/// <summary>
/// 访问参数列表
/// </summary>
/// <param name="expression">将访问的表达式</param>
/// <param name="isFilter">是否过滤条件</param>
internal void VisitArgument(Expression expression, bool isFilter = false)
{
ITranslateContext context = _builder.TranslateContext;
_tree.Select.Select = new DbExpression(DbExpressionType.Select, expression);
// 可能会有几级嵌套，这里用 Builder.Ident 标记是第几层级
string[] subs = new[] { "p", "u", "v", "w", "x" };
var newContext = context != null?TranslateContext.Copy(context, subs[_builder.Indent]) : null;
var cmd = Translator.Invoke(_tree.Select, _builder.Indent + 1, false, newContext) as DbSelectCommand;
_builder.Append('(');
_builder.Append(cmd.CommandText.Trim());
if (((DbSelectCommand)cmd).WhereFragment.Length > 0)
{
_builder.Append(" AND ");
}
else
{
_builder.Append("WHERE ");
}
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(_tree.Entity != null ? _tree.Entity.GetType() : _tree.Select.From);
foreach (var m in typeRuntime.KeyMembers)
{
_builder.AppendMember(string.Format("{0}0", subs[_builder.Indent]), m.Member, typeRuntime.Type);
_builder.Append(" = ");
_builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
_builder.Append('.');
_builder.AppendMember(null, m.Member, typeRuntime.Type);
_builder.Append(" AND ");
}
_builder.Length -= 5;
_builder.Append(')');
}
/// <summary>
/// 访问 IDbQueryable.Contains 方法
/// </summary>
/// <param name="m">方法表达式</param>
protected virtual Expression VisitQueryableContains(MethodCallExpression m)
{
ITranslateContext context = _builder.TranslateContext;
var subquery = m.Arguments[0].Evaluate().Value as DbQueryable;
subquery.Parameterized = _builder.Parameterized;
// 可能会有几级嵌套，这里用 Builder.Ident 标记是第几层级
string[] subs = new[] { "p", "u", "v", "w", "x" };
var newContext = context != null?TranslateContext.Copy(context, subs[_builder.Indent]) : null;
var cmd = subquery.Translate(_builder.Indent + 1, false, newContext) as DbSelectCommand;
if (this.NotOperands != null && this.NotOperands.Contains(m))
{
_builder.Append("NOT ");
}
_builder.Append("EXISTS(");
_builder.Append(cmd.CommandText);
if (cmd.WhereFragment.Length > 0)
{
_builder.Append(" AND ");
}
else
{
_builder.Append("WHERE ");
}
_builder.Append(cmd.SelectedColumnText);
_builder.Append(" = ");
_visitor.Visit(m.Arguments[1]);
_builder.Append(")");
return(m);
}