Application using CallableStatement.execute() method did not return any data

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Title	Application using CallableStatement.execute() method did not return any data

URL Name	execute-method-invoked-by-callablestatement-object-did-not-return-any-data-even-if-the-data-exists

Article Number	000144537

Environment	Product: Connect for JDBC SQL Server driver Version: 5.1 OS: Linux 7.x , 64 bit Database: SQL Server 2016 Application: All supported applications

Question/Problem Description

Application using CallableStatement.execute() method to invoke a stored procedure did not return any data even if the data was there in the database table.

Snippet of the application code was the following:
boolean res = callableStatement.execute();
   System.out.println("call execute to invoke stored procedure");

   if(res) {
       rs = callableStatement.getResultSet();
   System.out.println("Selecting first row from table...");
   while(rs.next()) {
   System.out.println(rs.getInt(1));
   }
    } else {
        System.out.println("No data returned");
    }
   }

Steps to Reproduce

Clarifying Information

Error Message

Defect Number

Enhancement Number

Cause

The application code was not correct when calling CallableStatement.execute() method.

Resolution

According to the JDBC Specification ( reference given below in "Notes" ), the proper code snippet when using execute() method from a CallableStatement Object is the following:

CallableStatement cstmt = conn.prepareCall(procCall);
boolean retval = cstmt.execute();
ResultSet rs;
int count;
do {
     if (retval == false)
   { count = cstmt.getUpdateCount();
   if (count == -1) { // no more results break; }
      else { // process update count}
     }
   else { // ResultSet
   rs = cstmt.getResultSet();
   // process ResultSet
   }
   retval = cstmt.getMoreResults();
}
while (true);

Workaround

Notes

References to other documentation:
JDBC™ 4.2 Specification, 13.3.3.3 Returning Unknown or Multiple Results
http://download.oracle.com/otn-pub/jcp/jdbc-4_2-mrel2-spec/jdbc4.2-fr-spec.pdf

Last Modified Date	11/13/2017 11:23 PM

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Application using CallableStatement.execute() method did not return any data

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