# SQLite3Stmt::bindParam

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SQLite3Stmt::bindParam — Binds a parameter to a statement variable

### 说明

public SQLite3Stmt::bindParam(string|int `$param`, mixed `&$var`, int `$type` = `SQLITE3_TEXT`): bool

Binds a parameter to a statement variable.

警告

Before PHP 7.2.14 and 7.3.0, respectively, SQLite3Stmt::reset() must be called after the first call to SQLite3Stmt::execute() if the bound value should be properly updated on following calls to SQLite3Stmt::execute(). If SQLite3Stmt::reset() is not called, the bound value will not change, even if the value assigned to the variable passed to SQLite3Stmt::bindParam() has changed, or SQLite3Stmt::bindParam() has been called again.

### 参数

`param`

  Either a string (for named parameters) or an int (for positional parameters) identifying the statement variable to which the value should be bound. If a named parameter does not start with a colon (`:`) or an at sign (`@`), a colon (`:`) is automatically preprended. Positional parameters start with `1`.

`var`

  The parameter to bind to a statement variable.

`type`

  The data type of the parameter to bind.

  - `SQLITE3_INTEGER`: The value is a signed integer, stored in 1, 2, 3, 4, 6, or 8 bytes depending on the magnitude of the value.

  - `SQLITE3_FLOAT`: The value is a floating point value, stored as an 8-byte IEEE floating point number.

  - `SQLITE3_TEXT`: The value is a text string, stored using the database encoding (UTF-8, UTF-16BE or UTF-16-LE).

  - `SQLITE3_BLOB`: The value is a blob of data, stored exactly as it was input.

  - `SQLITE3_NULL`: The value is a NULL value.

  As of PHP 7.0.7, if `type` is omitted, it is automatically detected from the type of the `var`: bool and int are treated as `SQLITE3_INTEGER`, float as `SQLITE3_FLOAT`, null as `SQLITE3_NULL` and all others as `SQLITE3_TEXT`. Formerly, if `type` has been omitted, it has defaulted to `SQLITE3_TEXT`.

  > 注意:

  > If `var` is `null`, it is always treated as `SQLITE3_NULL`, regardless of the given `type`.

### 返回值

Returns `true` if the parameter is bound to the statement variable, `false` on failure.

### 更新日志

版本 | 说明
--- | ---
7.4.0 | `param` now also supports the `@param` notation.

### 示例

示例 #1 SQLite3Stmt::bindParam() Usage

This example shows how a single prepared statement with a single parameter binding can be used to insert multiple rows with different values.

`<?php
$db = new SQLite3(':memory:');
$db->exec("CREATE TABLE foo (bar TEXT)");
$stmt = $db->prepare("INSERT INTO foo VALUES (:bar)");
$stmt->bindParam(':bar', $bar, SQLITE3_TEXT);
$bar = 'baz';
$stmt->execute();
$bar = 42;
$stmt->execute();
$res = $db->query("SELECT * FROM foo");
while (($row = $res->fetchArray(SQLITE3_ASSOC))) {
var_dump($row);
}
?>`

以上示例会输出：

    array(1) {
      ["bar"]=>
      string(3) "baz"
    }
    array(1) {
      ["bar"]=>
      string(2) "42"
    }

### 参见

- SQLite3Stmt::bindValue() - Binds the value of a parameter to a statement variable
- SQLite3::prepare() - Prepares an SQL statement for execution

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