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).

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