SQL 触发器调用WebApi

1.需求数据库表添加，修改，删除数据，触发器生效，推送数据数据到WCF接口

2.可行方案2种，第一种创建数据库项目形式

a)创建WCF服务，发布服务

b)启用数据库CLR功能，默认是关闭状态

EXEC sp_configure 'show advanced options' , '1';
go
reconfigure;
go
EXEC sp_configure 'clr enabled' , '1'
go
reconfigure;
-- Turn advanced options back off
EXEC sp_configure 'show advanced options' , '0';
go

c)设置数据库安全选项

use custdb
ALTER DATABASE custdb SET TRUSTWORTHY ON
reconfigure

d)创建WCF触发器运行环境

CREATE ASSEMBLY 
SMDiagnostics from
'C:\Windows\Microsoft.NET\Framework\v3.0\Windows Communication Foundation\SMdiagnostics.dll'
with permission_set = UNSAFE

GO

CREATE ASSEMBLY 
[System.Web] from
'C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Web.dll'
with permission_set = UNSAFE

GO

CREATE ASSEMBLY 
[System.Messaging] from
'C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Messaging.dll'
with permission_set = UNSAFE

GO

CREATE ASSEMBLY  
[System.IdentityModel] from
'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\System.IdentityModel.dll'
with permission_set = UNSAFE

GO

CREATE ASSEMBLY  
[System.IdentityModel.Selectors] from
'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\System.IdentityModel.Selectors.dll'
with permission_set = UNSAFE

GO

CREATE ASSEMBLY -- this will add service modal

[Microsoft.Transactions.Bridge] from
'C:\Windows\Microsoft.NET\Framework\v3.0\Windows Communication Foundation\Microsoft.Transactions.Bridge.dll'
with permission_set = UNSAFE

GO

e)创建数据库项目
数据库–》Visual C# Sql Server数据库项目连接数据库

f)编写出发器代码

WCFTrigger.cs 代码如下

using System;
using Client.SQLCLRServiceReference;
using Microsoft.SqlServer.Server;
using System.ServiceModel;
public partial class Triggers
{

    //本代理用来提供异步调用属性，异步处理比同步操作阻塞通道直到完成操作速度要开上好几十毫秒
    public delegate void MyDelagate(String crudType);

    //在本项目添加WCF服务之后，生成的客户端。
   static readonly ServiceContractClient proxy = new ServiceContractClient(new WSHttpBinding(), new EndpointAddress("http://127.0.0.1:8888/WCF_CLRService"));

    /// <summary>
   /// [SqlProcedure()]将程序集中本方法的定义标记为存储过程，这样在SQL服务器上注册该方法时，就能被认出来
    /// </summary>
    /// <param name="crudType"></param>
    [SqlProcedure()]
    public static void SendData(String crudType)
    {

        /*A very simple procedure that accepts a string parameter 
          based on the CRUD action performed by the
          trigger. It switches based on this parameter 
          and calls the appropriate method on the service proxy*/

        switch (crudType)
        {
            case "Update":

                proxy.UpdateOccured();

                break;

            case "Insert":

                proxy.InsertOccured();
                break;
        }

    }

    /// <summary>
    /// [SqlTrigger()]将程序集中本方法的定义标记为触发器，这样在SQL服务器上注册该方法时，就能被认出来
    /// Name 属性是指我们在SQL中要生成的触发器的名字
    /// Target 对应哪张表
    /// Event 对应哪些事件
    /// </summary>
    [SqlTrigger(Name = "WCFTrigger",
       Target = "tbCR", Event = "FOR UPDATE, INSERT")]
    public static void Trigger1()
    {
        //获触发器的上下文
        SqlTriggerContext myContext = SqlContext.TriggerContext;

        MyDelagate d;

        switch (myContext.TriggerAction)
        {
            case TriggerAction.Update:
                {
                    d = new MyDelagate(SendData);
                    //异步调用
                    d.BeginInvoke("Update", null, null);

                }
                break;

            case TriggerAction.Insert:
                {
                    d = new MyDelagate(SendData);
                    d.BeginInvoke("Insert", null, null);
                }
                break;

        }

    }

}

g)设置数据库全线集安全改为无限制

3.第二种方案，创建数据库脚触发器形式，创建Trigger,调用存储过程，存储过程实现调用WebApi

create trigger ts_sex
on student2
after insert
as
if exists(select * from student2 where s_sex not in('男','女'))
begin 
raiserror ('学生性别只能为“男”或者“女”',16,1)
rollback transaction
end

insert into student2
values('2016020203','whp','男',NULL,NULL,NULL,NULL,'20160101')

注：整合的资源

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SQL 触发器调用WebApi

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