SQLite3Stmt::bindValue

(PHP 5 >= 5.3.0)

SQLite3Stmt::bindValue — Binds the value of a parameter to a statement variable

说明

public bool SQLite3Stmt::bindValue ( string $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.