180 lines
3.8 KiB
PHP
180 lines
3.8 KiB
PHP
<?php
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/**
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* Query
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*
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* Free Query Builder / Database Abstraction Layer
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*
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* @package Query
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* @author Timothy J. Warren
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* @copyright Copyright (c) 2012
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* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
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*/
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// --------------------------------------------------------------------------
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/**
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* Posgres-specific backup, import and creation methods
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*
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* @package Query
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* @subpackage Drivers
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*/
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class PgSQL_Util extends DB_Util {
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/**
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* Save a reference to the current connection object
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*
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* @param object &$conn
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* @return void
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*/
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public function __construct(&$conn)
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{
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parent::__construct($conn);
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}
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/**
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* Database-specific method to create a new table
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*
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* @param string $name
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* @param array $columns
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* @param array $constraints
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* @param array $indexes
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* @return string
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*/
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public function create_table($name, $columns, array $constraints=array(), array $indexes=array())
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{
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$column_array = array();
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// Reorganize into an array indexed with column information
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// Eg $column_array[$colname] = array(
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// 'type' => ...,
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// 'constraint' => ...,
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// 'index' => ...,
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// )
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foreach($columns as $colname => $type)
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{
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if(is_numeric($colname))
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{
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$colname = $type;
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}
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$column_array[$colname] = array();
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$column_array[$colname]['type'] = ($type !== $colname) ? $type : '';
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}
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if( ! empty($constraints))
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{
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foreach($constraints as $col => $const)
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{
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$column_array[$col]['constraint'] = $const;
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}
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}
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// Join column definitons together
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$columns = array();
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foreach($column_array as $n => $props)
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{
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$str = "{$n} ";
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$str .= (isset($props['type'])) ? "{$props['type']} " : "";
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$str .= (isset($props['constraint'])) ? $props['constraint'] : "";
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$columns[] = $str;
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}
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// Generate the sql for the creation of the table
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$sql = "CREATE TABLE \"{$name}\" (";
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$sql .= implode(", ", $columns);
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$sql .= ")";
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return $sql;
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}
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// --------------------------------------------------------------------------
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/**
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* Database-specific SQL for dropping a table
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*
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* @param string $name
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* @return string
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*/
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public function delete_table($name)
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{
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return 'DROP TABLE "'.$name.'"';
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}
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// --------------------------------------------------------------------------
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/**
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* Create an SQL backup file for the current database's structure
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*
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* @return string
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*/
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public function backup_structure()
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{
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// @todo Implement Backup function
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return '';
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}
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// --------------------------------------------------------------------------
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/**
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* Create an SQL backup file for the current database's data
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*
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* @param array $exclude
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* @return string
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*/
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public function backup_data($exclude=array())
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{
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$tables = $this->get_tables();
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// Filter out the tables you don't want
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if( ! empty($exclude))
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{
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$tables = array_diff($tables, $exclude);
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}
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$output_sql = '';
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// Get the data for each object
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foreach($tables as $t)
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{
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$sql = 'SELECT * FROM "'.trim($t).'"';
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$res = $this->query($sql);
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$obj_res = $res->fetchAll(PDO::FETCH_ASSOC);
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// Don't add to the file if the table is empty
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if (count($obj_res) < 1) continue;
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$res = NULL;
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// Nab the column names by getting the keys of the first row
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$columns = @array_keys($obj_res[0]);
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$insert_rows = array();
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// Create the insert statements
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foreach($obj_res as $row)
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{
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$row = array_values($row);
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// Quote values as needed by type
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$row = array_map(array(&$this, 'quote'), $row);
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$row = array_map('trim', $row);
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$row_string = 'INSERT INTO "'.trim($t).'" ("'.implode('","', $columns).'") VALUES ('.implode(',', $row).');';
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$row = NULL;
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$insert_rows[] = $row_string;
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}
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$obj_res = NULL;
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$output_sql .= "\n\n".implode("\n", $insert_rows)."\n";
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}
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return $output_sql;
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}
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}
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// End of pgsql_util.php
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