SQLite3Stmt::bindValue()

(PHP 5 >= 5.3.0, PHP 7)

Binds the value of a parameter to a statement variable

说明

publicSQLite3Stmt::bindValue(mixed $sql_param, mixed $value[,int $type]): bool

Binds the value of a parameter to a statement variable.

Before PHP 7.2.14 and 7.3.0, respectively, once the statement has been executed,SQLite3Stmt::reset() needs to be called to be able to change the value of bound parameters.

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 with1.

$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.

As of PHP 7.0.7, if$typeis omitted, it is automatically detected from the type of the$value:boolean and integer are treated as SQLITE3_INTEGER,float as SQLITE3_FLOAT,null as SQLITE3_NULL and all others as SQLITE3_TEXT. Formerly, if$typehas been omitted, it has defaulted to SQLITE3_TEXT.

Note:

If$valueis NULL, it is always treated as SQLITE3_NULL, regardless of the given$type.

返回值

Returns TRUE if the value is bound to the statement variable,或者在失败时返回FALSE.

更新日志

范例

SQLite3Stmt::bindValue() example

<?php
$db = new SQLite3(':memory:');
$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(SQLITE3_ASSOC));
?>

以上例程会输出：

array(1) {
  ["bar"]=>
  string(14) "This is a test"
}

参见

• SQLite3Stmt::bindParam() Binds a parameter to a statement variable
• SQLite3::prepare() Prepares an SQL statement for execution

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.

I just want to say again, 
Numbering for parameters starts at ONE!
This has caught me out quite a few times!

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 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");
        }
      }
?>