resultset

问题 First off, here's my SQL query: SELECT research_cost, tech_name, (SELECT research_cost FROM technologies WHERE research_cost <= USERS_RESEARCH_POINTS_VALUE ORDER BY research_cost DESC LIMIT 1) as research_prev, (SELECT cost FROM technology_costs WHERE id = 18 LIMIT 1) as technology_cost FROM `technologies` JOIN technology_costs ON id = COUNT_OF_TECHS_USER_LEARNED WHERE research_cost > USERS_RESEARCH_POINTS_VALUE ORDER BY research_cost ASC LIMIT 1 Website link: http://www.joemajewski.com

问题 I'm using Scala 2.10 and have problems with Slick (plain queries, java.sql.ResultSet). If I write queries like Q.query[String, ResultSet](query).list(rs.getString("id")) eclipse will tell me could not find implicit value for parameter rconv: scala.slick.jdbc.GetResult[java.sql.ResultSet] My most important source for this issue ( http://slick.typesafe.com/doc/0.11.2/sql.html ) does not help. How do I write these implicit conversions? And is there any other, familar way of representing

问题 I have to read in a large record set, process it, then write it out to a flat file. The large result set comes from a Stored Proc in SQL 2000. I currently have: var results = session.CreateSQLQuery("exec usp_SalesExtract").List(); I would like to be able to read the result set row by row, to reduce the memory foot print Thanks 回答1: NHibernate is not designed for that usage. Plus, you're not really using its features. So, in this case, it's better to use raw ADO.NET. 回答2: Why not just use SQL

问题 i have a sql query, i want to append the html in it and return the resultset into single cell below is my query SELECT TOP (@TOP) C.Title FROM CrossArticle_Article C INNER JOIN CrossArticle_ArticleToCategory A2C ON C.Id = A2C.ArticleId INNER JOIN CrossArticle_Category CC ON A2C.CategoryId = CC.Id INNER JOIN crossarticle_url CU ON C.Id = CU.articleid WHERE CC.Id = @CategoryID AND CC.PortalId = 6 GROUP BY C.TITLE, CU.URL, C.PublishDate ORDER BY C.PublishDate DESC currently it will display in

问题 Mysql driver has options to set so that resultset will not be read completely in memory as in here http://dev.mysql.com/doc/connector-j/en/connector-j-reference-implementation-notes.html#ResultSet. Is there an equivalent option for H2? Thanks, 回答1: H2 currently does not support server side cursors. However, it buffers large result sets to disk (as a separate file, or as a temporary table). The disadvantage is speed, but it should not be a memory usage problems. You can set the size of the

问题 I'd like to pass out a result set from a function that executes a query and closes the connection. But the ResultSet gets invalidated as soon as its parent Connection is closed and throws java.sql.SQLException: Operation not allowed after ResultSet closed How to avoid this? 回答1: You can't. If you want to get all the data, loop the ResultSet and insert the data into a collection of yours. Take a look at commons-dbutils - it has a lot of useful helpers. 回答2: Also consider using a disconnected

问题 I have created a single jar for Java 7 & 8 for a JDBC driver (using -source/-target compile options). However, I am having difficulty compiling applications that use the new/overloaded methods in the ResultSet interface: //New in Java 8 updateObject(int columnIndex, Object x, SQLType targetSqlType) // Available in Java 7 updateObject(int columnIndex, Object x, int targetSqlType) Note that SQLType is a new interface introduced in Java 8. I have compiled the driver using Java 8, which worked

问题 If I have to loop two times after each other using while(rs.next()) for different reasons through the same ResultSet , what can I do so that the ResultSet doesn't close automatically and to prevent the 'ResultSet is closed Exception'? I tried using resultset.first() to move the cursor back to the first row after the first loop but this error fired even on this statement! 回答1: This depends on your driver used. Some driver are not able to reset a ResultSet . In this case you will get an

问题 I am new to google spanner and I have run a query and found about 50k rows of data. I want to export that resultset to my local machine like .csv or into a google sheet. Previously I have used TOAD where I have an export button, but here I do not see any of those options. Any suggestions please. 回答1: The gcloud spanner databases execute-sql command allows you to run SQL statements on the command line and redirect output to a file. The --format=csv global argument should output in CSV. https:/

问题 I have the following table create table LIST_PIPE_TABLE ( ID INT, ITEM VARCHAR(4000), IS_FOLDER VARCHAR(10) ) with 3 rows of data insert into LIST_PIPE_TABLE values(1,'Victorias Secret','true') insert into LIST_PIPE_TABLE values(2,'Porsche','true') insert into LIST_PIPE_TABLE values(3,'Babbolat','false') And a stored procedure that should return resultset CREATE or alter PROCEDURE LIST_PIPE RETURNS ( col1 varchar(4000), col2 varchar(10) ) AS begin FOR SELECT ITEM AS ITEM ,IS_FOLDER AS IS