SQLite3Stmt::bindValue
(PHP 5 >= 5.3.0, PHP 7)
SQLite3Stmt::bindValue — Binds the value of a parameter to a statement variable
Описание
Binds the value of a parameter to a statement variable.
Список параметров
-
sql_param -
Either a string or an int 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.
-
Возвращаемые значения
Returns TRUE if the value is bound to the statement variable, FALSE
on failure.
Примеры
Пример #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());
?>
- PHP Руководство
- Функции по категориям
- Индекс функций
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- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- SQLite3
- Функция SQLite3Stmt::bindParam() - Binds a parameter to a statement variable
- Функция SQLite3Stmt::bindValue() - Binds the value of a parameter to a statement variable
- Функция SQLite3Stmt::clear() - Clears all current bound parameters
- Функция SQLite3Stmt::close() - Closes the prepared statement
- Функция SQLite3Stmt::execute() - Executes a prepared statement and returns a result set object
- Функция SQLite3Stmt::paramCount() - Returns the number of parameters within the prepared statement
- SQLite3Stmt::readOnly()
- Функция SQLite3Stmt::reset() - Resets the prepared statement
Коментарии
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.
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));
}
}
?>
I just want to say again,
Numbering for parameters starts at ONE!
This has caught me out quite a few times!
I used following logic to prepare statements, It handles both Values and Arrays ( taking help from bohwaz note) :
<?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($arg));
}
}
foreach ($params as $index => $val) {
// indexing start from 1 in Sqlite statement
if (is_array($val)) {
$ok = $stmt->bindParam($index + 1, $val);
} else {
$ok = $stmt->bindValue($index + 1, $val, getArgType($val));
}
if (!$ok) {
throw new Exception("Unable to bind param: $val");
}
}
?>