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Customer Podcast - City of St. Cloud
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MYSQLI_PREPARE(3) 1 MYSQLI_PREPARE(3) mysqli::prepare - Prepare an SQL statement for execution Object oriented style SYNOPSIS
mysqli_stmt mysqli::prepare (string $query) DESCRIPTION
Procedural style mysqli_stmt mysqli_prepare (mysqli $link, string $query) Prepares the SQL query, and returns a statement handle to be used for further operations on the statement. The query must consist of a single SQL statement. The parameter markers must be bound to application variables using mysqli_stmt_bind_param(3) and/or mysqli_stmt_bind_result(3) before exe- cuting the statement or fetching rows. PARAMETERS
o $ link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3) o $query - The query, as a string. Note You should not add a terminating semicolon or g to the statement. This parameter can include one or more parameter markers in the SQL statement by embedding question mark ( ?) characters at the appropriate positions. Note The markers are legal only in certain places in SQL statements. For example, they are allowed in the VALUES() list of an INSERT statement (to specify column values for a row), or in a comparison with a column in a WHERE clause to specify a com- parison value. However, they are not allowed for identifiers (such as table or column names), in the select list that names the columns to be returned by a SELECT statement, or to specify both operands of a binary operator such as the = equal sign. The latter restriction is necessary because it would be impossible to determine the parameter type. It's not allowed to compare marker with NULL by ? IS NULL too. In general, parameters are legal only in Data Manipulation Language (DML) statements, and not in Data Definition Language (DDL) statements. RETURN VALUES
mysqli_prepare(3) returns a statement object or FALSE if an error occurred. EXAMPLES
Example #1 mysqli::prepare example Object oriented style <?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s ", mysqli_connect_error()); exit(); } $city = "Amersfoort"; /* create a prepared statement */ if ($stmt = $mysqli->prepare("SELECT District FROM City WHERE Name=?")) { /* bind parameters for markers */ $stmt->bind_param("s", $city); /* execute query */ $stmt->execute(); /* bind result variables */ $stmt->bind_result($district); /* fetch value */ $stmt->fetch(); printf("%s is in district %s ", $city, $district); /* close statement */ $stmt->close(); } /* close connection */ $mysqli->close(); ?> Procedural style <?php $link = mysqli_connect("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s ", mysqli_connect_error()); exit(); } $city = "Amersfoort"; /* create a prepared statement */ if ($stmt = mysqli_prepare($link, "SELECT District FROM City WHERE Name=?")) { /* bind parameters for markers */ mysqli_stmt_bind_param($stmt, "s", $city); /* execute query */ mysqli_stmt_execute($stmt); /* bind result variables */ mysqli_stmt_bind_result($stmt, $district); /* fetch value */ mysqli_stmt_fetch($stmt); printf("%s is in district %s ", $city, $district); /* close statement */ mysqli_stmt_close($stmt); } /* close connection */ mysqli_close($link); ?> The above examples will output: Amersfoort is in district Utrecht SEE ALSO
mysqli_stmt_execute(3), mysqli_stmt_fetch(3), mysqli_stmt_bind_param(3), mysqli_stmt_bind_result(3), mysqli_stmt_close(3). PHP Documentation Group MYSQLI_PREPARE(3)
