summaryrefslogtreecommitdiffstats
path: root/user_guide_src/source/database/utilities.rst
diff options
context:
space:
mode:
Diffstat (limited to 'user_guide_src/source/database/utilities.rst')
-rw-r--r--user_guide_src/source/database/utilities.rst224
1 files changed, 224 insertions, 0 deletions
diff --git a/user_guide_src/source/database/utilities.rst b/user_guide_src/source/database/utilities.rst
new file mode 100644
index 000000000..b0920109f
--- /dev/null
+++ b/user_guide_src/source/database/utilities.rst
@@ -0,0 +1,224 @@
+######################
+Database Utility Class
+######################
+
+The Database Utility Class contains functions that help you manage your
+database.
+
+.. contents:: Table of Contents
+
+
+******************
+Function Reference
+******************
+
+Initializing the Utility Class
+==============================
+
+.. important:: In order to initialize the Utility class, your database
+ driver must already be running, since the utilities class relies on it.
+
+Load the Utility Class as follows::
+
+ $this->load->dbutil()
+
+Once initialized you will access the functions using the $this->dbutil
+object::
+
+ $this->dbutil->some_function()
+
+$this->dbutil->list_databases()
+================================
+
+Returns an array of database names::
+
+ $dbs = $this->dbutil->list_databases();
+
+ foreach ($dbs as $db)
+ {
+ echo $db;
+ }
+
+$this->dbutil->database_exists();
+==================================
+
+Sometimes it's helpful to know whether a particular database exists.
+Returns a boolean TRUE/FALSE. Usage example::
+
+ if ($this->dbutil->database_exists('database_name'))
+ {
+ // some code...
+ }
+
+Note: Replace *database_name* with the name of the table you are
+looking for. This function is case sensitive.
+
+$this->dbutil->optimize_table('table_name');
+==============================================
+
+.. note:: This features is only available for MySQL/MySQLi databases.
+
+Permits you to optimize a table using the table name specified in the
+first parameter. Returns TRUE/FALSE based on success or failure::
+
+ if ($this->dbutil->optimize_table('table_name'))
+ {
+ echo 'Success!';
+ }
+
+.. note:: Not all database platforms support table optimization.
+
+$this->dbutil->repair_table('table_name');
+============================================
+
+.. note:: This features is only available for MySQL/MySQLi databases.
+
+Permits you to repair a table using the table name specified in the
+first parameter. Returns TRUE/FALSE based on success or failure::
+
+ if ($this->dbutil->repair_table('table_name'))
+ {
+ echo 'Success!';
+ }
+
+.. note:: Not all database platforms support table repairs.
+
+$this->dbutil->optimize_database();
+====================================
+
+.. note:: This features is only available for MySQL/MySQLi databases.
+
+Permits you to optimize the database your DB class is currently
+connected to. Returns an array containing the DB status messages or
+FALSE on failure.
+
+::
+
+ $result = $this->dbutil->optimize_database();
+
+ if ($result !== FALSE)
+ {
+ print_r($result);
+ }
+
+.. note:: Not all database platforms support table optimization.
+
+$this->dbutil->csv_from_result($db_result)
+=============================================
+
+Permits you to generate a CSV file from a query result. The first
+parameter of the function must contain the result object from your
+query. Example::
+
+ $this->load->dbutil();
+
+ $query = $this->db->query("SELECT * FROM mytable");
+
+ echo $this->dbutil->csv_from_result($query);
+
+The second, third, and fourth parameters allow you to set the delimiter
+newline, and enclosure characters respectively. By default tabs are
+used as the delimiter, "\n" is used as a new line, and a double-quote
+is used as the enclosure. Example::
+
+ $delimiter = ",";
+ $newline = "\r\n";
+ $enclosure = '"';
+
+ echo $this->dbutil->csv_from_result($query, $delimiter, $newline, $enclosure);
+
+.. important:: This function will NOT write the CSV file for you. It
+ simply creates the CSV layout. If you need to write the file
+ use the :doc:`File Helper <../helpers/file_helper>`.
+
+$this->dbutil->xml_from_result($db_result)
+=============================================
+
+Permits you to generate an XML file from a query result. The first
+parameter expects a query result object, the second may contain an
+optional array of config parameters. Example::
+
+ $this->load->dbutil();
+
+ $query = $this->db->query("SELECT * FROM mytable");
+
+ $config = array (
+ 'root' => 'root',
+ 'element' => 'element',
+ 'newline' => "\n",
+ 'tab' => "\t"
+ );
+
+ echo $this->dbutil->xml_from_result($query, $config);
+
+.. important:: This function will NOT write the XML file for you. It
+ simply creates the XML layout. If you need to write the file
+ use the :doc:`File Helper <../helpers/file_helper>`.
+
+$this->dbutil->backup()
+=======================
+
+Permits you to backup your full database or individual tables. The
+backup data can be compressed in either Zip or Gzip format.
+
+.. note:: This features is only available for MySQL databases.
+
+.. note:: Due to the limited execution time and memory available to PHP,
+ backing up very large databases may not be possible. If your database is
+ very large you might need to backup directly from your SQL server via
+ the command line, or have your server admin do it for you if you do not
+ have root privileges.
+
+Usage Example
+-------------
+
+::
+
+ // Load the DB utility class
+ $this->load->dbutil();
+
+ // Backup your entire database and assign it to a variable
+ $backup =& $this->dbutil->backup();
+
+ // Load the file helper and write the file to your server
+ $this->load->helper('file');
+ write_file('/path/to/mybackup.gz', $backup);
+
+ // Load the download helper and send the file to your desktop
+ $this->load->helper('download');
+ force_download('mybackup.gz', $backup);
+
+Setting Backup Preferences
+--------------------------
+
+Backup preferences are set by submitting an array of values to the first
+parameter of the backup function. Example::
+
+ $prefs = array(
+ 'tables' => array('table1', 'table2'), // Array of tables to backup.
+ 'ignore' => array(), // List of tables to omit from the backup
+ 'format' => 'txt', // gzip, zip, txt
+ 'filename' => 'mybackup.sql', // File name - NEEDED ONLY WITH ZIP FILES
+ 'add_drop' => TRUE, // Whether to add DROP TABLE statements to backup file
+ 'add_insert' => TRUE, // Whether to add INSERT data to backup file
+ 'newline' => "\n" // Newline character used in backup file
+ );
+
+ $this->dbutil->backup($prefs);
+
+Description of Backup Preferences
+---------------------------------
+
+=============== ======================= ======================= ========================================================================
+Preference Default Value Options Description
+=============== ======================= ======================= ========================================================================
+**tables** empty array None An array of tables you want backed up. If left blank all tables will be
+ exported.
+**ignore** empty array None An array of tables you want the backup routine to ignore.
+**format** gzip gzip, zip, txt The file format of the export file.
+**filename** the current date/time None The name of the backed-up file. The name is needed only if you are using
+ zip compression.
+**add_drop** TRUE TRUE/FALSE Whether to include DROP TABLE statements in your SQL export file.
+**add_insert** TRUE TRUE/FALSE Whether to include INSERT statements in your SQL export file.
+**newline** "\\n" "\\n", "\\r", "\\r\\n" Type of newline to use in your SQL export file.
+=============== ======================= ======================= ======================================================================== \ No newline at end of file
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-07-15 03:14:03 +0200