/// <summary>
/// 设置 SELECT 语句的 FROM 子句（适用于多表查询）。
/// </summary>
/// <param name="content">FROM段的内容。</param>
/// <returns></returns>
public SelectBlock From(params IDescription[] content)
{
FromBlock fb = new FromBlock();
fb.Content.AddRange(content);
Blocks.Add(fb);
return(this);
}
/// <summary>
/// 设置 SELECT 语句的 FROM 子句（适用于单表查询）。
/// </summary>
/// <param name="tableName">要查询的表名称。</param>
/// <returns></returns>
public SelectBlock From(string tableName)
{
FromBlock fb = new FromBlock();
fb.Content.Add(fm.Table(tableName));
Blocks.Add(fb);
return(this);
}
