[Libreoffice-commits] core.git: dbaccess/source

[Libreoffice Gerrit user]

 dbaccess/source/core/api/SingleSelectQueryComposer.cxx |   39 ++++++++++-------
 1 file changed, 23 insertions(+), 16 deletions(-)

New commits:
commit 6bebb05bd4b338e1ed3dac2c02b8b4186dc79675
Author:     Lionel Elie Mamane <lionel at mamane.lu>
AuthorDate: Sat Sep 15 07:19:28 2018 +0200
Commit:     Lionel Elie Mamane <lionel at mamane.lu>
CommitDate: Sat Sep 22 22:10:34 2018 +0200

    tdf#119569 try most likely to succeed method to get column metadata _before_
    
    We first try to prepare the statement and get metadata
    information. That's fine. Some DB engines/drivers will not give column
    information on an unexectured prepared statement. In that case, first
    try to execute the statement with all parameters set to NULL, which is
    likely to succeed. If not, keep "execute the raw SQL indiscriminately"
    as a last resort. I'm not sure it will ever be useful, though.
    
    Change-Id: I76b5fd6b2059e96fabe9a611c8e3ed115acfc964
    Reviewed-on: https://gerrit.libreoffice.org/60884
    Tested-by: Jenkins
    Reviewed-by: Lionel Elie Mamane <lionel at mamane.lu>

diff --git a/dbaccess/source/core/api/SingleSelectQueryComposer.cxx b/dbaccess/source/core/api/SingleSelectQueryComposer.cxx
index 4892df42be23..cfac370ca6b0 100644
--- a/dbaccess/source/core/api/SingleSelectQueryComposer.cxx
+++ b/dbaccess/source/core/api/SingleSelectQueryComposer.cxx
@@ -788,29 +788,36 @@ Reference< XNameAccess > SAL_CALL OSingleSelectQueryComposer::getColumns(  )
         }
         catch( const Exception& ) { }
 
-        try
+        if ( !xResultSetMeta.is() && xPreparedStatement.is() )
         {
-            if ( !xResultSetMeta.is() )
+            try
             {
-                xStatement.reset( Reference< XStatement >( m_xConnection->createStatement(), UNO_QUERY_THROW ) );
-                Reference< XPropertySet > xStatementProps( xStatement, UNO_QUERY_THROW );
-                try { xStatementProps->setPropertyValue( PROPERTY_ESCAPE_PROCESSING, makeAny( false ) ); }
-                catch ( const Exception& ) { DBG_UNHANDLED_EXCEPTION("dbaccess"); }
-                xResMetaDataSup.set( xStatement->executeQuery( sSQL ), UNO_QUERY_THROW );
+                //@see issue http://qa.openoffice.org/issues/show_bug.cgi?id=110111
+                // access returns a different order of column names when executing select * from
+                // and asking the columns from the metadata.
+                Reference< XParameters > xParameters( xPreparedStatement, UNO_QUERY_THROW );
+                Reference< XIndexAccess > xPara = getParameters();
+                for(sal_Int32 i = 1;i <= xPara->getCount();++i)
+                    xParameters->setNull(i,DataType::VARCHAR);
+                xResMetaDataSup.set(xPreparedStatement->executeQuery(), UNO_QUERY_THROW );
                 xResultSetMeta.set( xResMetaDataSup->getMetaData(), UNO_QUERY_THROW );
             }
+            catch( const Exception& ) { }
         }
-        catch( const Exception& )
+
+        if ( !xResultSetMeta.is() )
         {
-            //@see issue http://qa.openoffice.org/issues/show_bug.cgi?id=110111
-            // access returns a different order of column names when executing select * from
-            // and asking the columns from the metadata.
-            Reference< XParameters > xParameters( xPreparedStatement, UNO_QUERY_THROW );
-            Reference< XIndexAccess > xPara = getParameters();
-            for(sal_Int32 i = 1;i <= xPara->getCount();++i)
-                xParameters->setNull(i,DataType::VARCHAR);
-            xResMetaDataSup.set(xPreparedStatement->executeQuery(), UNO_QUERY_THROW );
+            xStatement.reset( Reference< XStatement >( m_xConnection->createStatement(), UNO_QUERY_THROW ) );
+            Reference< XPropertySet > xStatementProps( xStatement, UNO_QUERY_THROW );
+            try { xStatementProps->setPropertyValue( PROPERTY_ESCAPE_PROCESSING, makeAny( false ) ); }
+            catch ( const Exception& ) { DBG_UNHANDLED_EXCEPTION("dbaccess"); }
+            xResMetaDataSup.set( xStatement->executeQuery( sSQL ), UNO_QUERY_THROW );
             xResultSetMeta.set( xResMetaDataSup->getMetaData(), UNO_QUERY_THROW );
+
+            if (xResultSetMeta.is())
+            {
+                SAL_WARN("dbaccess", "OSingleSelectQueryComposer::getColumns failed to get xResultSetMeta from executed PreparedStatement, but got it from 'no escape processing' statement. SQL command:\n\t" << sSQL );
+            }
         }
 
         if ( aSelectColumns->get().empty() )