chdb_create

(PECL chdb >= 0.1.0)

chdb_create — Creates a chdb file

说明

bool chdb_create ( string $pathname , array $data )

chdb_create() creates a chdb file containing the specified key-value pairs.

Note:
chdb files are not portable across little-endian and big-endian environments. Except for that, they are portable across different architectures. Also compatibility across different versions of chdb is not guaranteed.

参数

pathname

The name of the file to create.

If a file with the same name already exists, it is overwritten.

data

An array containing the key-value pairs to store in the chdb file.

Keys and values are converted to strings before being written to the file, as chdb only support the string type. Note that binary strings are supported as well, both as keys and values.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

错误／异常

Throws an exception in case the chdb file hasn't been successfully created.

范例

Example #1 chdb_create() example


<?php

$data = array(
    'key1' => 'value1',
    'key2' => 'value2',
    // ...
);
chdb_create('data.chdb', $data);

?>

The above example will generate a chdb file named data.chdb and containing the key-value pairs defined in $data.

User Contributed Notes

jille at hexon dot cx 12-Sep-2012 11:39


Please keep in mind that you shouldn't write to a database that is being actively used. If another process is currently reading the database it might crash.



A safe way to update your database is:

<?php

chdb_create('tmp.db', $data);

rename('tmp.db', 'database.db');

?>