private static Expression GetUpdateExpressionByCalculator(LambdaExpression lambda, LambdaExpression predicate)
{
var initExp = lambda.Body as MemberInitExpression;
var newExp = initExp.NewExpression;
var entityType = newExp.Type;
var metadata = EntityMetadataUnity.GetEntityMetadata(entityType);
var table = new TableExpression(new TableAlias(), metadata.TableName, metadata.EntityType);
Expression where = null;
var row = GetTypeProjection(table, metadata, false);
if (predicate != null)
{
where = DbExpressionReplacer.Replace(predicate.Body, predicate.Parameters[0], row);
}
var list = new List <MemberAssignment>();
foreach (MemberAssignment ass in initExp.Bindings)
{
list.Add(Expression.Bind(ass.Member, DbExpressionReplacer.Replace(ass.Expression, lambda.Parameters[0], row)));
}
return(new UpdateCommandExpression(table, where, GetUpdateArguments(table, list)));
}
private static Expression GetUpdateExpressionByEntity(ConstantExpression constant, LambdaExpression predicate)
{
var entity = constant.Value as IEntity;
var metadata = EntityMetadataUnity.GetEntityMetadata(entity.EntityType);
var table = new TableExpression(new TableAlias(), metadata.TableName, metadata.EntityType);
Expression where = null;
if (predicate != null)
{
var row = GetTypeProjection(table, metadata, false);
where = DbExpressionReplacer.Replace(predicate.Body, predicate.Parameters[0], row);
}
return(new UpdateCommandExpression(table, where, GetUpdateArguments(table, entity)));
}
internal static Expression GetLogicalDeleteExpression(EntityMetadata metadata, LambdaExpression predicate)
{
var table = new TableExpression(new TableAlias(), metadata.TableName, metadata.EntityType);
Expression where = null;
var delflag = (ColumnExpression)GetMemberExpression(table, metadata.DeleteProperty);
var assignments = new List <ColumnAssignment>
{
new ColumnAssignment(delflag, Expression.Constant(true))
};
if (predicate != null)
{
var row = GetTypeProjection(table, metadata, false);
where = DbExpressionReplacer.Replace(predicate.Body, predicate.Parameters[0], row);
}
return(new UpdateCommandExpression(table, where, assignments));
}
internal static Expression GetDeleteExpression(EntityMetadata metadata, LambdaExpression predicate, bool replace)
{
var table = new TableExpression(new TableAlias(), metadata.TableName, metadata.EntityType);
Expression where = null;
if (predicate != null)
{
if (replace)
{
var row = GetTypeProjection(table, metadata, false);
where = DbExpressionReplacer.Replace(predicate.Body, predicate.Parameters[0], row);
}
else
{
where = predicate.Body;
}
}
return(new DeleteCommandExpression(table, where));
}
private static Expression GetUpdateExpressionByCalculator(TranslateContext transContext, LambdaExpression lambda, LambdaExpression predicate, bool isAsync)
{
var initExp = lambda.Body as MemberInitExpression;
var newExp = initExp.NewExpression;
var entityType = newExp.Type;
var metadata = EntityMetadataUnity.GetEntityMetadata(entityType);
var table = new TableExpression(new TableAlias(), metadata.TableName, metadata.EntityType);
Expression where = null;
var row = GetTypeProjection(transContext, table, metadata);
if (predicate != null)
{
where = DbExpressionReplacer.Replace(predicate.Body, predicate.Parameters[0], row);
}
var bindings = initExp.Bindings.Cast <MemberAssignment>().Select(m =>
Expression.Bind(m.Member, DbExpressionReplacer.Replace(m.Expression, lambda.Parameters[0], row)));
return(new UpdateCommandExpression(table, where, GetUpdateArguments(transContext, table, bindings), isAsync));
}
