SQLite3Stmt::bindParam()
(PHP 5 >= 5.3.0, PHP 7)
Binds a parameter to a statement variable
说明
public SQLite3Stmt::bindParam(mixed $sql_param, mixed&$param[,int $type]): bool
Binds a parameter to a statement variable.
CautionBefore 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.
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.
- $param
The parameter to bind to a statement variable.
- $type
The data type of the parameter to bind.
SQLITE3_INTEGER
: The value is a signed integer, stored in 1, 2, 3, 4, 6, or 8 bytes depending on the magnitude of the value.SQLITE3_FLOAT
: The value is a floating point value, stored as an 8-byte IEEE floating point number.SQLITE3_TEXT
: The value is a text string, stored using the database encoding(UTF-8, UTF-16BE or UTF-16-LE).SQLITE3_BLOB
: The value is a blob of data, stored exactly as it was input.SQLITE3_NULL
: The value is a NULL value.
As of PHP 7.0.7, if$typeis omitted, it is automatically detected from the type of the$param:boolean and integer are treated as
SQLITE3_INTEGER
,float asSQLITE3_FLOAT
,null asSQLITE3_NULL
and all others asSQLITE3_TEXT
. Formerly, if$typehas been omitted, it has defaulted toSQLITE3_TEXT
.Note:
If$paramis
NULL
, it is always treated asSQLITE3_NULL
, regardless of the given$type.
返回值
Returns TRUE
if the parameter is bound to the statement variable,FALSE
on failure.
更新日志
版本 | 说明 |
---|---|
7.4.0 | $sql_paramnow also supports the@paramnotation. |
范例
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" }
参见
- SQLite3Stmt::bindValue() Binds the value of a parameter to a statement variable
- SQLite3::prepare() Prepares an SQL statement for execution
Note that this bindParam needs a variable as the second parameter. Use bindValue if you want to bind a value, such an array item.