通过druid解析sql查询语句的查询字段、过滤条件，并且获取排序

1.获取表名

sql为数据表语句 select id as id2 from testDb.testTable where id = ${id}

          //数据类型可以输入其他的
          DbType dbType = DbType.valueOf("MYSQL".toLowerCase());
           //sql为数据表语句  select id as id2 from testDb.testTable where id = ${id}
            List statementList = SQLUtils.parseStatements(sql, "MYSQL".toLowerCase());
            for (SQLStatement statement : statementList) {
                if (statement instanceof SQLSelectStatement) {
                    SchemaStatVisitor visitor = new SchemaStatVisitor(dbType);
                    statement.accept(visitor);
                    //解析表名
                    SQLSelectStatement selectStatement = (SQLSelectStatement) statement;
                    SQLSelectQueryBlock queryBlock = selectStatement.getSelect().getFirstQueryBlock();
                    Map tables = visitor.getTables();
            
                    tables.forEach((tableName, tableStat) -> {
                      //判断sql语句
                        if ("Select".equals(tableStat.toString())) {
                            //这里获取表名
                            tableNameList.add(tableName.getName().contains(".") ? tableName.getName().split("\\.")[1] : tableName.getName());
                        }
                    });
                  }

2.获取查询字段

 //查询字段
 List selectList = queryBlock.getSelectList();
 if (CollectionUtils.isNotEmpty(selectList)) {
                        selectList.stream().forEach(sqlSelectItem -> {
                            String outStr = sqlSelectItem.toString().trim();
                            //去除字段前面的 表的别名
                            if (outStr.contains(".")) {
                                outStr = outStr.split("\\.", -1)[1];
                            }
                            if (outStr.contains("AS")) {
                                outStr = outStr.split("AS", -1)[0].trim();
                                //获取字段名
                                outputParamDto.setEnName(outStr);
                                //获取别名
                                outputParamDto.setAliasName(sqlSelectItem.getAlias());
                            } else {
                                  //获取字段名
                                outputParamDto.setEnName(outStr);
                             }
                            });  
                 }

3.获取过滤条件

 //查询过滤条件
                    List conditions = visitor.getConditions();
                    if (CollectionUtils.isNotEmpty(conditions)) {
                        conditions.stream().forEach(row -> {
                            //获取过滤条件  id=12  获取 id
                            String columnName = row.getColumn().getName();
                            //获取操作符  id=12  获取 = 号
                            String operator = row.getOperator();
                            });
                    }
  

4.获取排序条件

             //查询order by
              List orderByColumns = visitor.getOrderByColumns();
               if (CollectionUtils.isNotEmpty(orderByColumns)) {
                                orderByColumns.stream().forEach(orderByColumn -> {
                                    if (outputParamDto.getEnName().equals(orderByColumn.getName())) {
                                        if (BizConstants.ASC_PARAM.equals(orderByColumn.getAttributes().get("orderBy.type"))) {
                                            outputParamDto.setSort(BizConstants.ASC_PARAM);
                                        } else {
                                            outputParamDto.setSort(BizConstants.DESC_PARAM);
                                        }
                                    }
                                });
               }