public WhereSql and(String condition, Object value) {
        if (!isFirstCondition) {
            sql.append(" AND ");
        }
        isFirstCondition = false;
        sql.append(condition);
        params.add(value);
        return this;
    }
@author Robert HG (254963746@qq.com) on 3/9/16.
lts-core/src/main/java/com/github/ltsopensource/store/jdbc/builder/WhereSql.java