public override Expression GetDeleteExpression(MappingEntity entity, Expression instance, LambdaExpression deleteCheck)
{
var commands = new List <Expression>();
var tables = this.mapping.GetTables(entity);
if (tables.Count < 2)
{
return(base.GetDeleteExpression(entity, instance, deleteCheck));
}
foreach (var table in this.GetDependencyOrderedTables(entity).Reverse())
{
var tex = new DbTableExpression(new TableAlias(), entity, this.mapping.GetTableName(table));
var where = this.GetIdentityCheck(tex, entity, instance);
commands.Add(new DbDeleteCommand(tex, where));
}
var block = new DbBlockCommand(commands) as Expression;
if (deleteCheck != null)
{
return(new DbIFCommand(this.GetEntityStateTest(entity, instance, deleteCheck), block, null));
}
return(block);
}
protected DbBlockCommand UpdateBlock(DbBlockCommand block, IList <Expression> commands)
{
if (block.Commands != commands)
{
return(new DbBlockCommand(commands));
}
return(block);
}
public override Expression GetUpdateExpression(MappingEntity entity, Expression instance, LambdaExpression updateCheck, LambdaExpression selector, Expression exp)
{
var tables = this.mapping.GetTables(entity);
if (tables.Count < 2)
{
return(base.GetUpdateExpression(entity, instance, updateCheck, selector, exp));
}
var commands = new List <Expression>();
foreach (var table in this.GetDependencyOrderedTables(entity))
{
var tex = new DbTableExpression(new TableAlias(), entity, this.mapping.GetTableName(table));
var assignments = this.GetColumnAssignments(tex, instance, entity, (e, m) => this.mapping.GetAlias(e, m) == this.mapping.GetAlias(table) && this.mapping.IsUpdatable(e, m), null);
var where = this.GetIdentityCheck(tex, entity, instance);
commands.Add(new DbUpdateCommand(tex, where, assignments));
}
if (selector != null)
{
commands.Add(new DbIFCommand
(
this.Translator.Linguist.Language.GetRowsAffectedExpression(commands[commands.Count - 1]).GreaterThan(Expression.Constant(0)),
this.GetUpdateResult(entity, instance, selector), exp)
);
}
else if (exp != null)
{
commands.Add(new DbIFCommand
(
this.Translator.Linguist.Language.GetRowsAffectedExpression(commands[commands.Count - 1]).LessThanOrEqual(Expression.Constant(0)),
exp,
null
));
}
var block = new DbBlockCommand(commands) as Expression;
if (updateCheck != null)
{
return(new DbIFCommand(this.GetEntityStateTest(entity, instance, updateCheck), block, null));
}
return(block);
}
protected virtual bool CompareBlock(DbBlockCommand x, DbBlockCommand y)
{
if (x.Commands.Count != y.Commands.Count)
{
return(false);
}
for (int i = 0, n = x.Commands.Count; i < n; i++)
{
if (this.Compare(x.Commands[i], y.Commands[i]) == false)
{
return(false);
}
}
return(true);
}
protected override Expression VisitBlock(DbBlockCommand block)
{
throw new NotSupportedException();
}
protected virtual Expression VisitBlock(DbBlockCommand block)
{
return(this.UpdateBlock(block, this.VisitExpressionList(block.Commands)));
}
protected override Expression VisitBlock(DbBlockCommand block)
{
return(MakeSequence(this.VisitExpressionList(block.Commands)));
}