c#数据类型-> oracle数据类型 [英] c# datatypes -> oracle datatypes

问题描述

我喜欢在Oracle数据库中保存不同的c#数据类型(int，十进制，双精度，字符串，Guid等).有人有一张表显示要使用的Oracle数据类型吗?

I like to save different c# data types in a Oracle database (int, decimal, double, string, Guid, …). Does anyone have a table showing what oracle data types to use?

我发现了一些表，这些表显示了用于不同oracle数据类型的c#数据类型，但没有相反的显示方式.

I have found tables showing what c# data types to use for different oracle data types but not the other way around.

推荐答案

我不确定是否有帮助，但这是使用.NET Reflector从ODP.NET程序集中获取的:

I'm not sure if this helps or not, but this was taken from the ODP.NET assembly using .NET Reflector:

internal static void InsertTableEntries()
{
    s_table.Add(typeof(byte), OracleDbType.Byte);
    s_table.Add(typeof(byte[]), OracleDbType.Raw);
    s_table.Add(typeof(char), OracleDbType.Varchar2);
    s_table.Add(typeof(char[]), OracleDbType.Varchar2);
    s_table.Add(typeof(DateTime), OracleDbType.TimeStamp);
    s_table.Add(typeof(short), OracleDbType.Int16);
    s_table.Add(typeof(int), OracleDbType.Int32);
    s_table.Add(typeof(long), OracleDbType.Int64);
    s_table.Add(typeof(float), OracleDbType.Single);
    s_table.Add(typeof(double), OracleDbType.Double);
    s_table.Add(typeof(decimal), OracleDbType.Decimal);
    s_table.Add(typeof(string), OracleDbType.Varchar2);
    s_table.Add(typeof(TimeSpan), OracleDbType.IntervalDS);
    s_table.Add(typeof(OracleBFile), OracleDbType.BFile);
    s_table.Add(typeof(OracleBinary), OracleDbType.Raw);
    s_table.Add(typeof(OracleBlob), OracleDbType.Blob);
    s_table.Add(typeof(OracleClob), OracleDbType.Clob);
    s_table.Add(typeof(OracleDate), OracleDbType.Date);
    s_table.Add(typeof(OracleDecimal), OracleDbType.Decimal);
    s_table.Add(typeof(OracleIntervalDS), OracleDbType.IntervalDS);
    s_table.Add(typeof(OracleIntervalYM), OracleDbType.IntervalYM);
    s_table.Add(typeof(OracleRefCursor), OracleDbType.RefCursor);
    s_table.Add(typeof(OracleString), OracleDbType.Varchar2);
    s_table.Add(typeof(OracleTimeStamp), OracleDbType.TimeStamp);
    s_table.Add(typeof(OracleTimeStampLTZ), OracleDbType.TimeStampLTZ);
    s_table.Add(typeof(OracleTimeStampTZ), OracleDbType.TimeStampTZ);
    s_table.Add(typeof(OracleXmlType), OracleDbType.XmlType);
    s_table.Add(typeof(OracleRef), OracleDbType.Ref);
}

在内部，ODP.NET似乎使用此(和一些其他映射)来确定数据类型.另外，要处理NUMBER数据类型:

Internally it looks like ODP.NET uses this (and a few other maps) to determine data types. Also, to handle the NUMBER data type:

internal static OracleDbType ConvertNumberToOraDbType(int precision, int scale)
{
    OracleDbType @decimal = OracleDbType.Decimal;
    if ((scale <= 0) && ((precision - scale) < 5))
    {
        return OracleDbType.Int16;
    }
    if ((scale <= 0) && ((precision - scale) < 10))
    {
        return OracleDbType.Int32;
    }
    if ((scale <= 0) && ((precision - scale) < 0x13))
    {
        return OracleDbType.Int64;
    }
    if ((precision < 8) && (((scale <= 0) && ((precision - scale) <= 0x26)) || ((scale > 0) && (scale <= 0x2c))))
    {
        return OracleDbType.Single;
    }
    if (precision < 0x10)
    {
        @decimal = OracleDbType.Double;
    }
    return @decimal;
}

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