:指定参数


	复制代码 代码如下:

	

	public DataTable TodayToTable(int userId)

	{

	return userId > 0 ? V_CN_TASK_VALID_SCORING_TODAY.QueryTable(condition: " WHERE 承接者Id = " + userId) : null;

	}


其中的condition: " WHERE 承接者Id = " + userId就是指定参数 condition是QueryTable方法的参数


	复制代码 代码如下:

	

	/// <summary>

	/// 查询指定表的记录

	/// </summary>

	/// <param name="table">表名</param>

	/// <param name="fields">SELECT 子句的字段名列表</param>

	/// <param name="condition">查询条件</param>

	/// <param name="args">以半角逗号分隔的命令参数名称列表</param>

	/// <param name="vals">命令参数值数组(可选)</param>

	/// <returns>查询结果</returns>

	public static DataTable QueryTable(this string table, string fields = null, int? limit = null, string condition = null, string args = null, params object[] vals)

	{

	return GetTable(table.QueryDataSet(fields, limit, condition, args, vals), 0);

	}


??运算符


	复制代码 代码如下:

	

	var m_queryFields = fields.TrimNull() ?? "*";


等于


	复制代码 代码如下:

	

	var m_queryFields = fields.TrimNull() ? "*"：fields.TrimNull();