public boolean isInitialized() {
   return jdbcMetadata.getErrMsg() == null;
 }
 public boolean isTableExists(String schemaName, String tableName) {
   return jdbcMetadata.isTableExists(schemaName, tableName);
 }
 public int getColumnDataType(String schemaName, String tableName, String colName) {
   return jdbcMetadata.getColumnDataType(schemaName, tableName, colName);
 }