我对使用Dapper很感兴趣，但据我所知，它只支持查询和执行。我没有看到Dapper包含插入和更新对象的方法。
假设我们的项目(大多数项目?)需要进行插入和更新，那么与dapper一起进行插入和更新的最佳实践是什么?
我们最好不要诉诸于ADO。NET参数构建方法等。
在这一点上，我能想到的最佳答案是使用LinqToSQL进行插入和更新。还有更好的答案吗?
当前回答
你可以试试这个:
string sql = "UPDATE Customer SET City = @City WHERE CustomerId = @CustomerId";
conn.Execute(sql, customerEntity);
其他回答
使用Dapper执行CRUD操作是一项简单的任务。我已经提到了下面的示例，它们应该可以帮助您进行CRUD操作。
CRUD代码:
方法#1:当您插入来自不同实体的值时使用此方法。
using (IDbConnection db = new SqlConnection(ConfigurationManager.ConnectionStrings["myDbConnection"].ConnectionString))
{
string insertQuery = @"INSERT INTO [dbo].[Customer]([FirstName], [LastName], [State], [City], [IsActive], [CreatedOn]) VALUES (@FirstName, @LastName, @State, @City, @IsActive, @CreatedOn)";
var result = db.Execute(insertQuery, new
{
customerModel.FirstName,
customerModel.LastName,
StateModel.State,
CityModel.City,
isActive,
CreatedOn = DateTime.Now
});
}
方法#2:当您的实体属性与SQL列具有相同的名称时使用此方法。因此，Dapper作为ORM将实体属性与匹配的SQL列映射。
using (IDbConnection db = new SqlConnection(ConfigurationManager.ConnectionStrings["myDbConnection"].ConnectionString))
{
string insertQuery = @"INSERT INTO [dbo].[Customer]([FirstName], [LastName], [State], [City], [IsActive], [CreatedOn]) VALUES (@FirstName, @LastName, @State, @City, @IsActive, @CreatedOn)";
var result = db.Execute(insertQuery, customerViewModel);
}
CRUD代码:
using (IDbConnection db = new SqlConnection(ConfigurationManager.ConnectionStrings["myDbConnection"].ConnectionString))
{
string selectQuery = @"SELECT * FROM [dbo].[Customer] WHERE FirstName = @FirstName";
var result = db.Query(selectQuery, new
{
customerModel.FirstName
});
}
CRUD代码:
using (IDbConnection db = new SqlConnection(ConfigurationManager.ConnectionStrings["myDbConnection"].ConnectionString))
{
string updateQuery = @"UPDATE [dbo].[Customer] SET IsActive = @IsActive WHERE FirstName = @FirstName AND LastName = @LastName";
var result = db.Execute(updateQuery, new
{
isActive,
customerModel.FirstName,
customerModel.LastName
});
}
CRUD代码:
using (IDbConnection db = new SqlConnection(ConfigurationManager.ConnectionStrings["myDbConnection"].ConnectionString))
{
string deleteQuery = @"DELETE FROM [dbo].[Customer] WHERE FirstName = @FirstName AND LastName = @LastName";
var result = db.Execute(deleteQuery, new
{
customerModel.FirstName,
customerModel.LastName
});
}
你可以这样做:
sqlConnection.Open();
string sqlQuery = "INSERT INTO [dbo].[Customer]([FirstName],[LastName],[Address],[City]) VALUES (@FirstName,@LastName,@Address,@City)";
sqlConnection.Execute(sqlQuery,
new
{
customerEntity.FirstName,
customerEntity.LastName,
customerEntity.Address,
customerEntity.City
});
Caius补充的编辑:
注意，没有必要以这种“操作之前/之后立即”的方式打开/关闭连接:如果您的连接关闭了，Dapper会打开它。如果你的连接是开放的，Dapper会让它保持开放。
如果你有很多操作要执行/你正在使用一个事务，你可以自己打开连接。如果你要做的只是打开/执行/关闭，就让Dapper来做。
而且，没有必要创建匿名类型;只要使参数名称与保存数据的任何类型的属性名称相匹配，并传递该类型而不是将其解压缩为匿名类型。
上面的代码可以这样写:
string sqlQuery = "INSERT INTO [dbo].[Customer]([FirstName],[LastName],[Address],[City]) VALUES (@FirstName,@LastName,@Address,@City)";
using(var sqlConnection = ...){
sqlConnection.Execute(sqlQuery, customerEntity);
}
使用短小精悍的。它是如此简单:
插入列表:
public int Insert(IEnumerable<YourClass> yourClass)
{
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
return conn.Insert(yourClass) ;
}
}
插入单:
public int Insert(YourClass yourClass)
{
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
return conn.Insert(yourClass) ;
}
}
更新列表:
public bool Update(IEnumerable<YourClass> yourClass)
{
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
return conn.Update(yourClass) ;
}
}
更新单:
public bool Update(YourClass yourClass)
{
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
return conn.Update(yourClass) ;
}
}
来源:https://github.com/StackExchange/Dapper/tree/master/Dapper.Contrib
存储过程+ Dapper方法或SQL插入语句+ Dapper方法可以工作，但它不能完美地实现ORM的概念，即动态映射数据模型与SQL表列，因为如果使用上述两种方法之一，您仍然需要在存储过程参数或SQL插入语句中硬编码一些列名值。
为了解决最小化代码修改的问题，您可以使用Dapper。为了支持SQL插入，这里是官方指南，下面是示例设置和代码
步骤1
使用Dapper.Contrib.Extensions在c#中创建类模型: [Table]属性将指向SQL框中所需的表名，[ExplicitKey]属性将告诉Dapper此模型属性是SQL表中的主键。
[Table("MySQLTableName")]
public class UserModel
{
[ExplicitKey]
public string UserId { get; set; }
public string Name { get; set; }
public string Sex { get; set; }
}
步骤2
像这样设置SQL数据库/表:
步骤3
现在像下面这样构建你的c#代码，你需要使用这些命名空间:
using Dapper.Contrib.Extensions;
using System.Data;
代码:
string connectionString = "Server=localhost;Database=SampleSQL_DB;Integrated Security=True";
UserModel objUser1 = new UserModel { UserId = "user0000001" , Name = "Jack", Sex = "Male" };
UserModel objUser2 = new UserModel { UserId = "user0000002", Name = "Marry", Sex = "female" };
UserModel objUser3 = new UserModel { UserId = "user0000003", Name = "Joe", Sex = "male" };
List<UserModel> LstUsers = new List<UserModel>();
LstUsers.Add(objUser2); LstUsers.Add(objUser3);
try
{
using (IDbConnection connection = new System.Data.SqlClient.SqlConnection(connectionString))
{
connection.Open();
using (var trans = connection.BeginTransaction())
{
try
{
// insert single record with custom data model
connection.Insert(objUser1, transaction: trans);
// insert multiple record with List<Type>
connection.Insert(LstUsers, transaction: trans);
// Only save to SQL database if all require SQL operation completed successfully
trans.Commit();
}
catch (Exception e)
{
// If one of the SQL operation fail , roll back the whole transaction
trans.Rollback();
}
}
}
}
catch (Exception e) { }
您还可以使用dapper与存储过程和通用方式，使一切易于管理。
定义你的连接:
public class Connection: IDisposable
{
private static SqlConnectionStringBuilder ConnectionString(string dbName)
{
return new SqlConnectionStringBuilder
{
ApplicationName = "Apllication Name",
DataSource = @"Your source",
IntegratedSecurity = false,
InitialCatalog = Database Name,
Password = "Your Password",
PersistSecurityInfo = false,
UserID = "User Id",
Pooling = true
};
}
protected static IDbConnection LiveConnection(string dbName)
{
var connection = OpenConnection(ConnectionString(dbName));
connection.Open();
return connection;
}
private static IDbConnection OpenConnection(DbConnectionStringBuilder connectionString)
{
return new SqlConnection(connectionString.ConnectionString);
}
protected static bool CloseConnection(IDbConnection connection)
{
if (connection.State != ConnectionState.Closed)
{
connection.Close();
// connection.Dispose();
}
return true;
}
private static void ClearPool()
{
SqlConnection.ClearAllPools();
}
public void Dispose()
{
ClearPool();
}
}
创建一个接口来定义你实际需要的Dapper方法:
public interface IDatabaseHub
{
long Execute<TModel>(string storedProcedureName, TModel model, string dbName);
/// <summary>
/// This method is used to execute the stored procedures with parameter.This is the generic version of the method.
/// </summary>
/// <param name="storedProcedureName">This is the type of POCO class that will be returned. For more info, refer to https://msdn.microsoft.com/en-us/library/vstudio/dd456872(v=vs.100).aspx. </param>
/// <typeparam name="TModel"></typeparam>
/// <param name="model">The model object containing all the values that passes as Stored Procedure's parameter.</param>
/// <returns>Returns how many rows have been affected.</returns>
Task<long> ExecuteAsync<TModel>(string storedProcedureName, TModel model, string dbName);
/// <summary>
/// This method is used to execute the stored procedures with parameter. This is the generic version of the method.
/// </summary>
/// <param name="storedProcedureName">Stored Procedure's name. Expected to be a Verbatim String, e.g. @"[Schema].[Stored-Procedure-Name]"</param>
/// <param name="parameters">Parameter required for executing Stored Procedure.</param>
/// <returns>Returns how many rows have been affected.</returns>
long Execute(string storedProcedureName, DynamicParameters parameters, string dbName);
/// <summary>
///
/// </summary>
/// <param name="storedProcedureName"></param>
/// <param name="parameters"></param>
/// <returns></returns>
Task<long> ExecuteAsync(string storedProcedureName, DynamicParameters parameters, string dbName);
}
实现接口:
public class DatabaseHub : Connection, IDatabaseHub
{
/// <summary>
/// This function is used for validating if the Stored Procedure's name is correct.
/// </summary>
/// <param name="storedProcedureName">Stored Procedure's name. Expected to be a Verbatim String, e.g. @"[Schema].[Stored-Procedure-Name]"</param>
/// <returns>Returns true if name is not empty and matches naming patter, otherwise returns false.</returns>
private static bool IsStoredProcedureNameCorrect(string storedProcedureName)
{
if (string.IsNullOrEmpty(storedProcedureName))
{
return false;
}
if (storedProcedureName.StartsWith("[") && storedProcedureName.EndsWith("]"))
{
return Regex.IsMatch(storedProcedureName,
@"^[\[]{1}[A-Za-z0-9_]+[\]]{1}[\.]{1}[\[]{1}[A-Za-z0-9_]+[\]]{1}$");
}
return Regex.IsMatch(storedProcedureName, @"^[A-Za-z0-9]+[\.]{1}[A-Za-z0-9]+$");
}
/// <summary>
/// This method is used to execute the stored procedures without parameter.
/// </summary>
/// <param name="storedProcedureName">Stored Procedure's name. Expected to be a Verbatim String, e.g. @"[Schema].[Stored-Procedure-Name]"</param>
/// <param name="model">The model object containing all the values that passes as Stored Procedure's parameter.</param>
/// <typeparam name="TModel">This is the type of POCO class that will be returned. For more info, refer to https://msdn.microsoft.com/en-us/library/vstudio/dd456872(v=vs.100).aspx. </typeparam>
/// <returns>Returns how many rows have been affected.</returns>
public long Execute<TModel>(string storedProcedureName, TModel model, string dbName)
{
if (!IsStoredProcedureNameCorrect(storedProcedureName))
{
return 0;
}
using (var connection = LiveConnection(dbName))
{
try
{
return connection.Execute(
sql: storedProcedureName,
param: model,
commandTimeout: null,
commandType: CommandType.StoredProcedure
);
}
catch (Exception exception)
{
throw exception;
}
finally
{
CloseConnection(connection);
}
}
}
public async Task<long> ExecuteAsync<TModel>(string storedProcedureName, TModel model, string dbName)
{
if (!IsStoredProcedureNameCorrect(storedProcedureName))
{
return 0;
}
using (var connection = LiveConnection(dbName))
{
try
{
return await connection.ExecuteAsync(
sql: storedProcedureName,
param: model,
commandTimeout: null,
commandType: CommandType.StoredProcedure
);
}
catch (Exception exception)
{
throw exception;
}
finally
{
CloseConnection(connection);
}
}
}
/// <summary>
/// This method is used to execute the stored procedures with parameter. This is the generic version of the method.
/// </summary>
/// <param name="storedProcedureName">Stored Procedure's name. Expected to be a Verbatim String, e.g. @"[Schema].[Stored-Procedure-Name]"</param>
/// <param name="parameters">Parameter required for executing Stored Procedure.</param>
/// <returns>Returns how many rows have been affected.</returns>
public long Execute(string storedProcedureName, DynamicParameters parameters, string dbName)
{
if (!IsStoredProcedureNameCorrect(storedProcedureName))
{
return 0;
}
using (var connection = LiveConnection(dbName))
{
try
{
return connection.Execute(
sql: storedProcedureName,
param: parameters,
commandTimeout: null,
commandType: CommandType.StoredProcedure
);
}
catch (Exception exception)
{
throw exception;
}
finally
{
CloseConnection(connection);
}
}
}
public async Task<long> ExecuteAsync(string storedProcedureName, DynamicParameters parameters, string dbName)
{
if (!IsStoredProcedureNameCorrect(storedProcedureName))
{
return 0;
}
using (var connection = LiveConnection(dbName))
{
try
{
return await connection.ExecuteAsync(
sql: storedProcedureName,
param: parameters,
commandTimeout: null,
commandType: CommandType.StoredProcedure
);
}
catch (Exception exception)
{
throw exception;
}
finally
{
CloseConnection(connection);
}
}
}
}
你现在可以从模型调用你的需要:
public class DeviceDriverModel : Base
{
public class DeviceDriverSaveUpdate
{
public string DeviceVehicleId { get; set; }
public string DeviceId { get; set; }
public string DriverId { get; set; }
public string PhoneNo { get; set; }
public bool IsActive { get; set; }
public string UserId { get; set; }
public string HostIP { get; set; }
}
public Task<long> DeviceDriver_SaveUpdate(DeviceDriverSaveUpdate obj)
{
return DatabaseHub.ExecuteAsync(
storedProcedureName: "[dbo].[sp_SaveUpdate_DeviceDriver]", model: obj, dbName: AMSDB);//Database name defined in Base Class.
}
}
你也可以传递参数:
public Task<long> DeleteFuelPriceEntryByID(string FuelPriceId, string UserId)
{
var parameters = new DynamicParameters();
parameters.Add(name: "@FuelPriceId", value: FuelPriceId, dbType: DbType.Int32, direction: ParameterDirection.Input);
parameters.Add(name: "@UserId", value: UserId, dbType: DbType.String, direction: ParameterDirection.Input);
return DatabaseHub.ExecuteAsync(
storedProcedureName: @"[dbo].[sp_Delete_FuelPriceEntryByID]", parameters: parameters, dbName: AMSDB);
}
现在从你的控制器调用:
var queryData = new DeviceDriverModel().DeviceInfo_Save(obj);
希望它能防止代码重复，并提供安全性;
