/// <summary>
/// 获取SQLDOM元素类型
/// </summary>
/// <param name="sqlElement">SQLDOM元素</param>
/// <returns>SQLDOM元素类型</returns>
public static int GetSqlElementType(SqlElement sqlElement)
{
SqlElementType elementType = SqlElementType.UnKnown;
var type = sqlElement.GetType();
if (type == typeof(InsertField))
{
elementType = SqlElementType.InsertField;
}
if (type == typeof(SqlPrimaryKeyField))
{
elementType = SqlElementType.SqlPrimaryKeyField;
}
if (type == typeof(SelectListField))
{
elementType = SqlElementType.SelectListField;
}
if (type == typeof(UpdateField))
{
elementType = SqlElementType.UpdateField;
}
return((int)elementType);
}
/// <summary>
/// 根据SQLDOM元素类型初始化SQLDOM元素对象
/// </summary>
/// <param name="sqlElementType">SQLDOM元素类型</param>
/// <returns>SQLDOM元素对象</returns>
public static SqlElement GetSQLElement(int sqlElementType)
{
SqlElement element = null;
SqlElementType type = (SqlElementType)sqlElementType;
switch (type)
{
case SqlElementType.InsertField:
element = new InsertField();
break;
case SqlElementType.SqlPrimaryKeyField:
element = new SqlPrimaryKeyField();
break;
case SqlElementType.SelectListField:
element = new SelectListField();
break;
case SqlElementType.UpdateField:
element = new UpdateField();
break;
case SqlElementType.From:
element = new From();
break;
case SqlElementType.FromItem:
element = new FromItem();
break;
case SqlElementType.JoinCondition:
element = new JoinConditionStatement();
break;
case SqlElementType.OrderByCondition:
element = new ConditionStatement();
break;
case SqlElementType.FilterCondition:
element = new ConditionStatement();
break;
case SqlElementType.UnKnown:
break;
}
return(element);
}
