我对实体框架6非常陌生，我想在我的项目中实现存储过程。我有一个存储过程如下:
ALTER PROCEDURE [dbo].[insert_department]
@Name [varchar](100)
AS
BEGIN
INSERT [dbo].[Departments]([Name])
VALUES (@Name)
DECLARE @DeptId int
SELECT @DeptId = [DeptId]
FROM [dbo].[Departments]
WHERE @@ROWCOUNT > 0 AND [DeptId] = SCOPE_IDENTITY()
SELECT t0.[DeptId]
FROM [dbo].[Departments] AS t0
WHERE @@ROWCOUNT > 0 AND t0.[DeptId] = @DeptId
END
系类:
public class Department
{
public int DepartmentId { get; set; }
public string Name { get; set; }
}
modelBuilder
.Entity<Department>()
.MapToStoredProcedures(s =>
s.Update(u => u.HasName("modify_department")
.Parameter(b => b.Department, "department_id")
.Parameter(b => b.Name, "department_name"))
.Delete(d => d.HasName("delete_department")
.Parameter(b => b.DepartmentId, "department_id"))
.Insert(i => i.HasName("insert_department")
.Parameter(b => b.Name, "department_name")));
protected void btnSave_Click(object sender, EventArgs e)
{
string department = txtDepartment.text.trim();
// here I want to call the stored procedure to insert values
}
我的问题是:如何调用存储过程并将参数传递给它?
在MYsql中创建Procedure。
delimiter //
create procedure SP_Dasboarddata(fromdate date, todate date)
begin
select count(Id) as count,date,status,sum(amount) as amount from
details
where (Emidate between fromdate and todate)
group by date ,status;
END;
//
创建包含存储过程返回结果集值的类
[Table("SP_reslutclass")]
public class SP_reslutclass
{
[Key]
public int emicount { get; set; }
public DateTime Emidate { get; set; }
public int ? Emistatus { get; set; }
public int emiamount { get; set; }
}
在Dbcontext中添加Class
public class ABCDbContext:DbContext
{
public ABCDbContext(DbContextOptions<ABCDbContext> options)
: base(options)
{
}
public DbSet<SP_reslutclass> SP_reslutclass { get; set; }
}
在存储库中调用实体
var counts = _Dbcontext.SP_reslutclass.FromSql("call SP_Dasboarddata
('2019-12-03','2019-12-31')").ToList();
我发现以代码优先的方式调用存储过程并不方便。
我更喜欢用Dapper代替。
下面的代码是用实体框架编写的:
var clientIdParameter = new SqlParameter("@ClientId", 4);
var result = context.Database
.SqlQuery<ResultForCampaign>("GetResultsForCampaign @ClientId", clientIdParameter)
.ToList();
以下代码是用Dapper编写的:
return Database.Connection.Query<ResultForCampaign>(
"GetResultsForCampaign ",
new
{
ClientId = 4
},
commandType: CommandType.StoredProcedure);
我认为第二段代码更容易理解。
.NET Core 5.0没有FromSql，而是有frommsqlraw
下面这些都对我有用。这里的帐户类是c#中的实体，具有与数据库中完全相同的表和列名。
App配置类如下所示
class AppConfiguration
{
public AppConfiguration()
{
var configBuilder = new ConfigurationBuilder();
var path = Path.Combine(Directory.GetCurrentDirectory(), "appsettings.json");
configBuilder.AddJsonFile(path, false);
var root = configBuilder.Build();
var appSetting = root.GetSection("ConnectionStrings:DefaultConnection");
sqlConnectionString = appSetting.Value;
}
public string sqlConnectionString { get; set; }
}
DbContext类:
public class DatabaseContext : DbContext
{
public class OptionsBuild
{
public OptionsBuild()
{
setting = new AppConfiguration();
opsBuilder = new DbContextOptionsBuilder<DatabaseContext>();
opsBuilder.UseSqlServer(setting.sqlConnectionString);
dbOptions = opsBuilder.Options;
}
public DbContextOptionsBuilder<DatabaseContext> opsBuilder { get; set; }
public DbContextOptions<DatabaseContext> dbOptions { get; set; }
private AppConfiguration setting { get; set; }
}
public static OptionsBuild ops = new OptionsBuild();
public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options)
{
//disable initializer
// Database.SetInitializer<DatabaseContext>(null);
}
public DbSet<Account> Account { get; set; }
}
这段代码应该在你的数据访问层:
List<Account> accounts = new List<Account>();
var context = new DatabaseContext(DatabaseContext.ops.dbOptions);
accounts = await context.Account.ToListAsync(); //direct select from a table
var param = new SqlParameter("@FirstName", "Bill");
accounts = await context.Account.FromSqlRaw<Account>("exec Proc_Account_Select",
param).ToListAsync(); //procedure call with parameter
accounts = context.Account.FromSqlRaw("SELECT * FROM dbo.Account").ToList(); //raw query
public static string ToSqlParamsString(this IDictionary<string, string> dict)
{
string result = string.Empty;
foreach (var kvp in dict)
{
result += $"@{kvp.Key}='{kvp.Value}',";
}
return result.Trim(',', ' ');
}
public static List<T> RunSproc<T>(string sprocName, IDictionary<string, string> parameters)
{
string command = $"exec {sprocName} {parameters.ToSqlParamsString()}";
return Context.Database.SqlQuery<T>(command).ToList();
}
