Dapper ( http://code.google.com/p/dapper-dot-net/ ) で、モデル クラスのプロパティを無視する方法、つまりInsert拡張メソッドを使用する方法はありますか? 私のモデル クラスには、関連付けられたテーブルに永続化されていない一連の計算されたプロパティがあります。
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14891 次
6 に答える
7
DapperにはInsert拡張メソッドがありません。つまり、dapper.contrib、dapper拡張、またはdapperrainbowにあります。
Dapper自体で次のことができます。
Animal a = new Animal {Age = 10, Family = "Canine"}
// only insert Age
cnn.Execute("insert Animal(Age) values (@Age)", a);
一部の拡張クラスを回避するには、次のことを行うことができます。
cnn.InsertExtension("Animal", new{a.Age});
とにかく、複雑なフィルター処理されたインサートについては、いつでも生のDapperにフォールバックできます。
于 2012-06-10T09:50:16.080 に答える
4
Dapper.Contrib を使用している場合は、SqlMapperExtensions で次のコードを確認してください。
private static List<PropertyInfo> ComputedPropertiesCache(Type type)
{
//...
var computedProperties = TypePropertiesCache(type).Where(p => p.GetCustomAttributes(true).Any(a => a is ComputedAttribute)).ToList();
var computedProperties = ComputedPropertiesCache(type);
var allPropertiesExceptKeyAndComputed = allProperties.Except(keyProperties.Union(computedProperties)).ToList();
//...
for (var i = 0; i < allPropertiesExceptKeyAndComputed.Count; i++)
{
//...
したがってComputedAttribute、クラスのプロパティに a を追加すると、Dapper.Contrib はそれらをデータベースに挿入しようとしません! Dapper にこれらのプロパティを無視させることについて心配する必要はありません。Dapper.Contrib だけです。select * from tablenameダッパークエリで使用すると、存在する列のみをマップしようとするためです。したがって、としてマークしたプロパティの列を作成しないだけです[Computed]。
于 2016-09-14T16:40:59.847 に答える
0
SqlMapperExtensions クラスの修正版を作成し、列を除外するための string[] パラメータ ExcludeProperties を追加しました。このクラスを使用すると、次のような呼び出しを行うことができます。
// Insert
result = (int)cn.Insert<Animal>(box, new string[] { "Errors", "IsValid" });
// Update
cn.UpdateEntity<Animal>(box, new string[] { "Errors", "IsValid" });
上記のステートメントでは、追加した 'Errors' および 'IsValid' プロパティは SQL ステートメントに含まれません。
変更された拡張クラスは次のとおりです。
SqlMapperExtensions.cs
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Collections.Concurrent;
using System.Reflection.Emit;
using System.Threading;
using System.Runtime.CompilerServices;
namespace Dapper.Contrib.Extensions
{
public static class SqlMapperExtensions
{
public interface IProxy
{
bool IsDirty { get; set; }
}
private static readonly ConcurrentDictionary<RuntimeTypeHandle, IEnumerable<PropertyInfo>> KeyProperties = new ConcurrentDictionary<RuntimeTypeHandle, IEnumerable<PropertyInfo>>();
private static readonly ConcurrentDictionary<RuntimeTypeHandle, IEnumerable<PropertyInfo>> TypeProperties = new ConcurrentDictionary<RuntimeTypeHandle, IEnumerable<PropertyInfo>>();
private static readonly ConcurrentDictionary<RuntimeTypeHandle, string> GetQueries = new ConcurrentDictionary<RuntimeTypeHandle, string>();
private static readonly ConcurrentDictionary<RuntimeTypeHandle, string> TypeTableName = new ConcurrentDictionary<RuntimeTypeHandle, string>();
private static IEnumerable<PropertyInfo> KeyPropertiesCache(Type type)
{
if (KeyProperties.ContainsKey(type.TypeHandle))
{
return KeyProperties[type.TypeHandle];
}
var allProperties = TypePropertiesCache(type);
var keyProperties = allProperties.Where(p => p.GetCustomAttributes(true).Any(a => a is KeyAttribute)).ToList();
if (keyProperties.Count == 0)
{
var idProp = allProperties.Where(p => p.Name.ToLower() == "id" || p.Name.ToLower() == (type.Name.ToLower() + "id")).FirstOrDefault();
if (idProp != null)
{
keyProperties.Add(idProp);
}
}
KeyProperties[type.TypeHandle] = keyProperties;
return keyProperties;
}
private static IEnumerable<PropertyInfo> TypePropertiesCache(Type type)
{
if (TypeProperties.ContainsKey(type.TypeHandle))
{
return TypeProperties[type.TypeHandle];
}
var properties = type.GetProperties();
TypeProperties[type.TypeHandle] = properties;
return properties;
}
/// <summary>
/// Returns a single entity by a single id from table "Ts". T must be of interface type.
/// Id must be marked with [Key] attribute.
/// Created entity is tracked/intercepted for changes and used by the Update() extension.
/// </summary>
/// <typeparam name="T">Interface type to create and populate</typeparam>
/// <param name="connection">Open SqlConnection</param>
/// <param name="id">Id of the entity to get, must be marked with [Key] attribute</param>
/// <returns>Entity of T</returns>
public static T GetEntity<T>(this IDbConnection connection, dynamic id, IDbTransaction transaction = null, int? commandTimeout = null) where T : class
{
var type = typeof(T);
string sql;
if (!GetQueries.TryGetValue(type.TypeHandle, out sql))
{
var keys = KeyPropertiesCache(type);
if (keys.Count() > 1)
throw new DataException("Get<T> only supports an entity with a single [Key] property");
if (keys.Count() == 0)
throw new DataException("Get<T> only supports en entity with a [Key] property");
var onlyKey = keys.First();
var name = GetTableName(type);
// TODO: pluralizer
// TODO: query information schema and only select fields that are both in information schema and underlying class / interface
sql = "select * from " + name + " where " + onlyKey.Name + " = @id";
GetQueries[type.TypeHandle] = sql;
}
var dynParms = new DynamicParameters();
dynParms.Add("@id", id);
T obj = null;
if (type.IsInterface)
{
var res = connection.Query(sql, dynParms).FirstOrDefault() as IDictionary<string, object>;
if (res == null)
return (T)((object)null);
obj = ProxyGenerator.GetInterfaceProxy<T>();
foreach (var property in TypePropertiesCache(type))
{
var val = res[property.Name];
property.SetValue(obj, val, null);
}
((IProxy)obj).IsDirty = false; //reset change tracking and return
}
else
{
obj = connection.Query<T>(sql, dynParms, transaction: transaction, commandTimeout: commandTimeout).FirstOrDefault();
}
return obj;
}
private static string GetTableName(Type type)
{
string name;
if (!TypeTableName.TryGetValue(type.TypeHandle, out name))
{
//name = type.Name + "s";
name = type.Name;
if (type.IsInterface && name.StartsWith("I"))
name = name.Substring(1);
//NOTE: This as dynamic trick should be able to handle both our own Table-attribute as well as the one in EntityFramework
var tableattr = type.GetCustomAttributes(false).Where(attr => attr.GetType().Name == "TableAttribute").SingleOrDefault() as
dynamic;
if (tableattr != null)
name = tableattr.Name;
TypeTableName[type.TypeHandle] = name;
}
return name;
}
/// <summary>
/// Inserts an entity into table "Ts" and returns identity id.
/// </summary>
/// <param name="connection">Open SqlConnection</param>
/// <param name="entityToInsert">Entity to insert</param>
/// <returns>Identity of inserted entity</returns>
public static long Insert<T>(this IDbConnection connection, T entityToInsert, string[] ExcludeProperties = null, IDbTransaction transaction = null, int? commandTimeout = null) where T : class
{
//using (var tx = connection.BeginTransaction())
//{
var type = typeof(T);
var name = GetTableName(type);
var sb = new StringBuilder(null);
sb.AppendFormat("insert into {0} (", name);
var allProperties = TypePropertiesCache(type);
if (ExcludeProperties != null)
{
List<PropertyInfo> someProperties = allProperties.ToList();
foreach (PropertyInfo prop in allProperties.ToArray())
{
if (ExcludeProperties.Contains(prop.Name))
{
someProperties.Remove(prop);
}
}
allProperties = someProperties.AsEnumerable();
}
var keyProperties = KeyPropertiesCache(type);
for (var i = 0; i < allProperties.Count(); i++)
{
var property = allProperties.ElementAt(i);
if (keyProperties.Contains(property)) continue;
sb.Append(property.Name);
if (i < allProperties.Count() - 1)
sb.Append(", ");
}
sb.Append(") values (");
for (var i = 0; i < allProperties.Count(); i++)
{
var property = allProperties.ElementAt(i);
if (keyProperties.Contains(property)) continue;
sb.AppendFormat("@{0}", property.Name);
if (i < allProperties.Count() - 1)
sb.Append(", ");
}
sb.Append(") ");
connection.Execute(sb.ToString(), entityToInsert, transaction: transaction, commandTimeout: commandTimeout);
//NOTE: would prefer to use IDENT_CURRENT('tablename') or IDENT_SCOPE but these are not available on SQLCE
var r = connection.Query("select @@IDENTITY id");
//tx.Commit();
return (int)r.First().id;
//}
}
/// <summary>
/// Updates entity in table "Ts", checks if the entity is modified if the entity is tracked by the Get() extension.
/// </summary>
/// <typeparam name="T">Type to be updated</typeparam>
/// <param name="connection">Open SqlConnection</param>
/// <param name="entityToUpdate">Entity to be updated</param>
/// <returns>true if updated, false if not found or not modified (tracked entities)</returns>
public static bool UpdateEntity<T>(this IDbConnection connection, T entityToUpdate, string[] ExcludeProperties = null, IDbTransaction transaction = null, int? commandTimeout = null) where T : class
{
var proxy = entityToUpdate as IProxy;
if (proxy != null)
{
if (!proxy.IsDirty) return false;
}
var type = typeof(T);
var keyProperties = KeyPropertiesCache(type);
if (keyProperties.Count() == 0)
throw new ArgumentException("Entity must have at least one [Key] property");
var name = GetTableName(type);
var sb = new StringBuilder();
sb.AppendFormat("update {0} set ", name);
var allProperties = TypePropertiesCache(type);
if (ExcludeProperties != null)
{
List<PropertyInfo> someProperties = allProperties.ToList();
foreach (PropertyInfo prop in allProperties.ToArray())
{
if (ExcludeProperties.Contains(prop.Name))
{
someProperties.Remove(prop);
}
}
allProperties = someProperties.AsEnumerable();
}
var nonIdProps = allProperties.Where(a => !keyProperties.Contains(a));
for (var i = 0; i < nonIdProps.Count(); i++)
{
var property = nonIdProps.ElementAt(i);
sb.AppendFormat("{0} = @{1}", property.Name, property.Name);
if (i < nonIdProps.Count() - 1)
sb.AppendFormat(", ");
}
sb.Append(" where ");
for (var i = 0; i < keyProperties.Count(); i++)
{
var property = keyProperties.ElementAt(i);
sb.AppendFormat("{0} = @{1}", property.Name, property.Name);
if (i < keyProperties.Count() - 1)
sb.AppendFormat(" and ");
}
var updated = connection.Execute(sb.ToString(), entityToUpdate, commandTimeout: commandTimeout, transaction: transaction);
return updated > 0;
}
/// <summary>
/// Delete entity in table "Ts".
/// </summary>
/// <typeparam name="T">Type of entity</typeparam>
/// <param name="connection">Open SqlConnection</param>
/// <param name="entityToDelete">Entity to delete</param>
/// <returns>true if deleted, false if not found</returns>
public static bool Delete<T>(this IDbConnection connection, T entityToDelete, IDbTransaction transaction = null, int? commandTimeout = null) where T : class
{
var type = typeof(T);
var keyProperties = KeyPropertiesCache(type);
if (keyProperties.Count() == 0)
throw new ArgumentException("Entity must have at least one [Key] property");
var name = GetTableName(type);
var sb = new StringBuilder();
sb.AppendFormat("delete from {0} where ", name);
for (var i = 0; i < keyProperties.Count(); i++)
{
var property = keyProperties.ElementAt(i);
sb.AppendFormat("{0} = @{1}", property.Name, property.Name);
if (i < keyProperties.Count() - 1)
sb.AppendFormat(" and ");
}
var deleted = connection.Execute(sb.ToString(), entityToDelete, transaction: transaction, commandTimeout: commandTimeout);
return deleted > 0;
}
class ProxyGenerator
{
private static readonly Dictionary<Type, object> TypeCache = new Dictionary<Type, object>();
private static AssemblyBuilder GetAsmBuilder(string name)
{
var assemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(new AssemblyName { Name = name },
AssemblyBuilderAccess.Run); //NOTE: to save, use RunAndSave
return assemblyBuilder;
}
public static T GetClassProxy<T>()
{
// A class proxy could be implemented if all properties are virtual
// otherwise there is a pretty dangerous case where internal actions will not update dirty tracking
throw new NotImplementedException();
}
public static T GetInterfaceProxy<T>()
{
Type typeOfT = typeof(T);
if (TypeCache.ContainsKey(typeOfT))
{
return (T)TypeCache[typeOfT];
}
var assemblyBuilder = GetAsmBuilder(typeOfT.Name);
var moduleBuilder = assemblyBuilder.DefineDynamicModule("SqlMapperExtensions." + typeOfT.Name); //NOTE: to save, add "asdasd.dll" parameter
var interfaceType = typeof(Dapper.Contrib.Extensions.SqlMapperExtensions.IProxy);
var typeBuilder = moduleBuilder.DefineType(typeOfT.Name + "_" + Guid.NewGuid(),
TypeAttributes.Public | TypeAttributes.Class);
typeBuilder.AddInterfaceImplementation(typeOfT);
typeBuilder.AddInterfaceImplementation(interfaceType);
//create our _isDirty field, which implements IProxy
var setIsDirtyMethod = CreateIsDirtyProperty(typeBuilder);
// Generate a field for each property, which implements the T
foreach (var property in typeof(T).GetProperties())
{
var isId = property.GetCustomAttributes(true).Any(a => a is KeyAttribute);
CreateProperty<T>(typeBuilder, property.Name, property.PropertyType, setIsDirtyMethod, isId);
}
var generatedType = typeBuilder.CreateType();
//assemblyBuilder.Save(name + ".dll"); //NOTE: to save, uncomment
var generatedObject = Activator.CreateInstance(generatedType);
TypeCache.Add(typeOfT, generatedObject);
return (T)generatedObject;
}
private static MethodInfo CreateIsDirtyProperty(TypeBuilder typeBuilder)
{
var propType = typeof(bool);
var field = typeBuilder.DefineField("_" + "IsDirty", propType, FieldAttributes.Private);
var property = typeBuilder.DefineProperty("IsDirty",
System.Reflection.PropertyAttributes.None,
propType,
new Type[] { propType });
const MethodAttributes getSetAttr = MethodAttributes.Public | MethodAttributes.NewSlot | MethodAttributes.SpecialName |
MethodAttributes.Final | MethodAttributes.Virtual | MethodAttributes.HideBySig;
// Define the "get" and "set" accessor methods
var currGetPropMthdBldr = typeBuilder.DefineMethod("get_" + "IsDirty",
getSetAttr,
propType,
Type.EmptyTypes);
var currGetIL = currGetPropMthdBldr.GetILGenerator();
currGetIL.Emit(OpCodes.Ldarg_0);
currGetIL.Emit(OpCodes.Ldfld, field);
currGetIL.Emit(OpCodes.Ret);
var currSetPropMthdBldr = typeBuilder.DefineMethod("set_" + "IsDirty",
getSetAttr,
null,
new Type[] { propType });
var currSetIL = currSetPropMthdBldr.GetILGenerator();
currSetIL.Emit(OpCodes.Ldarg_0);
currSetIL.Emit(OpCodes.Ldarg_1);
currSetIL.Emit(OpCodes.Stfld, field);
currSetIL.Emit(OpCodes.Ret);
property.SetGetMethod(currGetPropMthdBldr);
property.SetSetMethod(currSetPropMthdBldr);
var getMethod = typeof(Dapper.Contrib.Extensions.SqlMapperExtensions.IProxy).GetMethod("get_" + "IsDirty");
var setMethod = typeof(Dapper.Contrib.Extensions.SqlMapperExtensions.IProxy).GetMethod("set_" + "IsDirty");
typeBuilder.DefineMethodOverride(currGetPropMthdBldr, getMethod);
typeBuilder.DefineMethodOverride(currSetPropMthdBldr, setMethod);
return currSetPropMthdBldr;
}
private static void CreateProperty<T>(TypeBuilder typeBuilder, string propertyName, Type propType, MethodInfo setIsDirtyMethod, bool isIdentity)
{
//Define the field and the property
var field = typeBuilder.DefineField("_" + propertyName, propType, FieldAttributes.Private);
var property = typeBuilder.DefineProperty(propertyName,
System.Reflection.PropertyAttributes.None,
propType,
new Type[] { propType });
const MethodAttributes getSetAttr = MethodAttributes.Public | MethodAttributes.Virtual |
MethodAttributes.HideBySig;
// Define the "get" and "set" accessor methods
var currGetPropMthdBldr = typeBuilder.DefineMethod("get_" + propertyName,
getSetAttr,
propType,
Type.EmptyTypes);
var currGetIL = currGetPropMthdBldr.GetILGenerator();
currGetIL.Emit(OpCodes.Ldarg_0);
currGetIL.Emit(OpCodes.Ldfld, field);
currGetIL.Emit(OpCodes.Ret);
var currSetPropMthdBldr = typeBuilder.DefineMethod("set_" + propertyName,
getSetAttr,
null,
new Type[] { propType });
//store value in private field and set the isdirty flag
var currSetIL = currSetPropMthdBldr.GetILGenerator();
currSetIL.Emit(OpCodes.Ldarg_0);
currSetIL.Emit(OpCodes.Ldarg_1);
currSetIL.Emit(OpCodes.Stfld, field);
currSetIL.Emit(OpCodes.Ldarg_0);
currSetIL.Emit(OpCodes.Ldc_I4_1);
currSetIL.Emit(OpCodes.Call, setIsDirtyMethod);
currSetIL.Emit(OpCodes.Ret);
//TODO: Should copy all attributes defined by the interface?
if (isIdentity)
{
var keyAttribute = typeof(KeyAttribute);
var myConstructorInfo = keyAttribute.GetConstructor(new Type[] { });
var attributeBuilder = new CustomAttributeBuilder(myConstructorInfo, new object[] { });
property.SetCustomAttribute(attributeBuilder);
}
property.SetGetMethod(currGetPropMthdBldr);
property.SetSetMethod(currSetPropMthdBldr);
var getMethod = typeof(T).GetMethod("get_" + propertyName);
var setMethod = typeof(T).GetMethod("set_" + propertyName);
typeBuilder.DefineMethodOverride(currGetPropMthdBldr, getMethod);
typeBuilder.DefineMethodOverride(currSetPropMthdBldr, setMethod);
}
}
}
[AttributeUsage(AttributeTargets.Class)]
public class TableAttribute : Attribute
{
public TableAttribute(string tableName)
{
Name = tableName;
}
public string Name { get; private set; }
}
}
于 2013-07-10T14:30:23.463 に答える
0
Dapper の拡張である軽量の ORM を作成しました。それは実際にあなたが必要とすることをします。プロパティの「メンバー」属性を省略した場合、ORM はそれを挿入から除外します。
于 2016-02-25T17:52:57.377 に答える