/// <summary>
/// 填充值的括号
/// </summary>
/// <param name="left">连接符左边</param>
/// <param name="isLeft">是否在运算符左边</param>
/// <param name="operLevel">当前符号优先级</param>
/// <param name="info">输出信息</param>
/// <returns></returns>
public static string FillBreak(BQLValueItem value, bool isLeft, int operLevel, KeyWordInfomation info)
{
IOperatorPriorityLevel pl = value as IOperatorPriorityLevel;
if (pl == null)
{
return(value.DisplayValue(info));
}
if ((!info.DBInfo.OperatorPrecedence) || (isLeft && pl.PriorityLevel < operLevel) ||
((!isLeft) && pl.PriorityLevel <= operLevel)
)
{
return("(" + value.DisplayValue(info) + ")");
}
return(value.DisplayValue(info));
}
/// <summary>
/// 进行除法运算
/// </summary>
/// <param name="handle"></param>
/// <returns></returns>
internal static string DoMod(BQLOperatorHandle handle, KeyWordInfomation info)
{
BQLValueItem[] parameters = handle.GetParameters();
BQLValueItem item1 = parameters[0];
BQLValueItem item2 = parameters[1];
string value1 = item1.DisplayValue(info);
string value2 = item2.DisplayValue(info);
return(info.DBInfo.Math.DoMod(new string[] { value1, value2 }));
}
internal override string DisplayValue(KeyWordInfomation info)
{
KeyWordConver objCover = new KeyWordConver();
StringBuilder sb = new StringBuilder();
sb.Append("(");
sb.Append(caseItem.DisplayValue(info));
sb.Append(" end) ");
return(sb.ToString());
}
/// <summary>
/// 不等于
/// </summary>
/// <param name="handle"></param>
/// <returns></returns>
internal static string DoNotequal(BQLComparItem handle, KeyWordInfomation info)
{
IList <BQLValueItem> parameters = handle.GetParameters();
if (parameters[1].IsNullValue())
{
BQLValueItem item = parameters[0];
return(item.DisplayValue(info) + " is not null");
}
return(ConditionsFunction(handle, "<>", info));
}
internal override string DisplayValue(KeyWordInfomation info)
{
IDBAdapter idba = info.DBInfo.CurrentDbAdapter;
bool isWhere = info.IsWhere;
info.IsWhere = true;
string ret = _prmHandle.DisplayValue(info);
if (!string.IsNullOrEmpty(_aliasName))
{
ret += " as " + idba.FormatParam(_aliasName);
}
info.IsWhere = isWhere;
return(ret);
}
/// <summary>
/// 进行加法运算
/// </summary>
/// <param name="handle"></param>
/// <returns></returns>
internal static string DoAdd(BQLOperatorHandle fHandle, KeyWordInfomation info)
{
BQLValueItem[] parameters = fHandle.GetParameters();
BQLValueItem item1 = parameters[0];
BQLValueItem item2 = parameters[1];
if (IsStringDBType(item1.ValueDbType) || IsStringDBType(item2.ValueDbType)) //字符串拼合
{
string value1 = item1.DisplayValue(info);
string value2 = item2.DisplayValue(info);
//if(OperatorPrecedenceUnit.LeftNeedBreak(
fHandle.ValueDbType = DbType.String;
return(info.DBInfo.CurrentDbAdapter.ConcatString(value1, value2));
}
else
{
fHandle.ValueDbType = DbType.Double;
}
return(CustomerConnectFunction(fHandle.GetParameters(), "+", info, fHandle.PriorityLevel));
}