C++ (Cpp) BuildStatement示例

示例#1

QgsMssqlFeatureIterator::QgsMssqlFeatureIterator( QgsMssqlFeatureSource* source, bool ownSource, const QgsFeatureRequest& request )
    : QgsAbstractFeatureIteratorFromSource<QgsMssqlFeatureSource>( source, ownSource, request )
    , mExpressionCompiled( false )
    , mOrderByCompiled( false )
{
  mClosed = false;
  mQuery = nullptr;

  mParser.IsGeography = mSource->mIsGeography;

  BuildStatement( request );

  // connect to the database
  mDatabase = QgsMssqlProvider::GetDatabase( mSource->mService, mSource->mHost, mSource->mDatabaseName, mSource->mUserName, mSource->mPassword );

  if ( !mDatabase.open() )
  {
    QgsDebugMsg( "Failed to open database" );
    QgsDebugMsg( mDatabase.lastError().text() );
    return;
  }

  // create sql query
  mQuery = new QSqlQuery( mDatabase );

  // start selection
  rewind();
}

示例#2

QgsMssqlFeatureIterator::QgsMssqlFeatureIterator( QgsMssqlFeatureSource* source, bool ownSource, const QgsFeatureRequest& request )
    : QgsAbstractFeatureIteratorFromSource( source, ownSource, request )
{
  mClosed = false;
  mQuery = NULL;

  mParser.IsGeography = mSource->mIsGeography;
  
  BuildStatement( request );

  // connect to the database
  mDatabase = GetDatabase(mSource->mDriver, mSource->mHost, mSource->mDatabaseName, mSource->mUserName, mSource->mPassword);
  
  if ( !mDatabase.open() )
  {
    QgsDebugMsg( "Failed to open database" );
    QString msg = mDatabase.lastError().text();
    QgsDebugMsg( msg );
    return;
  }

  // create sql query
  mQuery = new QSqlQuery( mDatabase );
 
  // start selection
  rewind();
}

示例#3

文件： qgsdb2featureiterator.cpp 项目： Gustry/QGIS

QgsDb2FeatureIterator::QgsDb2FeatureIterator( QgsDb2FeatureSource* source, bool ownSource, const QgsFeatureRequest& request )
    : QgsAbstractFeatureIteratorFromSource<QgsDb2FeatureSource>( source, ownSource, request )
{
  mClosed = false;
  mQuery = nullptr;
  mFetchCount = 0;

  BuildStatement( request );

  // connect to the database
  QString errMsg;
  mDatabase = QgsDb2Provider::getDatabase( mSource->mConnInfo, errMsg );

  if ( !errMsg.isEmpty() )
  {
    QgsDebugMsg( "Failed to open database: " + errMsg );
    return;
  }

  // create sql query
  mQuery = new QSqlQuery( mDatabase );

  // start selection
  rewind();
}

示例#4

文件： ogrmssqlspatialtablelayer.cpp 项目： sylvainallard/gdal

CPLODBCStatement *OGRMSSQLSpatialTableLayer::GetStatement()

{
    if( poStmt == NULL )
    {
        poStmt = BuildStatement(BuildFields());
        iNextShapeId = 0;
    }

    return poStmt;
}

示例#5

文件： qgsmssqlfeatureiterator.cpp 项目： exlimit/QGIS

QgsMssqlFeatureIterator::QgsMssqlFeatureIterator( QgsMssqlFeatureSource *source, bool ownSource, const QgsFeatureRequest &request )
  : QgsAbstractFeatureIteratorFromSource<QgsMssqlFeatureSource>( source, ownSource, request )
{
  mClosed = false;

  mParser.IsGeography = mSource->mIsGeography;

  if ( mRequest.destinationCrs().isValid() && mRequest.destinationCrs() != mSource->mCrs )
  {
    mTransform = QgsCoordinateTransform( mSource->mCrs, mRequest.destinationCrs() );
  }
  try
  {
    mFilterRect = filterRectToSourceCrs( mTransform );
  }
  catch ( QgsCsException & )
  {
    // can't reproject mFilterRect
    mClosed = true;
    return;
  }

  BuildStatement( request );

  // connect to the database
  mDatabase = QgsMssqlProvider::GetDatabase( mSource->mService, mSource->mHost, mSource->mDatabaseName, mSource->mUserName, mSource->mPassword );

  if ( !mDatabase.open() )
  {
    QgsDebugMsg( "Failed to open database" );
    QgsDebugMsg( mDatabase.lastError().text() );
    return;
  }

  // create sql query
  mQuery.reset( new QSqlQuery( mDatabase ) );

  // start selection
  rewind();
}

示例#6

文件： ogrmssqlspatialtablelayer.cpp 项目： sylvainallard/gdal

int OGRMSSQLSpatialTableLayer::GetFeatureCount( int bForce )

{
    GetLayerDefn();

    if( TestCapability(OLCFastFeatureCount) == FALSE )
        return OGRMSSQLSpatialLayer::GetFeatureCount( bForce );

    ClearStatement();
        
    CPLODBCStatement* poStatement = BuildStatement( "count(*)" );

    if (poStatement == NULL || !poStatement->Fetch())
    {
        delete poStatement;
        return OGRMSSQLSpatialLayer::GetFeatureCount( bForce );
    }

    int nRet = atoi(poStatement->GetColData( 0 ));
    delete poStatement;
    return nRet;
}

示例#7

文件： qgsdb2featureiterator.cpp 项目： giohappy/QGIS

QgsDb2FeatureIterator::QgsDb2FeatureIterator( QgsDb2FeatureSource *source, bool ownSource, const QgsFeatureRequest &request )
  : QgsAbstractFeatureIteratorFromSource<QgsDb2FeatureSource>( source, ownSource, request )
{
  mClosed = false;

  if ( mRequest.destinationCrs().isValid() && mRequest.destinationCrs() != mSource->mCrs )
  {
    mTransform = QgsCoordinateTransform( mSource->mCrs, mRequest.destinationCrs() );
  }
  try
  {
    mFilterRect = filterRectToSourceCrs( mTransform );
  }
  catch ( QgsCsException & )
  {
    // can't reproject mFilterRect
    mClosed = true;
    return;
  }

  BuildStatement( request );

  // connect to the database
  QString errMsg;
  mDatabase = QgsDb2Provider::getDatabase( mSource->mConnInfo, errMsg );

  if ( !errMsg.isEmpty() )
  {
    QgsDebugMsg( "Failed to open database: " + errMsg );
    return;
  }

  // create sql query
  mQuery.reset( new QSqlQuery( mDatabase ) );

  // start selection
  rewind();
}