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# mysqli::prepare

# mysqli_prepare

(PHP 5)

mysqli::prepare -- mysqli_prepare — Prepare an SQL statement for execution

### Descrição

Estilo orientado a objetos

mysqli_stmt mysqli::prepare ( string `$query` )

Estilo de procedimentos

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() and/or mysqli_stmt_bind_result() before executing the statement or fetching rows.

### Parâmetros

`link`

  Apenas para estilo de procedimento: Um identificador de conexão retornado por mysqli_connect() or mysqli_init()

`query`

  The query, as a string.

  > Nota: 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.

  > Nota: 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 comparison 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.

### Valor Retornado

mysqli_prepare() returns a statement object or `FALSE` if an error occurred.

### Exemplos

Exemplo #1 mysqli::prepare example

Estilo orientado a objetos

`<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", 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\n", $city, $district);
/* close statement */
$stmt->close();
}
/* close connection */
$mysqli->close();
?>`

Estilo de procedimentos

`<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", 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\n", $city, $district);
/* close statement */
mysqli_stmt_close($stmt);
}
/* close connection */
mysqli_close($link);
?>`

The above examples will output:

    Amersfoort is in district Utrecht

### Veja Também

- mysqli_stmt_execute() - Executa uma preparada query
- mysqli_stmt_fetch() - Obtém resultados de um preparado comando e os coloca nas determinadas variáveis
- mysqli_stmt_bind_param() - Passa variáveis para um preparado comando como parâmetros
- mysqli_stmt_bind_result() - Passa variáveis para um preparado comando por resultado armazenado
- mysqli_stmt_close() - Closes a prepared statement

mysqli::poll
mysqli::query
MySQLi
PHP Manual