SQLite3Stmt::bindValue
(PHP 5 >= 5.3.0)
SQLite3Stmt::bindValue — Binds the value of a parameter to a statement variable
说明
$sql_param
, mixed $value
[, int $type
] )Binds the value of a parameter to a statement variable.
参数
-
sql_param -
An string identifying the statement variable to which the value should be bound.
-
value -
The value to bind to a statement variable.
-
type -
The data type of the value 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.
-
返回值
Returns TRUE if the value is bound to the statement variable, FALSE
on failure.
范例
Example #1 SQLite3Stmt::bindValue() example
<?php
unlink ( 'mysqlitedb.db' );
$db = new SQLite3 ( 'mysqlitedb.db' );
$db -> exec ( 'CREATE TABLE foo (id INTEGER, bar STRING)' );
$db -> exec ( "INSERT INTO foo (id, bar) VALUES (1, 'This is a test')" );
$stmt = $db -> prepare ( 'SELECT bar FROM foo WHERE id=:id' );
$stmt -> bindValue ( ':id' , 1 , SQLITE3_INTEGER );
$result = $stmt -> execute ();
var_dump ( $result -> fetchArray ());
?> 用户评论:
[#1] andrevanzuydam at gmail dot com [2015-07-06 13:41:41]
I just want to say again,
Numbering for parameters starts at ONE!
This has caught me out quite a few times!
[#2] bohwaz [2015-01-18 04:49:10]
It might be a good idea to feed bindValue the type of the variable manually, or you might encounter weird stuff as the passed value is often treated as SQLITE3_TEXT and results in buggy queries.
For example:
<?php
$st = $db->prepare('SELECT * FROM test WHERE (a+1) = ?');
$st->bindValue(1, 2);
?>
Will never return any result as it is treated by SQLite as if the query was 'SELECT * FROM test WHERE (a+1) = "2"'. Instead you have to set the type manually:
<?php
$st = $db->prepare('SELECT * FROM test WHERE (a+1) = ?');
$st->bindValue(1, 2, \SQLITE3_INTEGER);
?>
And it will work. This bug is reported in https://bugs.php.net/bug.php?id=68849
Here is a simple function to help you make bindValue work correctly:
<?php
function getArgType($arg)
{
switch (gettype($arg))
{
case 'double': return SQLITE3_FLOAT;
case 'integer': return SQLITE3_INTEGER;
case 'boolean': return SQLITE3_INTEGER;
case 'NULL': return SQLITE3_NULL;
case 'string': return SQLITE3_TEXT;
default:
throw new \InvalidArgumentException('Argument is of invalid type '.gettype($arg));
}
}
?>
[#3] zeebinz at gmail dot com [2010-07-23 19:54:36]
Note that this also works with positional placeholders using the '?' token:
<?php
$stmt = $db->prepare('SELECT * FROM mytable WHERE foo = ? AND bar = ?');
$stmt->bindValue(1, 'somestring', SQLITE3_TEXT);
$stmt->bindValue(2, 42, SQLITE3_INTEGER);
?>
Positional numbering starts at 1.