MySql development of automatic synchronization table structure

show table from rd_db;
show create table added_table_name;

select 
 COLUMN_NAME,COLUMN_TYPE,IS_NULLABLE,COLUMN_DEFAULT,COLUMN_COMMENT,EXTRA 
from 
 information_schema.columns
where 
  TABLE_SCHEMA='rd_db'
  and TABLE_NAME = 'rd_table';

        for (Column column : sourceTable.getColumns().values()) {
            if (targetTable.getColumns().get(column.getName()) == null) {
                // If the corresponding target does not have this field, directly alter
                String sql = "alter table " + target.getSchema() + "." + targetTable.getTableName() + " add " + column
                        .getName() + " ";
                sql += column.getType() + " ";
                if (column.getIsNull().equals("NO")) {
                    sql += "NOT NULL ";
                } else {
                    sql += "NULL";
                }
                if (column.getDefaultValue() != null) {
                    sql += "DEFAULT " + SqlUtil.getDbString(column.getDefaultValue()) + " ";
                }
                if (column.getComment() != null) {
                    sql += "COMMENT " + SqlUtil.getDbString(column.getComment()) + " ";
                }
                if (after != null) {
                    sql += "after " + after;
                }
                changeSql.add(sql+";");
            } else {
                // Check the corresponding source and target attributes String sql =
                        "alter table " + target.getSchema() + "." + targetTable.getTableName() + " change " + column
                                .getName() + " ";
                Column sourceColumn = column;
                Column targetColumn = targetTable.getColumns().get(sourceColumn.getName());
                // Compare the two fields. If null is returned, it indicates consistency. String sqlExtend = compareSingleColumn(sourceColumn, targetColumn);
                if (sqlExtend != null) {
                    changeSql.add(sql + sqlExtend+";");
                }
            }
            after = column.getName();
        }

sourceHost=127.0.0.1:3306
sourceUser=root
sourcePass=123123123
sourceSchema=mystique_db
sourceCharset=utf8

targetHost=127.0.0.1:3306
targetUser=root
targetPass=123123123
targetSchema=mystique_test
targetCharset=utf8

autoExecute=YES //This indicates automatic synchronization

alchemystar.runner.ShellRunner 

alter table mystique_test.t_test_3 change id id bigint(20) NOT NULL AUTO_INCREMENT COMMENT ''
alter table mystique_test.t_test_3 add index (name)
alter table mystique_test.t_test_3 drop index name_id
alter table mystique_test.t_test_3 add id_2 varchar(50) NULL DEFAULT '' COMMENT '' after name