317 lines
6.3 KiB
PHP
317 lines
6.3 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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* @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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* SQLite Specific SQL
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*/
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class SQLite_SQL extends DB_SQL {
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/**
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* Convenience public function to create a new table
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*
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* @param string $name //Name of the table
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* @param array $columns //columns as straight array and/or column => type pairs
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* @param array $constraints // column => constraint pairs
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* @param array $indexes // column => index pairs
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* @return string
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*/
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public function create_table($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 IF NOT EXISTS \"{$name}\" (";
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$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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* SQL to drop the specified 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 IF EXISTS "'.$name.'"';
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}
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// --------------------------------------------------------------------------
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/**
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* Limit clause
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*
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* @param string $sql
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* @param int $limit
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* @param int $offset
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* @return string
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*/
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public function limit($sql, $limit, $offset=FALSE)
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{
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if ( ! is_numeric($offset))
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{
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return $sql." LIMIT {$limit}";
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}
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return $sql." LIMIT {$offset}, {$limit}";
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}
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// --------------------------------------------------------------------------
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/**
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* Random ordering keyword
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*
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* @return string
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*/
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public function random()
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{
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return ' RANDOM()';
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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 $excluded
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* @return string
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*/
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public function backup_data($excluded=array())
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{
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// Get a list of all the objects
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$sql = 'SELECT "name" FROM "sqlite_master"';
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if( ! empty($excluded))
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{
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$sql .= ' WHERE NOT IN("'.implode('","', $excluded).'")';
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}
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$res = $this->query($sql);
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$result = $res->fetchAll(PDO::FETCH_ASSOC);
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unset($res);
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$output_sql = '';
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// Get the data for each object
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foreach($result as $r)
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{
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$sql = 'SELECT * FROM "'.$r['name'].'"';
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$res = $this->query($sql);
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$obj_res = $res->fetchAll(PDO::FETCH_ASSOC);
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unset($res);
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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($row);
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// Quote values as needed by type
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for($i=0, $icount=count($row); $i<$icount; $i++)
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{
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$row[$i] = (is_numeric($row[$i])) ? $row[$i] : $this->quote($row[$i]);
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}
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$row_string = 'INSERT INTO "'.$r['name'].'" ("'.implode('","', $columns).'") VALUES ('.implode(',', $row).');';
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unset($row);
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$insert_rows[] = $row_string;
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}
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unset($obj_res);
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$output_sql .= "\n\n".implode("\n", $insert_rows);
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}
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return $output_sql;
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}
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// --------------------------------------------------------------------------
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/**
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* Create an SQL backup file for the current database's structure
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*
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* @return string
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*/
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public function backup_structure()
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{
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// Fairly easy for SQLite...just query the master table
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$sql = 'SELECT "sql" FROM "sqlite_master"';
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$res = $this->query($sql);
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$result = $res->fetchAll(PDO::FETCH_ASSOC);
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$sql_array = array();
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foreach($result as $r)
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{
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$sql_array[] = $r['sql'];
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}
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$sql_structure = implode("\n\n", $sql_array);
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return $sql_structure;
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}
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// --------------------------------------------------------------------------
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/**
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* Returns sql to list other databases
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*
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* @return FALSE
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*/
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public function db_list()
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{
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return FALSE;
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}
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// --------------------------------------------------------------------------
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/**
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* Returns sql to list tables
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*
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* @return string
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*/
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public function table_list()
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{
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return <<<SQL
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SELECT "name"
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FROM "sqlite_master"
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WHERE "type"='table'
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ORDER BY "name" DESC
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SQL;
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}
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// --------------------------------------------------------------------------
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/**
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* Overridden in SQLite class
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*
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* @return string
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*/
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public function system_table_list()
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{
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return FALSE;
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}
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// --------------------------------------------------------------------------
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/**
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* Returns sql to list views
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*
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* @return string
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*/
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public function view_list()
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{
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return <<<SQL
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SELECT "name" FROM "sqlite_master" WHERE "type" = 'view'
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SQL;
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}
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// --------------------------------------------------------------------------
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/**
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* Returns sql to list triggers
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*
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* @return FALSE
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*/
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public function trigger_list()
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{
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return FALSE;
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}
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// --------------------------------------------------------------------------
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/**
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* Return sql to list functions
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*
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* @return FALSE
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*/
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public function function_list()
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{
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return FALSE;
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}
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// --------------------------------------------------------------------------
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/**
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* Return sql to list stored procedures
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*
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* @return FALSE
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*/
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public function procedure_list()
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{
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return FALSE;
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}
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// --------------------------------------------------------------------------
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/**
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* Return sql to list sequences
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*
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* @return FALSE
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*/
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public function sequence_list()
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{
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return FALSE;
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}
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}
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//End of sqlite_sql.php
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