protected virtual Expression VisitDeclaration(DbDeclarationCommand decl)
{
var variables = this.VisitVariableDeclarations(decl.Variables);
var source = this.Visit(decl.Source) as DbSelectExpression;
return(this.UpdateDeclaration(decl, variables, source));
}
protected override Expression VisitDeclaration(DbDeclarationCommand decl)
{
if (decl.Source != null)
{
var projection = new DbProjectionExpression
(
decl.Source,
Expression.NewArrayInit(typeof(object), decl.Variables.Select(v => v.Expression.Type.GetTypeInfo().IsValueType ? Expression.Convert(v.Expression, typeof(object)) : v.Expression).ToArray()),
DbAggregator.GetAggregator(typeof(object[]), typeof(IEnumerable <object[]>))
);
var vars = Expression.Parameter(typeof(object[]), "vars");
this.variables.Add(vars);
this.initializers.Add(Expression.Constant(null, typeof(object[])));
for (int i = 0, n = decl.Variables.Count; i < n; i++)
{
var v = decl.Variables[i];
var nv = new DbNamedValueExpression
(
v.Name, v.QueryType,
Expression.Convert(Expression.ArrayIndex(vars, Expression.Constant(i)), v.Expression.Type)
);
this.variableMap.Add(v.Name, nv);
}
return(MakeAssign(vars, this.Visit(projection)));
}
throw new InvalidOperationException("Declaration query not allowed for this langauge");
}
protected DbDeclarationCommand UpdateDeclaration(DbDeclarationCommand decl, IEnumerable <DbVariableDeclaration> variables, DbSelectExpression source)
{
if (variables != decl.Variables || source != decl.Source)
{
return(new DbDeclarationCommand(variables, source));
}
return(decl);
}
private DbCommandExpression GetDependentGeneratedVariableDeclaration(MappingEntity entity, MappingTable table, List <MemberInfo> members, Expression instance, Dictionary <MemberInfo, Expression> map)
{
var genIdCommand = null as DbDeclarationCommand;
var generatedIds = this.mapping.GetMappedMembers(entity).Where(m => this.mapping.IsPrimaryKey(entity, m) && this.mapping.IsGenerated(entity, m)).ToList();
if (generatedIds.Count > 0)
{
genIdCommand = this.GetGeneratedIdCommand(entity, members, map);
if (members.Count == generatedIds.Count)
{
return(genIdCommand);
}
}
members = members.Except(generatedIds).ToList();
var tableAlias = new TableAlias();
var tex = new DbTableExpression(tableAlias, entity, this.mapping.GetTableName(table));
var where = null as Expression;
if (generatedIds.Count > 0)
{
where = generatedIds.Select((m, i) => this.GetMemberExpression(tex, entity, m).Equal(map[m])).Aggregate((x, y) => x.And(y));
}
else
{
where = this.GetIdentityCheck(tex, entity, instance);
}
var selectAlias = new TableAlias();
var columns = new List <DbColumnDeclaration>();
var variables = new List <DbVariableDeclaration>();
foreach (var mi in members)
{
var col = (DbColumnExpression)this.GetMemberExpression(tex, entity, mi);
columns.Add(new DbColumnDeclaration(this.mapping.GetColumnName(entity, mi), col, col.QueryType));
var vcol = new DbColumnExpression(col.Type, col.QueryType, selectAlias, col.Name);
variables.Add(new DbVariableDeclaration(mi.Name, col.QueryType, vcol));
map.Add(mi, new DbVariableExpression(mi.Name, col.Type, col.QueryType));
}
var genMembersCommand = new DbDeclarationCommand(variables, new DbSelectExpression(selectAlias, columns, tex, where));
if (genIdCommand != null)
{
return(new DbBlockCommand(genIdCommand, genMembersCommand));
}
return(genMembersCommand);
}
protected override Expression VisitDeclaration(DbDeclarationCommand decl)
{
throw new NotSupportedException();
}
