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sqlite_open (PHP 5) sqlite_open -- Opens a SQLite database and create the database if it does not exist 说明resource sqlite_open ( string filename [, int mode [, string &error_message]] ) Object oriented style (constructor): class SQLiteDatabase { __construct ( string filename [, int mode [, string &error_message]] ) }
Opens a SQLite database or creates the database if it does not exist.
参数
- filename
The filename of the SQLite database. If the file does not exist, SQLite
will attempt to create it. PHP must have write permissions to the file
if data is inserted, the database schema is modified or to create the
database if it does not exist.
- mode
The mode of the file. Intended to be used to open the database in
read-only mode. Presently, this parameter is ignored by the sqlite
library. The default value for mode is the octal value
0666 and this is the recommended value.
- error_message
Passed by reference and is set to hold a descriptive error message
explaining why the database could not be opened if there was an error.
返回值
Returns a resource (database handle) on success, FALSE on error.
例
例子 1. sqlite_open() example |
<?php
if ($db = sqlite_open('mysqlitedb', 0666, $sqliteerror)) {
sqlite_query($db, 'CREATE TABLE foo (bar varchar(10))');
sqlite_query($db, "INSERT INTO foo VALUES ('fnord')");
$result = sqlite_query($db, 'select bar from foo');
var_dump(sqlite_fetch_array($result));
} else {
die($sqliteerror);
}
?>
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注释提示:
On Unix platforms, SQLite is sensitive to scripts that use the fork() system call. If you
do have such a script, it is recommended that you close the handle prior
to forking and then re-open it in the child and/or parent.
For more information on this issue, see
The C language interface
to the SQLite library in the section entitled
Multi-Threading And SQLite.
提示:
It is not recommended to work with SQLite databases mounted on NFS
partitions. Since NFS is notoriously bad when it comes to locking you
may find that you cannot even open the database at all, and if it
succeeds, the locking behaviour may be undefined.
注:
Starting with SQLite library version 2.8.2, you can specify
:memory: as the filename to
create a database that lives only in the memory of the computer.
This is useful mostly for temporary processing, as the in-memory
database will be destroyed when the process ends. It can also be
useful when coupled with the ATTACH DATABASE SQL
statement to load other databases and move and query data between them.
注:
SQLite is 安全模式 and open_basedir aware.
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sqlite_num_rows