof, or something more sinister? The podcast, to my remembering, didn't go deeper into the subject, it was just a pass-by-remark. 回答1: I think what he said was that, when you use Prepared Statements, SQL server could cache your query execution plan, so,