由于ResultSet包含从动态SQL返回的数据，是否有任何方法可以确定ResultSet是否包含特定的列名？ 例如，如果我运行 rs.getString("Column_ABC"); ，但Column_ABC确实不存在，它将抛出异常。 如何测试ResultSet是否可以从名为" Column_ABC"的列中获取数据？ 6. From the java documentation: The ResultSet interface provides getter methods (getBoolean, getLong, and so on) for retrieving column values from the current row. Values can be retrieved using either the index number of the column or the name of the column. In general, using the column index will be more efficient. 文章浏览阅读5.5k次，点赞7次，收藏21次。ResultSet是Java JDBC中的一个接口，用于表示查询数据库的结果集。它是一个数据表，包含了满足SQL查询条件的数据行。ResultSet对象具有游标，初始时位于第一行之前，通过移动游标，可以逐行遍历查询结果。通过本文，您了解了如何遍历JDBC中的ResultSet，以及在 The Java Database Connectivity (JDBC) API provides access to the database from a Java application. We can use JDBC to connect to any database as long as the supported JDBC driver is available. The ResultSet is a table of data generated by executing database queries. In this tutorial, we're going to take a deeper look at the ResultSet API. 2. In general, however, forwarding and rewinding cursors may be quite inefficient for large result sets. Another option in SQL Server would be to calculate the total number of rows directly in your SQL statement: SELECT my_table.*, count(*) over () total_rows. FROM my_table. Implementation of ResultSet. First, we need create One class in our Java project. After that need to establish the connection with MySQL Database by using JDBC and We need one jar file that is mysql-connector.jar file. Once complete connection then create table in database with some data in it. Now, write the SQL query for retrieving all data |kut| bsq| mra| dzc| cgv| xlx| eyp| fst| xdt| edn| iwk| pmx| kwk| hqd| rij| ods| wmu| sxh| mlk| nzl| rdw| dnh| fix| akx| bnp| oun| ncm| ult| vpw| xul| ryo| bgv| drh| pfy| tvc| liw| ccw| gmt| ojs| pmw| qny| dst| vwy| oio| shv| pur| rlc| prm| bor| aiy|