/**
* Reads the Database table in $table and creates SQL Statements for recreating structure and data then return the
* DUMP SQL. If you set the $filename params then the dump is store on filesystem too.
*
* Taken partially from phpMyAdmin and partially from Alain Wolf, Zurich - Switzerland
*
* Website: http://restkultur.ch/personal/wolf/scripts/db_backup/
*
* @brief Dump
*
* @param string $table Table name.
* @param string $filename Optional. Complete path of a filename where store the dump.
*
* @return string
*/
public function dumpWithTable($table, $filename = '')
{
// Prepare dump
$dump = '';
// Main information on dump
$dump .= "# --------------------------------------------------------\n";
$dump .= "# Date: " . date('j F, Y H:i:s') . "\n";
$dump .= "# Database: " . DB_NAME . "\n";
$dump .= "# Table: " . $table . "\n";
$dump .= "# --------------------------------------------------------\n";
// Add SQL statement to drop existing table
$dump .= "\n";
$dump .= "#\n";
$dump .= "# Delete any existing table `{$table}`\n";
$dump .= "#\n";
$dump .= "\n";
$dump .= "DROP TABLE IF EXISTS " . self::backquote($table) . ";\n";
// Comment in SQL-file
$dump .= "\n";
$dump .= "#\n";
$dump .= "# Table structure of table `{$table}`\n";
$dump .= "#\n";
$dump .= "\n";
// Get table structure
$query = 'SHOW CREATE TABLE ' . self::backquote($table);
$result = $this->mysqli ? mysqli_query($this->dbh, $query) : mysql_query($query, $this->dbh);
if ($result) {
// Get num rows
$num_rows = $this->mysqli ? mysqli_num_rows($result) : mysql_num_rows($result);
if ($num_rows > 0) {
$sql_create_arr = $this->mysqli ? mysqli_fetch_array($result) : mysql_fetch_array($result);
$dump .= $sql_create_arr[1];
}
if ($this->mysqli) {
mysqli_free_result($result);
} else {
mysql_free_result($result);
}
$dump .= ' ;';
}
// Get table contents
$query = 'SELECT * FROM ' . self::backquote($table);
/**
* Filter the query used to select the rows to dump.
*
* The dynamic portion of the hook name, $table, refers to the database table name.
*
* @param string $query The SQL query.
*/
$query = apply_filters('wpdk_db_dump_query-' . $table, $query);
$result = $this->mysqli ? mysqli_query($this->dbh, $query) : mysql_query($query, $this->dbh);
$fields_cnt = 0;
$rows_cnt = 0;
if ($result) {
$fields_cnt = $this->mysqli ? mysqli_num_fields($result) : mysql_num_fields($result);
$rows_cnt = $this->mysqli ? mysqli_num_rows($result) : mysql_num_rows($result);
}
// Comment in SQL-file
$dump .= "\n";
$dump .= "\n";
$dump .= "#\n";
$dump .= "# Data contents of table `{$table}` ({$rows_cnt} records)\n";
$dump .= "#\n";
$dump .= "\n";
// Lock table if insert available
$dump .= empty($rows_cnt) ? '' : "\nLOCK TABLES `{$table}` WRITE;\n";
/**
* Filter the addition SQL comment before printing the INSERT rows.
*
* The dynamic portion of the hook name, $table, refers to the database table name.
*
* @param string $comment Default empty.
*/
$dump .= apply_filters('wpdk_db_dump_info_before_inserts-' . $table, '');
// Checks whether the field is an integer or not
for ($j = 0; $j < $fields_cnt; $j++) {
if ($this->mysqli) {
$object = mysqli_fetch_field_direct($result, $j);
$field_set[$j] = $object->name;
$type = $object->type;
} else {
$field_set[$j] = self::backquote(mysql_field_name($result, $j));
$type = mysql_field_type($result, $j);
}
// Is number?
$field_num[$j] = in_array($type, array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'));
}
// Sets the scheme
$entries = 'INSERT INTO ' . self::backquote($table) . ' VALUES (';
$search = array('\\x00', '\\x0a', '\\x0d', '\\x1a');
//\x08\\x09, not required
$replace = array('\\0', '\\n', '\\r', '\\Z');
$current_row = 0;
$batch_write = 0;
while ($row = $this->mysqli ? mysqli_fetch_row($result) : mysql_fetch_row($result)) {
$current_row++;
// build the statement
for ($j = 0; $j < $fields_cnt; $j++) {
if (!isset($row[$j])) {
$values[] = 'NULL';
} elseif ($row[$j] === '0' || $row[$j] !== '') {
// a number
if ($field_num[$j]) {
$values[] = $row[$j];
} else {
$values[] = "'" . str_replace($search, $replace, self::addslashes($row[$j])) . "'";
}
} else {
$values[] = "''";
}
}
$dump .= "\n" . $entries . implode(', ', $values) . ") ;";
// write the rows in batches of 100
if ($batch_write === self::DUMP_SQL_FILE_CHUNCK_SIZE) {
$batch_write = 0;
// Write on disk
if (!empty($filename)) {
$result = WPDKFilesystem::append($dump, $filename);
// TODO Fires an error or filters to stop the execution
$dump = '';
}
}
$batch_write++;
unset($values);
}
if ($this->mysqli) {
mysqli_free_result($result);
} else {
mysql_free_result($result);
}
// Unlock tables
$dump .= empty($rows_cnt) ? '' : "\n\nUNLOCK TABLES;\n";
// Create footer/closing comment in SQL-file
$dump .= "\n";
$dump .= "\n";
$dump .= "#\n";
$dump .= "# End of data contents of table " . $table . "\n";
$dump .= "# --------------------------------------------------------\n";
$dump .= "\n";
$dump .= "\n";
// Write on disk
if (!empty($filename)) {
$result = WPDKFilesystem::append($dump, $filename);
// TODO Fires an error
}
return $dump;
}
