From 7eea4f8906c21c1061cc9f21100e5597aae648b9 Mon Sep 17 00:00:00 2001 From: admin Date: Sun, 24 Sep 2006 18:13:17 +0000 Subject: --- system/database/drivers/postgre/postgre_driver.php | 484 +++++++++++++++++++++ 1 file changed, 484 insertions(+) create mode 100644 system/database/drivers/postgre/postgre_driver.php (limited to 'system/database') diff --git a/system/database/drivers/postgre/postgre_driver.php b/system/database/drivers/postgre/postgre_driver.php new file mode 100644 index 000000000..92767c42b --- /dev/null +++ b/system/database/drivers/postgre/postgre_driver.php @@ -0,0 +1,484 @@ +port == '') ? '' : " port=".$this->port; + + return pg_connect("host=".$this->hostname.$port." dbname=".$this->database." user=".$this->username." password=".$this->password); + } + + // -------------------------------------------------------------------- + + /** + * Persistent database connection + * + * @access private called by the base class + * @return resource + */ + function db_pconnect() + { + $port = ($this->port == '') ? '' : " port=".$this->port; + + return pg_pconnect("host=".$this->hostname.$port." dbname=".$this->database." user=".$this->username." password=".$this->password); + } + + // -------------------------------------------------------------------- + + /** + * Select the database + * + * @access private called by the base class + * @return resource + */ + function db_select() + { + // Not needed for Postgre so we'll return TRUE + return TRUE; + } + + // -------------------------------------------------------------------- + + /** + * Execute the query + * + * @access private called by the base class + * @param string an SQL query + * @return resource + */ + function _execute($sql) + { + $sql = $this->_prep_query($sql); + return @pg_query($this->conn_id, $sql); + } + + // -------------------------------------------------------------------- + + /** + * Prep the query + * + * If needed, each database adapter can prep the query string + * + * @access private called by execute() + * @param string an SQL query + * @return string + */ + function _prep_query($sql) + { + return $sql; + } + + // -------------------------------------------------------------------- + + /** + * Begin Transaction + * + * @access public + * @return bool + */ + function trans_begin($test_mode = FALSE) + { + if ( ! $this->trans_enabled) + { + return TRUE; + } + + // When transactions are nested we only begin/commit/rollback the outermost ones + if ($this->_trans_depth > 0) + { + return TRUE; + } + + // Reset the transaction failure flag. + // If the $test_mode flag is set to TRUE transactions will be rolled back + // even if the queries produce a successful result. + $this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE; + + return @pg_exec($this->conn_id, "begin"); + } + + // -------------------------------------------------------------------- + + /** + * Commit Transaction + * + * @access public + * @return bool + */ + function trans_commit() + { + if ( ! $this->trans_enabled) + { + return TRUE; + } + + // When transactions are nested we only begin/commit/rollback the outermost ones + if ($this->_trans_depth > 0) + { + return TRUE; + } + + return @pg_exec($this->conn_id, "commit"); + } + + // -------------------------------------------------------------------- + + /** + * Rollback Transaction + * + * @access public + * @return bool + */ + function trans_rollback() + { + if ( ! $this->trans_enabled) + { + return TRUE; + } + + // When transactions are nested we only begin/commit/rollback the outermost ones + if ($this->_trans_depth > 0) + { + return TRUE; + } + + return @pg_exec($this->conn_id, "rollback"); + } + + // -------------------------------------------------------------------- + + /** + * Escape String + * + * @access public + * @param string + * @return string + */ + function escape_str($str) + { + return pg_escape_string($str); + } + + // -------------------------------------------------------------------- + + /** + * Affected Rows + * + * @access public + * @return integer + */ + function affected_rows() + { + return @pg_affected_rows($this->result_id); + } + + // -------------------------------------------------------------------- + + /** + * Insert ID + * + * @access public + * @return integer + */ + function insert_id() + { + $v = pg_version($this->conn_id); + $v = $v['server']; + + $table = func_num_args() > 0 ? func_get_arg(0) : null; + $column = func_num_args() > 1 ? func_get_arg(1) : null; + + if ($table == null && $v >= '8.1') + { + $sql='SELECT LASTVAL() as ins_id'; + } + elseif ($table != null && $column != null && $v >= '8.0') + { + $sql = sprintf("SELECT pg_get_serial_sequence('%s','%s') as seq", $table, $column); + $query = $this->query($sql); + $row = $query->row(); + $sql = sprintf("SELECT CURRVAL('%s') as ins_id", $row->seq); + } + elseif ($table != null) + { + // seq_name passed in table parameter + $sql = sprintf("SELECT CURRVAL('%s') as ins_id", $table); + } + else + { + return pg_last_oid($this->result_id); + } + $query = $this->query($sql); + $row = $query->row(); + return $row->ins_id; + } + + // -------------------------------------------------------------------- + + /** + * "Count All" query + * + * Generates a platform-specific query string that counts all records in + * the specified database + * + * @access public + * @param string + * @return string + */ + function count_all($table = '') + { + if ($table == '') + return '0'; + + $query = $this->query('SELECT COUNT(*) AS numrows FROM "'.$this->dbprefix.$table.'"'); + + if ($query->num_rows() == 0) + return '0'; + + $row = $query->row(); + return $row->numrows; + } + + // -------------------------------------------------------------------- + + /** + * The error message string + * + * @access public + * @return string + */ + function error_message() + { + return pg_last_error($this->conn_id); + } + + // -------------------------------------------------------------------- + + /** + * The error message number + * + * @access public + * @return integer + */ + function error_number() + { + return ''; + } + + // -------------------------------------------------------------------- + + /** + * Escape Table Name + * + * This function adds backticks if the table name has a period + * in it. Some DBs will get cranky unless periods are escaped. + * + * @access public + * @param string the table name + * @return string + */ + function escape_table($table) + { + if (stristr($table, '.')) + { + $table = '"'.preg_replace("/\./", '"."', $table).'"'; + } + + return $table; + } + + // -------------------------------------------------------------------- + + /** + * Field data query + * + * Generates a platform-specific query so that the column data can be retrieved + * + * @access public + * @param string the table name + * @return object + */ + function _field_data($table) + { + $sql = "SELECT * FROM ".$this->escape_table($table)." LIMIT 1"; + $query = $this->query($sql); + return $query->field_data(); + } + + // -------------------------------------------------------------------- + + /** + * Insert statement + * + * Generates a platform-specific insert string from the supplied data + * + * @access public + * @param string the table name + * @param array the insert keys + * @param array the insert values + * @return string + */ + function _insert($table, $keys, $values) + { + return "INSERT INTO ".$this->escape_table($table)." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")"; + } + + // -------------------------------------------------------------------- + + /** + * Update statement + * + * Generates a platform-specific update string from the supplied data + * + * @access public + * @param string the table name + * @param array the update data + * @param array the where clause + * @return string + */ + function _update($table, $values, $where) + { + foreach($values as $key => $val) + { + $valstr[] = $key." = ".$val; + } + + return "UPDATE ".$this->escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where); + } + + // -------------------------------------------------------------------- + + /** + * Delete statement + * + * Generates a platform-specific delete string from the supplied data + * + * @access public + * @param string the table name + * @param array the where clause + * @return string + */ + function _delete($table, $where) + { + return "DELETE FROM ".$this->escape_table($table)." WHERE ".implode(" ", $where); + } + + // -------------------------------------------------------------------- + + /** + * Version number query string + * + * @access public + * @return string + */ + function _version() + { + return "SELECT version() AS ver"; + } + + /** + * Show table query + * + * Generates a platform-specific query string so that the table names can be fetched + * + * @access public + * @return string + */ + function _show_tables() + { + return "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'"; + } + + // -------------------------------------------------------------------- + + /** + * Show columnn query + * + * Generates a platform-specific query string so that the column names can be fetched + * + * @access public + * @param string the table name + * @return string + */ + function _show_columns($table = '') + { + return "SELECT column_name FROM information_schema.columns WHERE table_name ='".$this->escape_table($table)."'"; + } + + // -------------------------------------------------------------------- + + /** + * Limit string + * + * Generates a platform-specific LIMIT clause + * + * @access public + * @param string the sql query string + * @param integer the number of rows to limit the query to + * @param integer the offset value + * @return string + */ + function _limit($sql, $limit, $offset) + { + $sql .= "LIMIT ".$limit; + + if ($offset > 0) + { + $sql .= " OFFSET ".$offset; + } + + return $sql; + } + + // -------------------------------------------------------------------- + + /** + * Close DB Connection + * + * @access public + * @param resource + * @return void + */ + function _close($conn_id) + { + pg_close($conn_id); + } + +} + +?> \ No newline at end of file -- cgit v1.2.3-24-g4f1b