PHP SQLite3Stmt Binds a parameter to a statement variable

说明

public SQLite3Stmt::bindParam ( mixed $sql_param , mixed &$param [, int $type ] ) : bool

Binds a parameter to a statement variable.

Caution

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

sql_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.

param

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 param: boolean and integer 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.

Note:

If param 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	`sql_param` now also supports the @param notation.

范例

Example #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);
}
?>

以上例程会输出：

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