static void BuildTake(ExpressionBuilder builder, IBuildContext sequence, ISqlExpression expr)
{
var sql = sequence.SqlQuery;
builder.SqlProvider.SqlQuery = sql;
sql.Select.Take(expr);
if (sql.Select.SkipValue != null && builder.SqlProvider.IsTakeSupported && !builder.SqlProvider.IsSkipSupported)
{
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.SqlProvider.TakeAcceptsParameter)
{
var p = sql.Select.TakeValue as SqlParameter;
if (p != null)
{
p.IsQueryParameter = false;
}
}
}
static void BuildTake(ExpressionBuilder builder, IBuildContext sequence, ISqlExpression expr)
{
var sql = sequence.SqlQuery;
builder.SqlProvider.SqlQuery = sql;
sql.Select.Take(expr);
if (sql.Select.SkipValue != null && builder.SqlProvider.IsTakeSupported && !builder.SqlProvider.IsSkipSupported)
{
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.SqlProvider.TakeAcceptsParameter)
{
var p = sql.Select.TakeValue as SqlParameter;
if (p != null)
p.IsQueryParameter = false;
}
}
static void BuildSkip(ExpressionBuilder builder, IBuildContext sequence, ISqlExpression prevSkipValue, ISqlExpression expr)
{
var sql = sequence.SqlQuery;
builder.SqlProvider.SqlQuery = sql;
sql.Select.Skip(expr);
builder.SqlProvider.SqlQuery = sql;
if (sql.Select.TakeValue != null)
{
if (builder.SqlProvider.IsSkipSupported || !builder.SqlProvider.IsTakeSupported)
sql.Select.Take(builder.Convert(
sequence,
new SqlBinaryExpression(typeof(int), sql.Select.TakeValue, "-", sql.Select.SkipValue, Precedence.Additive)));
if (prevSkipValue != null)
sql.Select.Skip(builder.Convert(
sequence,
new SqlBinaryExpression(typeof(int), prevSkipValue, "+", sql.Select.SkipValue, Precedence.Additive)));
}
if (!builder.SqlProvider.TakeAcceptsParameter)
{
var p = sql.Select.SkipValue as SqlParameter;
if (p != null)
p.IsQueryParameter = false;
}
}
