标签：scalar 学习 logs class code tin and int new
原文：http://www.entityframeworktutorial.net/entityframework6/database-command-interception.aspx
本节，将学习如何在执行数据库命令时拦截EF。
EF 6提供了在对数据库执行ExecuteNonQuery，ExecuteScalar，ExecuteReader操作之前和之后使用IDbCommandInterceptor拦截上下文的能力。
首先，实现IDbCommandInterceptor，如下所示：
class EFCommandInterceptor: IDbCommandInterceptor { public void NonQueryExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext) { LogInfo("NonQueryExecuted", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText)); } public void NonQueryExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext) { LogInfo("NonQueryExecuting", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText)); } public void ReaderExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContextt<System.Data.Common.DbDataReader> interceptionContext) { LogInfo("ReaderExecuted", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText)); } public void ReaderExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext) { LogInfo("ReaderExecuting", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText)); } public void ScalarExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext) { LogInfo("ScalarExecuted", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText)); } public void ScalarExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext) { LogInfo("ScalarExecuting", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText)); } private void LogInfo(string command, string commandText) { Console.WriteLine("Intercepted on: {0} :- {1} ", command, commandText); } }
可以在上面的代码中看到，IDbCommandInterceptor提供了六种执行方法。
现在，需要使用配置文件或基于代码的配置来配置拦截器。
配置文件：
<entityFramework>
<interceptors>
<interceptor type="EF6DBFirstTutorials.EFCommandInterceptor, EF6DBFirstTutorials">
</interceptor>
</interceptors>
</entityFramework>
基于代码配置：
public class FE6CodeConfig : DbConfiguration { public FE6CodeConfig() { this.AddInterceptor(new EFCommandInterceptor()); } }
所以现在我们可以在DbContext执行ExecuteNonQuery，ExecuteScalar和ExecuteReader时记录命令。
标签：scalar 学习 logs class code tin and int new
原文地址：http://www.cnblogs.com/talentzemin/p/7389586.html
