/// <summary>
/// 访问 <see cref="BatchCommandExpression"/> 表达式。
/// </summary>
/// <param name="batch"></param>
/// <returns></returns>
protected override Expression VisitBatch(BatchCommandExpression batch)
{
_isAsync = _isAsync || batch.IsAsync;
var operation = batch.Operation;
if (operation.Body is InsertCommandExpression insert)
{
if (batch.Arguments.Count == 0)
{
return(_isAsync ? Expression.Constant(Task.FromResult(-1)) : Expression.Constant(-1));
}
var rewriter = insert.Update(insert.Table, VisitColumnAssignments(insert.Assignments));
if (rewriter != insert)
{
operation = Expression.Lambda(rewriter, operation.Parameters.ToArray());
}
}
batch = batch.Update(batch.Input, operation, batch.Arguments);
return(BuildExecuteBatch(batch));
}
/// <summary>
/// 浏览 <see cref="BatchCommandExpression"/> 表达式。
/// </summary>
/// <param name="batch"></param>
/// <returns></returns>
protected override Expression VisitBatch(BatchCommandExpression batch)
{
if (batch.Arguments.Count == 0)
{
return(Expression.Constant(-1));
}
var operation = batch.Operation;
if (operation.Body is CommandExpression command)
{
if (command.NodeType == DbExpressionType.Insert)
{
var insert = command as InsertCommandExpression;
var rewriter = insert.Update(insert.Table, VisitColumnAssignments(insert.Assignments));
if (rewriter != insert)
{
operation = Expression.Lambda(rewriter, operation.Parameters.ToArray());
}
}
}
batch = batch.Update(batch.Input, operation, batch.Arguments);
return(BuildExecuteBatch(batch));
}
protected override Expression VisitBatch(BatchCommandExpression batch)
{
var operation = batch.Operation;
var command = operation.Body as CommandExpression;
if (command != null)
{
if (command.NodeType == DbExpressionType.Insert)
{
var insert = command as InsertCommandExpression;
var rewriter = insert.Update(insert.Table, VisitColumnAssignments(insert.Assignments));
if (rewriter != insert)
{
operation = LambdaExpression.Lambda(rewriter, operation.Parameters.ToArray());
}
}
}
batch = batch.Update(batch.Input, operation);
return(BuildExecuteBatch(batch));
}
