/**
     * 获取数据库下的所有数据库表名
     *
     * @return Map<String, List<String>> key为数据库名称，value为该数据库下的所有表名
     */
    public Map<String, List<String>> getDbTablesNamesMap(){
        Map<String, List<String>> dbTableNamesMap = new HashMap<>();
        try {
            //获取数据库的元数据
            DatabaseMetaData dbMetaData = getConnection().getMetaData();
            //从元数据中获取到所有的表名
            ResultSet rs = dbMetaData.getTables(null, null, null,new String[] { "TABLE" });
            List<String> tableNames;
            while(rs.next()) {
                String tableName = rs.getString("TABLE_NAME");
                String curTableDbName = rs.getString("TABLE_CAT");
                String tableNameType = rs.getString("TABLE_TYPE");
                //表模式（可能为空）,在oracle中获取的是命名空间
                String tableNameSchema = rs.getString("TABLE_SCHEM");
                String tableNameRemark = rs.getString("REMARKS");
                System.out.println("表名: " + tableName + "，表所属数据库: " + curTableDbName + "，表类型: " + tableNameType + "，表模式: " + tableNameSchema + "，表备注: " + tableNameRemark);
                //跳过mysql自带的系统库
                if("sys".equalsIgnoreCase(curTableDbName)){
                    continue;
                }
                if(dbTableNamesMap.containsKey(curTableDbName)){
                    tableNames = dbTableNamesMap.get(curTableDbName);
                }else{
                    tableNames = new ArrayList<>();
                }
                tableNames.add(tableName);
                dbTableNamesMap.put(curTableDbName,tableNames);
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }

        close();
        return dbTableNamesMap;
    }

public static List<String> prepareSqlStatementWithStringFormat(boolean isForFiles) {
        String sql = "alter table %s ADD COLUMN create_time DATETIME COMMENT ‘创建时间‘,ADD COLUMN created_by_id BIGINT(20) DEFAULT NULL COMMENT ‘创建人id‘, ADD COLUMN update_time DATETIME COMMENT ‘修改时间‘, ADD COLUMN last_updated_by_id BIGINT(20) DEFAULT NULL COMMENT ‘修改人id‘";
        List<String> sqlStatements = new ArrayList<>();
        Map<String, List<String>> dbTableNamesMap = DbUtils.INSTANCE.getDbTablesNamesMap();
        dbTableNamesMap.forEach((dbName,tableNames) -> {
            for (String tableName : tableNames) {
                String record = dbName + "." + tableName;
                String sqlStatement = String.format(sql, record);
                //如果是要写入文件，则每条生成的sql语句，需追加分号
                if(isForFiles){
                    sqlStatement = sqlStatement + ";";
                }
                System.out.println(sqlStatement);
                sqlStatements.add(sqlStatement);

            }

        });
        return sqlStatements;

    }

public static void writeSqlStatement2File(List<String> sqlStatements,String filePath){

        try {
            File file = new File(filePath);
            if(!file.exists()){
                file.createNewFile();
            }
            FileUtil.writeUtf8Lines(sqlStatements,file);
            System.out.println("数据库脚本写入"+filePath+"成功");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("数据库脚本写入"+filePath+"失败");
        }


    }