PHP 7.1.20 Released

SQLite3::openBlob

(PHP 5 >= 5.3.0, PHP 7)

SQLite3::openBlobOpens a stream resource to read a BLOB

説明

public resource SQLite3::openBlob ( string $table , string $column , int $rowid [, string $dbname = "main" [, int $flags = SQLITE3_OPEN_READONLY ]] )

Opens a stream resource to read or write a BLOB, which would be selected by:

SELECT column FROM dbname.table WHERE rowid = rowid

注意: It is not possible to change the size of a BLOB by writing to the stream. Instead, an UPDATE statement has to be executed, possibly using SQLite's zeroblob() function to set the desired BLOB size.

パラメータ

table

The table name.

column

The column name.

rowid

The row ID.

dbname

The symbolic name of the DB

flags

Either SQLITE3_OPEN_READONLY or SQLITE3_OPEN_READWRITE to open the stream for reading only, or for reading and writing, respectively.

返り値

Returns a stream resource, 失敗した場合に FALSE を返します.

変更履歴

バージョン 説明
7.2.0 The flags parameter has been added, allowing to write BLOBs; formerly only reading was supported.

例1 SQLite3::openBlob() example

<?php
$conn 
= new SQLite3(':memory:');
$conn->exec('CREATE TABLE test (text text)');
$conn->exec("INSERT INTO test VALUES ('Lorem ipsum')");
$stream $conn->openBlob('test''text'1);
echo 
stream_get_contents($stream);
fclose($stream); // mandatory, otherwise the next line would fail
$conn->close();
?>

上の例の出力は以下となります。

Lorem ipsum

例2 Incrementally writing a BLOB

<?php
$conn 
= new SQLite3(':memory:');
$conn->exec('CREATE TABLE test (text text)');
$conn->exec("INSERT INTO test VALUES (zeroblob(36))");
$stream $conn->openBlob('test''text'1'main'SQLITE3_OPEN_READWRITE);
for (
$i 0$i 3$i++) {
    
fwrite($stream,  "Lorem ipsum\n");
}
fclose($stream);
echo 
$conn->querySingle("SELECT text FROM test");
$conn->close();
?>

上の例の出力は以下となります。

Lorem ipsum
Lorem ipsum
Lorem ipsum

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