(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SQLite3Stmt::bindParam — Binds a parameter to a statement variable
Binds a parameter to a statement variable.
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.
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.
varThe parameter to bind to a statement variable.
typeThe 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 var: bool
and int 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.
注意:
If
varisnull, it is always treated asSQLITE3_NULL, regardless of the giventype.
Returns true if the parameter is bound to the statement variable, false
on failure.
| 版本 | 说明 |
|---|---|
| 7.4.0 |
param now also supports the @param
notation.
|
示例 #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"
}