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schema.php
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schema.php
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<?php
class DatabaseSchema {
protected $_databaseName = '';
protected $_tableNames = array();
protected $_tables = array();
protected $_con = null;
protected $_schema = '';
public function __construct($settings) {
$this->_databaseName = $settings[3];
$this->_con = new mysqli($settings[0], $settings[1], $settings[2], $settings[3]);
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
}
public function getTableNames() {
if (!$this->_tableNames) {
$databaseName = $this->_databaseName;
$query = "SELECT table_name FROM information_schema.tables WHERE table_schema = '$databaseName' ";
$res = $this->_con->query($query);
$res->data_seek(0);
while ($row = $res->fetch_assoc()) {
$this->_tableNames[] = $row['table_name'];
}
}
return $this->_tableNames;
}
public function getTables() {
if (!$this->_tables) {
$databaseName = $this->_databaseName;
foreach ($this->getTableNames() as $table) {
$query = "select * from information_schema.columns where table_name='$table' and TABLE_SCHEMA = '$databaseName' ";
$res = $this->_con->query($query);
$res->data_seek(0);
while ($row = $res->fetch_assoc()) {
$tableArray = array();
$fields = array_keys($row);
foreach ($fields as $field) {
$tableArray[$field] = $row[$field];
}
$this->_tables[$table][$row['COLUMN_NAME']] = $tableArray;
}
}
}
return $this->_tables;
}
public function my_array_diff_assoc($a, $a2) {
$diff = array();
foreach ($a as $table) {
if (!in_array($table, $a2)) {
$diff[] = $table;
}
}
foreach ($a2 as $table) {
if (!in_array($table, $a)) {
$diff[] = $table;
}
}
return $diff;
}
public function compareDatabase(DatabaseSchema $schema2) {
$tableDifferences = $this->my_array_diff_assoc($this->getTableNames(), $schema2->getTableNames());
$schema1Str = '';
$schema2Str = '';
foreach ($tableDifferences as $diff) {
if (in_array($diff, $this->getTableNames())) {
$schema1Str .= DatabaseSchema::createTable($this->getTables()[$diff], $diff);
} else {
$schema2Str.= DatabaseSchema::createTable($schema2->getTables()[$diff], $diff);
}
}
$schema1Table = $this->getTables();
$schema2Table = $schema2->getTables();
$ignoreField = array('TABLE_SCHEMA', 'PRIVILEGES', 'ORDINAL_POSITION', 'TABLE_CATALOG');
foreach ($schema1Table as $tableName => $tableArray) {
foreach ($tableArray as $field => $fieldArray) {
foreach ($fieldArray as $attribute => $value) {
if ($value != $schema2Table[$tableName][$field][$attribute] && !in_array($attribute, $ignoreField)) {
$schema2Str .= DatabaseSchema::alterTable($fieldArray, $tableName);
break;
}
}
}
}
$schemaStr = "Schema 1:" . $schema1Str . "\n-------------------------------------------------------------------------------------------------------\nSchema 2: \n" . $schema2Str;
$this->_schema = $schemaStr;
echo str_replace("\n", '<br/>', $schemaStr);
}
public function forceSqlDownload() {
$schemaStr = $this->_schema;
$fileName = "schema.sql";
header("Content-type: application/force-download");
header("Content-Disposition: attachment; filename=$fileName;size=" . strlen($schemaStr));
echo $schemaStr;
exit;
}
public static function alterTable($column, $table) {
$primaryKey = '';
$uniqueKey = '';
$columnName = $column['COLUMN_NAME'];
$columnType = $column['COLUMN_TYPE'];
$columnIsNull = ($column['IS_NULLABLE'] == 'NO') ? 'NOT NULL' : 'NULL';
$columnExtra = ($column['EXTRA'] == 'auto_increment') ? 'AUTO_INCREMENT' : '';
$columnDefault = '';
if ($column['COLUMN_DEFAULT']) {
if ($column['COLUMN_DEFAULT'] == 'CURRENT_TIMESTAMP') {
$columnDefault = "DEFAULT " . $column['COLUMN_DEFAULT'];
} else {
$columnDefault = "DEFAULT '" . $column['COLUMN_DEFAULT'] . "'";
}
}
$columnComment = '';
$columnCharacter = '';
if ($column['COLLATION_NAME']) {
$columnCharacter = "CHARACTER SET " . $column['CHARACTER_SET_NAME'] . " COLLATE " . $column['COLLATION_NAME'];
}
if ($column['COLUMN_COMMENT']) {
$columnComment = "COMMENT '" . $column['COLUMN_COMMENT'] . "'";
}
if ($column['COLUMN_KEY'] == 'PRI') {
$primaryKey = "ALTER TABLE `$table` DROP PRIMARY KEY, ADD PRIMARY KEY(`$columnName`);\n";
}
if ($column['COLUMN_KEY'] == 'UNI') {
$uniqueKey = "ALTER TABLE `$table` ADD UNIQUE( `$columnName`);\n";
}
$alterStr = trim("ALTER TABLE `$table` CHANGE `$columnName` `$columnName` $columnType $columnCharacter $columnIsNull $columnDefault $columnExtra $columnComment") . ";\n";
if ($primaryKey) {
$alterStr .= $primaryKey;
}
if ($uniqueKey) {
$alterStr.= $uniqueKey;
}
return $alterStr;
}
public static function createTable($tableArray, $table) {
$tableStr = "CREATE TABLE IF NOT EXISTS `$table` (\n ";
$primaryKey = '';
$uniqueKeys = array();
$hasAutoIncrement = false;
foreach ($tableArray as $column) {
$columnName = $column['COLUMN_NAME'];
$columnType = $column['COLUMN_TYPE'];
$columnIsNull = ($column['IS_NULLABLE'] == 'NO') ? 'NOT NULL' : 'DEFAULT NULL';
$columnExtra = ($column['EXTRA'] == 'auto_increment') ? 'AUTO_INCREMENT' : '';
$columnDefault = '';
if ($column['COLUMN_DEFAULT']) {
if ($column['COLUMN_DEFAULT'] == 'CURRENT_TIMESTAMP') {
$columnDefault = "DEFAULT " . $column['COLUMN_DEFAULT'];
} else {
$columnDefault = "DEFAULT '" . $column['COLUMN_DEFAULT'] . "'";
}
}
$columnComment = '';
$columnCharacter = '';
if ($columnExtra) {
$hasAutoIncrement = true;
}
if ($column['COLLATION_NAME']) {
$columnCharacter = "CHARACTER SET " . $column['CHARACTER_SET_NAME'] . " COLLATE " . $column['COLLATION_NAME'];
}
if ($column['COLUMN_COMMENT']) {
$columnComment = "COMMENT '" . $column['COLUMN_COMMENT'] . "'";
}
if ($column['COLUMN_KEY'] == 'PRI') {
$primaryKey = "PRIMARY KEY (`$columnName`)";
}
if ($column['COLUMN_KEY'] == 'UNI') {
$uniqueKeys[] = "UNIQUE KEY `$columnName` (`$columnName`)";
}
$columnStr = trim("`$columnName` $columnType $columnCharacter $columnIsNull $columnDefault $columnExtra $columnComment") . ",\n";
$tableStr .= $columnStr;
}
$tableStr .= $primaryKey;
if ($uniqueKeys) {
$tableStr .= ",\n";
}
$tableStr .= implode(",\n", $uniqueKeys);
$tableStr .="\n)ENGINE=MyISAM DEFAULT CHARSET=utf8 ";
if ($hasAutoIncrement) {
$tableStr .= "AUTO_INCREMENT=1 ;\n";
} else {
$tableStr .= ";\n";
}
return $tableStr;
}
}
$settings = array('localhost', 'root', '123456', 'development');
$settings2 = array('localhost', 'root', '123456', 'second_schema');
$db = new DatabaseSchema($settings);
$db2 = new DatabaseSchema($settings2);
$db->compareDatabase($db2);
?>