/// <summary>
/// 创建分组集合的表达式。
/// </summary>
/// <param name="unit">分组的单元表达式。</param>
public DbGroupSetExpression(DbUnitTypeExpression unit)
: base(unit.ClrType, new DbGroupItemExpression(unit.Item))
{
Source = unit;
}
/// <summary>
/// 创建数据集连接操作。
/// </summary>
/// <param name="source">源数据单元表达式。</param>
/// <param name="target">目标数据单元表达式。</param>
/// <param name="kind">连接种类。</param>
public DbSetConnectExpression(DbUnitTypeExpression source, DbUnitTypeExpression target, EConnectKind kind)
: base(source.ClrType, source, new DbDataItemExpression(source.Item.ClrType))
{
Target = target;
Kind = kind;
}
/// <summary>
/// 创建分组并连接表达式。
/// </summary>
/// <param name="source">源表达式。</param>
/// <param name="target">目标表达式。</param>
/// <param name="left">左端键表达式。</param>
/// <param name="right">右端键表达式。</param>
/// <param name="newExp">当前连接后输出的新对象表达工。</param>
public DbGroupJoinExpression(DbUnitTypeExpression source, DbUnitTypeExpression target, DbExpression left, DbExpression right, DbUnitItemTypeExpression newExp)
: base(source, target, left, right, newExp)
{
}