5 // Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
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7 // Permission is hereby granted, free of charge, to any person obtaining a copy
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8 // of this software and associated documentation files (the "Software"), to deal
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9 // in the Software without restriction, including without limitation the rights
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10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 // copies of the Software, and to permit persons to whom the Software is
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12 // furnished to do so, subject to the following conditions:
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14 // The above copyright notice and this permission notice shall be included in
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15 // all copies or substantial portions of the Software.
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17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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28 using System.Data.Common;
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30 using System.Data.Linq.Mapping;
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31 using System.Reflection;
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32 using System.Collections.Generic;
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34 using System.Data.Linq.SqlClient;
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36 using DbLinq.Data.Linq.SqlClient;
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38 using DbLinq.PostgreSql;
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40 using DbLinq.Vendor;
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42 using DataContext=System.Data.Linq.DataContext;
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44 using DataContext=DbLinq.Data.Linq.DataContext;
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47 namespace DbLinq.PostgreSql
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50 /// PostgreSQL - specific code.
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52 [Vendor(typeof(PostgreSqlProvider))]
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58 class PgsqlVendor : Vendor.Implementation.Vendor
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60 public override string VendorName { get { return "PostgreSQL"; } }
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62 protected readonly PgsqlSqlProvider sqlProvider = new PgsqlSqlProvider();
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63 public override ISqlProvider SqlProvider { get { return sqlProvider; } }
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65 protected void SetParameterType(IDbDataParameter parameter, PropertyInfo property, string literal)
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67 object dbType = Enum.Parse(property.PropertyType, literal);
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68 property.GetSetMethod().Invoke(parameter, new object[] { dbType });
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71 protected void SetParameterType(IDbDataParameter parameter, string literal)
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73 SetParameterType(parameter, parameter.GetType().GetProperty("NpgsqlDbType"), literal);
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77 public override IDbDataParameter CreateSqlParameter(IDbCommand cmd, string dbTypeName, string paramName)
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79 //System.Data.SqlDbType dbType = DbLinq.util.SqlTypeConversions.ParseType(dbTypeName);
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80 //SqlParameter param = new SqlParameter(paramName, dbType);
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81 NpgsqlTypes.NpgsqlDbType dbType = PgsqlTypeConversions.ParseType(dbTypeName);
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82 NpgsqlParameter param = new NpgsqlParameter(paramName, dbType);
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87 /// call mysql stored proc or stored function,
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88 /// optionally return DataSet, and collect return params.
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90 public override System.Data.Linq.IExecuteResult ExecuteMethodCall(DataContext context, MethodInfo method
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91 , params object[] inputValues)
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94 throw new ArgumentNullException("L56 Null 'method' parameter");
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96 //check to make sure there is exactly one [FunctionEx]? that's below.
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97 //FunctionAttribute functionAttrib = GetFunctionAttribute(method);
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98 var functionAttrib = context.Mapping.GetFunction(method);
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100 ParameterInfo[] paramInfos = method.GetParameters();
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101 //int numRequiredParams = paramInfos.Count(p => p.IsIn || p.IsRetval);
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102 //if (numRequiredParams != inputValues.Length)
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103 // throw new ArgumentException("L161 Argument count mismatch");
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105 string sp_name = functionAttrib.MappedName;
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107 using (IDbCommand command = context.Connection.CreateCommand())
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109 command.CommandText = sp_name;
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110 //MySqlCommand command = new MySqlCommand("select hello0()");
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111 int currInputIndex = 0;
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113 List<string> paramNames = new List<string>();
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114 for (int i = 0; i < paramInfos.Length; i++)
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116 ParameterInfo paramInfo = paramInfos[i];
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118 //TODO: check to make sure there is exactly one [Parameter]?
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119 ParameterAttribute paramAttrib = paramInfo.GetCustomAttributes(false).OfType<ParameterAttribute>().Single();
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121 //string paramName = "?" + paramAttrib.Name; //eg. '?param1' MYSQL
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122 string paramName = ":" + paramAttrib.Name; //eg. '?param1' PostgreSQL
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123 paramNames.Add(paramName);
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125 System.Data.ParameterDirection direction = GetDirection(paramInfo, paramAttrib);
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126 //MySqlDbType dbType = MySqlTypeConversions.ParseType(paramAttrib.DbType);
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127 IDbDataParameter cmdParam = command.CreateParameter();
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128 cmdParam.ParameterName = paramName;
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129 //cmdParam.Direction = System.Data.ParameterDirection.Input;
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130 if (direction == ParameterDirection.Input || direction == ParameterDirection.InputOutput)
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132 object inputValue = inputValues[currInputIndex++];
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133 cmdParam.Value = inputValue;
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137 cmdParam.Value = null;
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139 cmdParam.Direction = direction;
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140 command.Parameters.Add(cmdParam);
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143 if (!functionAttrib.IsComposable)
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145 //procedures: under the hood, this seems to prepend 'CALL '
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146 command.CommandType = System.Data.CommandType.StoredProcedure;
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150 //functions: 'SELECT myFunction()' or 'SELECT hello(?s)'
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151 string cmdText = "SELECT " + command.CommandText + "($args)";
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152 cmdText = cmdText.Replace("$args", string.Join(",", paramNames.ToArray()));
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153 command.CommandText = cmdText;
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156 if (method.ReturnType == typeof(DataSet))
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158 //unknown shape of resultset:
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159 System.Data.DataSet dataSet = new DataSet();
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160 IDbDataAdapter adapter = CreateDataAdapter(context);
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161 adapter.SelectCommand = command;
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162 adapter.Fill(dataSet);
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163 List<object> outParamValues = CopyOutParams(paramInfos, command.Parameters);
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164 return new ProcedureResult(dataSet, outParamValues.ToArray());
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168 object obj = command.ExecuteScalar();
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169 List<object> outParamValues = CopyOutParams(paramInfos, command.Parameters);
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170 return new ProcedureResult(obj, outParamValues.ToArray());
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175 static ParameterDirection GetDirection(ParameterInfo paramInfo, ParameterAttribute paramAttrib)
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177 //strange hack to determine what's a ref, out parameter:
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178 //http://lists.ximian.com/pipermain/mono-list/2003-March/012751.html
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179 bool hasAmpersand = paramInfo.ParameterType.FullName.Contains('&');
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180 if (paramInfo.IsOut)
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181 return ParameterDirection.Output;
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183 return ParameterDirection.InputOutput;
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184 return ParameterDirection.Input;
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188 /// Collect all Out or InOut param values, casting them to the correct .net type.
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190 private List<object> CopyOutParams(ParameterInfo[] paramInfos, IDataParameterCollection paramSet)
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192 List<object> outParamValues = new List<object>();
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193 //Type type_t = typeof(T);
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195 foreach (IDbDataParameter param in paramSet)
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198 if (param.Direction == ParameterDirection.Input)
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200 outParamValues.Add("unused");
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204 object val = param.Value;
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205 Type desired_type = paramInfos[i].ParameterType;
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207 if (desired_type.Name.EndsWith("&"))
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209 //for ref and out parameters, we need to tweak ref types, e.g.
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210 // "System.Int32&, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
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211 string fullName1 = desired_type.AssemblyQualifiedName;
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212 string fullName2 = fullName1.Replace("&", "");
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213 desired_type = Type.GetType(fullName2);
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217 //fi.SetValue(t, val); //fails with 'System.Decimal cannot be converted to Int32'
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218 //DbLinq.util.FieldUtils.SetObjectIdField(t, fi, val);
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219 //object val2 = DbLinq.Util.FieldUtils.CastValue(val, desired_type);
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220 object val2 = TypeConvert.To(val, desired_type);
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221 outParamValues.Add(val2);
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225 //fails with 'System.Decimal cannot be converted to Int32'
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226 //Logger.Write(Level.Error, "CopyOutParams ERROR L245: failed on CastValue(): " + ex.Message);
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229 return outParamValues;
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