在哪里可以找到 ODP 到 CLR 类型映射的列表？在 Oracle 数据库上，NUMBER(9,0) 类型在 .NET 应用程序中作为 MS Oracle 驱动程序中的 System.Decimal 出现，但作为 ODP 驱动程序中的 System.Int32 出现。我需要来自数据库的类型的精确规范（而不是 CLR 到 DB 参数映射）。
问问题
5595 次
2 回答
4
运行这个简单的测试以获取 SqlServer 和 Oracle（MS 和 ODP.NET 驱动程序）的映射：
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using Oracle.DataAccess.Client;
namespace DbOutTypeTest
{
public class Program
{
private static string SqlServerConnectionString = @"";
private static string OracleConnectionString = @"";
private static void WriteHeader(string title)
{
Console.WriteLine("----------------------------------------------------------");
Console.WriteLine("-- {0}", title);
Console.WriteLine("----------------------------------------------------------");
}
private static void WriteRow(string key, string value)
{
Console.WriteLine("{0}\t\t{1}", key.PadRight(30, ' '), value);
}
private static void EnumerateTypes(IDbConnection connection, string template, IEnumerable<string> types)
{
EnumerateTypes(connection, template, types, (arg1, arg2) => { });
}
private static void EnumerateTypes(IDbConnection connection, string template, IEnumerable<string> types, Action<string, string> action)
{
connection.Open();
using (var command = connection.CreateCommand())
{
foreach (var type in types)
{
var value = "";
command.CommandText = string.Format(template, type);
try
{
using (var reader = command.ExecuteReader())
{
if (reader.Read())
value = reader[0].GetType().FullName;
else
value = "<no data read>";
}
}
catch (Exception ex)
{
value = ex.Message;
}
WriteRow(type, value);
action(type, value);
}
}
}
private static IEnumerable<string> SqlServerIntegers()
{
yield return "tinyint";
yield return "smallint";
yield return "int";
yield return "bigint";
for (int precision = 1; precision <= 38; ++precision)
{
yield return "numeric(" + precision + ", 0)";
}
yield break;
}
private static IEnumerable<string> SqlServerFloatings()
{
yield return "real";
yield return "float";
for (int precision = 1; precision <= 38; ++precision)
{
for (int scale = 1; scale <= precision; ++scale)
yield return "numeric(" + precision + ", " + scale + ")";
}
yield break;
}
private static IEnumerable<string> OracleIntegers()
{
for (int precision = 1; precision <= 38; ++precision)
{
yield return "number(" + precision + ", 0)";
}
yield break;
}
private static IEnumerable<string> OracleFloatings()
{
for (int precision = 1; precision <= 38; ++precision)
{
for (int scale = 1; scale <= precision; ++scale)
yield return "number(" + precision + ", " + scale + ")";
}
yield break;
}
public static void Main(string[] args)
{
WriteHeader("C# types - CLR names");
Console.WriteLine("{0}\t\t{1}", "byte".PadRight(30, ' '), typeof(byte).FullName);
Console.WriteLine("{0}\t\t{1}", "short".PadRight(30, ' '), typeof(short).FullName);
Console.WriteLine("{0}\t\t{1}", "int".PadRight(30, ' '), typeof(int).FullName);
Console.WriteLine("{0}\t\t{1}", "long".PadRight(30, ' '), typeof(long).FullName);
Console.WriteLine("{0}\t\t{1}", "float".PadRight(30, ' '), typeof(float).FullName);
Console.WriteLine("{0}\t\t{1}", "double".PadRight(30, ' '), typeof(double).FullName);
var OracleToClrInteger = new Dictionary<string, string>();
var OracleToClrFloating = new Dictionary<string, string>();
var SqlServerToClrInteger = new Dictionary<string, string>();
var SqlServerToClrFloating = new Dictionary<string, string>();
WriteHeader("Oracle integers mapping (Oracle Data Provider)");
using (var connection = new OracleConnection(OracleConnectionString))
{
EnumerateTypes(connection, "SELECT CAST(0 AS {0}) FROM DUAL", OracleIntegers(), (type, value) => OracleToClrInteger.Add(type, value));
}
WriteHeader("SQLServer integers mapping");
using (var connection = new SqlConnection(SqlServerConnectionString))
{
EnumerateTypes(connection, "SELECT CAST(0 AS {0})", SqlServerIntegers(), (type, value) => SqlServerToClrInteger.Add(type, value));
}
WriteHeader("Oracle integers mapping (Microsoft Oracle Client)");
using (var connection = new System.Data.OracleClient.OracleConnection(OracleConnectionString))
{
EnumerateTypes(connection, "SELECT CAST(0 AS {0}) FROM DUAL", OracleIntegers());
}
WriteHeader("Oracle floats mapping (Oracle Data Provider)");
using (var connection = new OracleConnection(OracleConnectionString))
{
EnumerateTypes(connection, "SELECT CAST(0 AS {0}) FROM DUAL", OracleFloatings(), (type, value) => OracleToClrFloating.Add(type, value));
}
WriteHeader("SQLServer floats mapping");
using (var connection = new SqlConnection(SqlServerConnectionString))
{
EnumerateTypes(connection, "SELECT CAST(0 AS {0})", SqlServerFloatings(), (type, value) => SqlServerToClrFloating.Add(type, value));
}
WriteHeader("Oracle floats mapping (Microsoft Oracle Client)");
using (var connection = new System.Data.OracleClient.OracleConnection(OracleConnectionString))
{
EnumerateTypes(connection, "SELECT CAST(0 AS {0}) FROM DUAL", OracleFloatings());
}
WriteHeader("Suggested integer type mapping Oracle -> SqlServer");
foreach (var pair in OracleToClrInteger)
{
if (pair.Value == "System.Decimal")
WriteRow(pair.Key, pair.Key.Replace("number", "numeric"));
else
{
if (!SqlServerToClrInteger.Values.Contains(pair.Value))
WriteRow(pair.Key, "???");
else
WriteRow(pair.Key, SqlServerToClrInteger.First(p => p.Value == pair.Value).Key);
}
}
WriteHeader("Suggested floating type mapping Oracle -> SqlServer");
foreach (var pair in OracleToClrFloating)
{
if (pair.Value == "System.Decimal")
WriteRow(pair.Key, pair.Key.Replace("number", "numeric"));
else
{
if (!SqlServerToClrFloating.Values.Contains(pair.Value))
WriteRow(pair.Key, "???");
else
WriteRow(pair.Key, SqlServerToClrFloating.First(p => p.Value == pair.Value).Key);
}
}
}
}
}
最有趣的部分：
----------------------------------------------------------
-- Oracle integers mapping (Oracle Data Provider)
----------------------------------------------------------
number(1, 0) System.Int16
number(2, 0) System.Int16
number(3, 0) System.Int16
number(4, 0) System.Int16
number(5, 0) System.Int32
number(6, 0) System.Int32
number(7, 0) System.Int32
number(8, 0) System.Int32
number(9, 0) System.Int32
number(10, 0) System.Int64
number(11, 0) System.Int64
number(12, 0) System.Int64
number(13, 0) System.Int64
number(14, 0) System.Int64
number(15, 0) System.Int64
number(16, 0) System.Int64
number(17, 0) System.Int64
number(18, 0) System.Int64
number(19, 0) System.Decimal
number(20, 0) System.Decimal
number(21, 0) System.Decimal
number(22, 0) System.Decimal
number(23, 0) System.Decimal
number(24, 0) System.Decimal
于 2010-05-21T14:46:53.310 回答
3
Stefan，我自己也有同样的问题。
您可以在已安装的 DevArt DotConnect for Oracle 帮助文档中找到答案：ms-help://Devart.Data.Oracle/dcOracle/DataTypeMapping.html
您可能想在线浏览，在 DevArt 的网站上找到相同的信息： http: //www.devart.com/dotconnect/oracle/docs/DataTypeMapping.html
两者都在标题为“实体框架数据类型映射”的章节下。
“Oracle 到 .NET 类型映射 - 使用 Visual Studio 2008/2010 中的实体数据模型向导和实体开发人员中的数据库逆向工程向导从数据库生成模型时，使用此表中的类型映射规则......”
于 2010-05-18T14:40:59.767 回答