mcs/class/System.Data.Linq/src/DbLinq.Sqlite/SqliteVendor.cs

   1 #region MIT license\r
   2 // \r
   3 // MIT license\r
   4 //\r
   5 // Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne\r
   6 // \r
   7 // Permission is hereby granted, free of charge, to any person obtaining a copy\r
   8 // of this software and associated documentation files (the "Software"), to deal\r
   9 // in the Software without restriction, including without limitation the rights\r
  10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r
  11 // copies of the Software, and to permit persons to whom the Software is\r
  12 // furnished to do so, subject to the following conditions:\r
  13 // \r
  14 // The above copyright notice and this permission notice shall be included in\r
  15 // all copies or substantial portions of the Software.\r
  16 // \r
  17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
  18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r
  19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r
  20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r
  21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r
  22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\r
  23 // THE SOFTWARE.\r
  24 // \r
  25 #endregion\r
  26 using System;\r
  27 using System.Linq;\r
  28 using System.Collections.Generic;\r
  29 using System.Text;\r
  30 using System.Data;\r
  31 using System.Data.Linq.Mapping;\r
  32 using System.Reflection;\r
  33 #if MONO_STRICT\r
  34 using System.Data.Linq;\r
  35 using System.Data.Linq.SqlClient;\r
  36 #else\r
  37 using DbLinq.Data.Linq;\r
  38 using DbLinq.Data.Linq.SqlClient;\r
  39 #endif\r
  40 using DbLinq.Sqlite;\r
  41 using DbLinq.Util;\r
  42 using DbLinq.Vendor;\r
  43 \r
  44 namespace DbLinq.Sqlite\r
  45 {\r
  46     /// <summary>\r
  47     /// SQLite - specific code.\r
  48     /// </summary>\r
  49     [Vendor(typeof(SqliteProvider))]\r
  50 #if MONO_STRICT\r
  51     internal\r
  52 #else\r
  53     public\r
  54 #endif\r
  55  class SqliteVendor : Vendor.Implementation.Vendor\r
  56     {\r
  57         public override string VendorName { get { return "SQLite"; } }\r
  58 \r
  59         protected readonly SqliteSqlProvider sqlProvider = new SqliteSqlProvider();\r
  60         public override ISqlProvider SqlProvider { get { return sqlProvider; } }\r
  61 \r
  62         /// <summary>\r
  63         /// call SQLite stored proc or stored function, \r
  64         /// optionally return DataSet, and collect return params.\r
  65         /// </summary>\r
  66         public override System.Data.Linq.IExecuteResult ExecuteMethodCall(DataContext context, MethodInfo method\r
  67                                                                  , params object[] inputValues)\r
  68         {\r
  69             if (method == null)\r
  70                 throw new ArgumentNullException("L56 Null 'method' parameter");\r
  71 \r
  72             //check to make sure there is exactly one [FunctionEx]? that's below.\r
  73             //FunctionAttribute functionAttrib = GetFunctionAttribute(method);\r
  74             var functionAttrib = context.Mapping.GetFunction(method);\r
  75 \r
  76             ParameterInfo[] paramInfos = method.GetParameters();\r
  77             //int numRequiredParams = paramInfos.Count(p => p.IsIn || p.IsRetval);\r
  78             //if (numRequiredParams != inputValues.Length)\r
  79             //    throw new ArgumentException("L161 Argument count mismatch");\r
  80 \r
  81             string sp_name = functionAttrib.MappedName;\r
  82 \r
  83             using (IDbCommand command = context.Connection.CreateCommand())\r
  84             {\r
  85                 command.CommandText = sp_name;\r
  86                 //SQLiteCommand command = new SQLiteCommand("select hello0()");\r
  87                 int currInputIndex = 0;\r
  88 \r
  89                 List<string> paramNames = new List<string>();\r
  90                 for (int i = 0; i < paramInfos.Length; i++)\r
  91                 {\r
  92                     ParameterInfo paramInfo = paramInfos[i];\r
  93 \r
  94                     //TODO: check to make sure there is exactly one [Parameter]?\r
  95                     ParameterAttribute paramAttrib = paramInfo.GetCustomAttributes(false).OfType<ParameterAttribute>().Single();\r
  96 \r
  97                     string paramName = "?" + paramAttrib.Name; //eg. '?param1'\r
  98                     paramNames.Add(paramName);\r
  99 \r
 100                     System.Data.ParameterDirection direction = GetDirection(paramInfo, paramAttrib);\r
 101                     //SQLiteDbType dbType = SQLiteTypeConversions.ParseType(paramAttrib.DbType);\r
 102                     IDataParameter cmdParam = command.CreateParameter();\r
 103                     cmdParam.ParameterName = paramName;\r
 104                     //cmdParam.Direction = System.Data.ParameterDirection.Input;\r
 105                     if (direction == ParameterDirection.Input || direction == ParameterDirection.InputOutput)\r
 106                     {\r
 107                         object inputValue = inputValues[currInputIndex++];\r
 108                         cmdParam.Value = inputValue;\r
 109                     }\r
 110                     else\r
 111                     {\r
 112                         cmdParam.Value = null;\r
 113                     }\r
 114                     cmdParam.Direction = direction;\r
 115                     command.Parameters.Add(cmdParam);\r
 116                 }\r
 117 \r
 118                 if (!functionAttrib.IsComposable)\r
 119                 {\r
 120                     //procedures: under the hood, this seems to prepend 'CALL '\r
 121                     command.CommandType = System.Data.CommandType.StoredProcedure;\r
 122                 }\r
 123                 else\r
 124                 {\r
 125                     //functions: 'SELECT myFunction()' or 'SELECT hello(?s)'\r
 126                     string cmdText = "SELECT " + command.CommandText + "($args)";\r
 127                     cmdText = cmdText.Replace("$args", string.Join(",", paramNames.ToArray()));\r
 128                     command.CommandText = cmdText;\r
 129                 }\r
 130 \r
 131                 if (method.ReturnType == typeof(DataSet))\r
 132                 {\r
 133                     //unknown shape of resultset:\r
 134                     System.Data.DataSet dataSet = new DataSet();\r
 135                     IDbDataAdapter adapter = CreateDataAdapter(context);\r
 136                     adapter.SelectCommand = command;\r
 137                     adapter.Fill(dataSet);\r
 138                     List<object> outParamValues = CopyOutParams(paramInfos, command.Parameters);\r
 139                     return new ProcedureResult(dataSet, outParamValues.ToArray());\r
 140                 }\r
 141                 else\r
 142                 {\r
 143                     object obj = command.ExecuteScalar();\r
 144                     List<object> outParamValues = CopyOutParams(paramInfos, command.Parameters);\r
 145                     return new ProcedureResult(obj, outParamValues.ToArray());\r
 146                 }\r
 147             }\r
 148         }\r
 149 \r
 150         static System.Data.ParameterDirection GetDirection(ParameterInfo paramInfo, ParameterAttribute paramAttrib)\r
 151         {\r
 152             //strange hack to determine what's a ref, out parameter:\r
 153             //http://lists.ximian.com/pipermain/mono-list/2003-March/012751.html\r
 154             bool hasAmpersand = paramInfo.ParameterType.FullName.Contains('&');\r
 155             if (paramInfo.IsOut)\r
 156                 return System.Data.ParameterDirection.Output;\r
 157             if (hasAmpersand)\r
 158                 return System.Data.ParameterDirection.InputOutput;\r
 159             return System.Data.ParameterDirection.Input;\r
 160         }\r
 161 \r
 162         /// <summary>\r
 163         /// Collect all Out or InOut param values, casting them to the correct .net type.\r
 164         /// </summary>\r
 165         private List<object> CopyOutParams(ParameterInfo[] paramInfos, IDataParameterCollection paramSet)\r
 166         {\r
 167             List<object> outParamValues = new List<object>();\r
 168             //Type type_t = typeof(T);\r
 169             int i = -1;\r
 170             foreach (IDataParameter param in paramSet)\r
 171             {\r
 172                 i++;\r
 173                 if (param.Direction == System.Data.ParameterDirection.Input)\r
 174                 {\r
 175                     outParamValues.Add("unused");\r
 176                     continue;\r
 177                 }\r
 178 \r
 179                 object val = param.Value;\r
 180                 Type desired_type = paramInfos[i].ParameterType;\r
 181 \r
 182                 if (desired_type.Name.EndsWith("&"))\r
 183                 {\r
 184                     //for ref and out parameters, we need to tweak ref types, e.g.\r
 185                     // "System.Int32&, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"\r
 186                     string fullName1 = desired_type.AssemblyQualifiedName;\r
 187                     string fullName2 = fullName1.Replace("&", "");\r
 188                     desired_type = Type.GetType(fullName2);\r
 189                 }\r
 190                 try\r
 191                 {\r
 192                     //fi.SetValue(t, val); //fails with 'System.Decimal cannot be converted to Int32'\r
 193                     //DbLinq.util.FieldUtils.SetObjectIdField(t, fi, val);\r
 194                     //object val2 = DbLinq.Util.FieldUtils.CastValue(val, desired_type);\r
 195                     object val2 = TypeConvert.To(val, desired_type);\r
 196                     outParamValues.Add(val2);\r
 197                 }\r
 198                 catch (Exception)\r
 199                 {\r
 200                     //fails with 'System.Decimal cannot be converted to Int32'\r
 201                     //Logger.Write(Level.Error, "CopyOutParams ERROR L245: failed on CastValue(): " + ex.Message);\r
 202                 }\r
 203             }\r
 204             return outParamValues;\r
 205         }\r
 206     }\r
 207 }\r