/// <summary>
/// Count
/// </summary>
/// <param name="expression">表达式树</param>
/// <returns>SqlBuilderCore</returns>
public SqlBuilderCore <T> Count(Expression <Func <T, object> > expression = null)
{
this._sqlPack.Clear();
this._sqlPack.IsSingleTable = true;
if (expression == null)
{
this._sqlPack.Sql.Append($"SELECT COUNT(*) FROM {this._sqlPack.GetTableName(typeof(T))}");
}
else
{
SqlBuilderProvider.Count(expression.Body, this._sqlPack);
}
return(this);
}
/// <summary>
/// Count
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Count(UnaryExpression expression, SqlPack sqlPack)
{
SqlBuilderProvider.Count(expression.Operand, sqlPack);
return(sqlPack);
}
