static void BuildTake(ExpressionBuilder builder, IBuildContext sequence, ISqlExpression expr)
{
var sql = sequence.SelectQuery;
sql.Select.Take(expr);
if (sql.Select.SkipValue != null &&
builder.DataContextInfo.SqlProviderFlags.IsTakeSupported &&
!builder.DataContextInfo.SqlProviderFlags.GetIsSkipSupportedFlag(sql))
{
if (sql.Select.SkipValue is SqlParameter && sql.Select.TakeValue is SqlValue)
{
var skip = (SqlParameter)sql.Select.SkipValue;
var parm = (SqlParameter)sql.Select.SkipValue.Clone(new Dictionary <ICloneableElement, ICloneableElement>(), _ => true);
parm.SetTakeConverter((int)((SqlValue)sql.Select.TakeValue).Value);
sql.Select.Take(parm);
var ep = (from pm in builder.CurrentSqlParameters where pm.SqlParameter == skip select pm).First();
ep = new ParameterAccessor
{
Expression = ep.Expression,
Accessor = ep.Accessor,
SqlParameter = parm
};
builder.CurrentSqlParameters.Add(ep);
}
else
{
sql.Select.Take(builder.Convert(
sequence,
new SqlBinaryExpression(typeof(int), sql.Select.SkipValue, "+", sql.Select.TakeValue, Precedence.Additive)));
}
}
if (!builder.DataContextInfo.SqlProviderFlags.GetAcceptsTakeAsParameterFlag(sql))
{
var p = sql.Select.TakeValue as SqlParameter;
if (p != null)
{
p.IsQueryParameter = false;
}
}
}
static void BuildSubQueryJoin(
ExpressionBuilder builder,
IBuildContext outerKeyContext, Expression outerKeySelector,
Expression innerKeySelector,
IBuildContext subQueryKeyContext, SelectQuery subQuerySelect)
{
var predicate = builder.ConvertObjectComparison(
ExpressionType.Equal,
outerKeyContext, outerKeySelector,
subQueryKeyContext, innerKeySelector);
if (predicate == null)
{
predicate = new SelectQuery.Predicate.ExprExpr(
builder.ConvertToSql(outerKeyContext, outerKeySelector),
SelectQuery.Predicate.Operator.Equal,
builder.ConvertToSql(subQueryKeyContext, innerKeySelector));
predicate = builder.Convert(outerKeyContext, predicate);
}
subQuerySelect.Where.SearchCondition.Conditions.Add(new SelectQuery.Condition(false, predicate));
}
static void BuildJoin(
ExpressionBuilder builder,
SelectQuery.FromClause.Join join,
IBuildContext outerKeyContext, Expression outerKeySelector,
IBuildContext innerKeyContext, Expression innerKeySelector)
{
var predicate = builder.ConvertObjectComparison(
ExpressionType.Equal,
outerKeyContext, outerKeySelector,
innerKeyContext, innerKeySelector);
if (predicate == null)
{
predicate = new SelectQuery.Predicate.ExprExpr(
builder.ConvertToSql(outerKeyContext, outerKeySelector),
SelectQuery.Predicate.Operator.Equal,
builder.ConvertToSql(innerKeyContext, innerKeySelector));
predicate = builder.Convert(outerKeyContext, predicate);
}
join.JoinedTable.Condition.Conditions.Add(new SelectQuery.Condition(false, predicate));
}
