prepared-statement

来源： https://stackoverflow.com/questions/20176878/php-fetching-prepared-stmt-into-class-fatal-error-class-not-found

来源： https://stackoverflow.com/questions/20176878/php-fetching-prepared-stmt-into-class-fatal-error-class-not-found

来源： https://stackoverflow.com/questions/40123417/select-querys-order-not-working-in-prepared-statement

来源： https://stackoverflow.com/questions/40123417/select-querys-order-not-working-in-prepared-statement

问题 I've followed this MySQL Manual to the letter, and changed it slightly to try and make a program that inserts 4 values into table. The structure of the table is: MariaDB [(none)]> desc analytics.live; +--------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------+-------------+------+-----+---------+-------+ | dat_sent | int(11) | NO | | NULL | | | machine_id | varchar(33) | YES | | NULL | | | foreign_addr | varchar(50) | YES | |

问题 I just upgraded mysql jdbc connection JAR (from mysql-connector-java-5.0.5.jar to mysql-connector-java-8.0.19.jar) and the project started showing error for import statements: import com.mysql.jdbc.PreparedStatement; java: cannot find symbol symbol: class PreparedStatement location: class package.ClassName Where to find the location or package for PreparedStatement in new jar file or is it replaced with any other class in new JAR? 回答1: Try to replace it with: import java.sql.PreparedStatement

问题 I'm trying to add data to a database using SQLite3 in PHP. I got it working without prepared statements but now I'm trying to make it safer. I'm not using PDO. So far the following code doesn't work. It just inserts the words ":name" and ":email" into the database, instead of what their bound values should be: $smt = $db->prepare("insert into names (name, email) values (':name', ':email')"); $smt->bindValue(':name', $var_name); $smt->bindValue(':email', $var_email); $var_name = ($_POST[post

问题 I'm trying to add data to a database using SQLite3 in PHP. I got it working without prepared statements but now I'm trying to make it safer. I'm not using PDO. So far the following code doesn't work. It just inserts the words ":name" and ":email" into the database, instead of what their bound values should be: $smt = $db->prepare("insert into names (name, email) values (':name', ':email')"); $smt->bindValue(':name', $var_name); $smt->bindValue(':email', $var_email); $var_name = ($_POST[post

问题 Unfortunatelly, the documentation completely lacks examples (what is really strange), as if it assumes all its readers to be good programmers. Whereas, I'm quite new to C++ and can not really figure out from the documentation how to really prepare and execute statements. I love the way how it is implemented in PDO for PHP . Normally, I just do it like this: $s = $db->prepare("SELECT id FROM mytable WHERE id = :id"); $s->bindParam(':id', $id); $s->execute(); or do it using ? tokens: $data =

问题 I know that closing prepared statements is a suggested thing to do. But I have a PHP script like this: $sql = "SELECT * FROM `mytable` WHERE ..."; $stmt = $dbh->stmt_init(); if($stmt->prepare($sql)) { $stmt->bind_param("s", $user); if($stmt->execute()) { $result = $stmt->get_result(); $stmt->close(); } else header("Location: .?error=unknown"); } else header("Location: .?error=conn"); The statement gets closed if everything is ok, but when something fails during the execution it doesn't get