[teiid-issues] [JBoss JIRA] (TEIID-5403) Support the use of variables in client SQL query

Support the use of variables in client SQL query ------------------------------------------------ Key: TEIID-5403 URL: https://issues.jboss.org/browse/TEIID-5403 Project: Teiid Issue Type: Enhancement Reporter: SHI HONG CHIN Assignee: Steven Hawkins In Microsoft SQL Server, when writing SQL query, I can directly declare and set local variables, and then use it as much as I like in the rest of SQL query. Example: {code:java} DECLARE @PARAM1 VARCHAR(100); SET @PARAM1 = ?; SELECT <SOME COLUMNS> FROM TABLEA LEFT OUTER JOIN ( SELECT <SOME COLUMNS> FROM TABLEB WHERE COLUMN1 = @PARAM1 ) T1 ON T1.COLUMN2 = TABLEA.COLUMN3 WHERE TABLEA.COLUMN4 = @PARAM1 UNION ALL SELECT <SOME COLUMNS> FROM TABLEC WHERE TABLEC.COLUMN5 = @PARAM1; {code} In above example, "@PARAM1" is the local variable that been used multiple times in the query. The benefits: 1. In programming, I only need to set the parameter for one time. For example, when using Java PreparedStatement's setString(int parameterIndex, String x) function, I only need to write "statement.setString(1, param1);" instead of writing "statement.setString(1, param1); statement.setString(2, param1); statement.setString(3, param1); ....." to set the same value. 2. I no need to create a procedure. However, in Teiid, I cannot find anyway to achieve this. In Teiid, please implement the support of local variables in client SQL query.