#region License // Copyright (c) 2007 James Newton-King // // Permission is hereby granted, free of charge, to any person // obtaining a copy of this software and associated documentation // files (the "Software"), to deal in the Software without // restriction, including without limitation the rights to use, // copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following // conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR // OTHER DEALINGS IN THE SOFTWARE. #endregion using System; using System.Data.SqlTypes; namespace Newtonsoft.Utilities.Database { public static class SqlUtils { public static object ToValue(INullable nullableValue) { if (nullableValue == null) return null; else if (nullableValue is SqlInt32) return ToValue((SqlInt32)nullableValue); else if (nullableValue is SqlInt64) return ToValue((SqlInt64)nullableValue); else if (nullableValue is SqlBoolean) return ToValue((SqlBoolean)nullableValue); else if (nullableValue is SqlString) return ToValue((SqlString)nullableValue); else if (nullableValue is SqlDateTime) return ToValue((SqlDateTime)nullableValue); throw new Exception(string.Format("Unsupported INullable type: {0}", nullableValue.GetType())); } /// <summary> /// Determines whether the specified value is null. /// </summary> /// <param name="value">The value.</param> /// <returns> /// <c>true</c> if the specified value is null; otherwise, <c>false</c>. /// </returns> public static bool IsNull(object value) { if (value == null) return true; if (value is INullable && ((INullable)value).IsNull) return true; if (value == DBNull.Value) return true; return false; } /// <summary> /// Converts SqlType to .NET value. /// </summary> /// <param name="sqlValue">The SQL value.</param> /// <returns></returns> public static int? ToValue(SqlInt32 sqlValue) { if (IsNull(sqlValue)) return null; else return sqlValue.Value; } /// <summary> /// Converts SqlType to .NET value. /// </summary> /// <param name="sqlValue">The SQL value.</param> /// <returns></returns> public static long? ToValue(SqlInt64 sqlValue) { if (IsNull(sqlValue)) return null; else return sqlValue.Value; } /// <summary> /// Converts SqlType to .NET value. /// </summary> /// <param name="sqlValue">The SQL value.</param> /// <returns></returns> public static string ToValue(SqlString sqlValue) { if (IsNull(sqlValue)) return null; else return sqlValue.Value; } /// <summary> /// Converts SqlType to .NET value. /// </summary> /// <param name="sqlValue">The SQL value.</param> /// <returns></returns> public static DateTime? ToValue(SqlDateTime sqlValue) { if (IsNull(sqlValue)) return null; else return sqlValue.Value; } /// <summary> /// Converts SqlType to .NET value. /// </summary> /// <param name="sqlValue">The SQL value.</param> /// <returns></returns> public static bool? ToValue(SqlBoolean sqlValue) { if (IsNull(sqlValue)) return null; else return sqlValue.Value; } public static T? ToValue<T>(object value) where T : struct { if (IsNull(value)) return null; else return new T?((T)value); } public static SqlInt32 FromValue(int? nullableValue) { return (nullableValue != null) ? new SqlInt32(nullableValue.Value) : new SqlInt32(); } public static SqlDateTime FromValue(DateTime? nullableValue) { return (nullableValue != null) ? new SqlDateTime(nullableValue.Value) : new SqlDateTime(); } public static SqlBoolean FromValue(bool? nullableValue) { return (nullableValue != null) ? new SqlBoolean(nullableValue.Value) : new SqlBoolean(); } } }