插入列表&LT;&GT;到SQL Server表 [英] Inserting a List<> into SQL Server table
问题描述
我有一个实体报告
我要插入到数据库表中的值。的报告
下面的属性必须被插入的:
I have an entity Report
whose values I want to insert into a database table. The following attributes of Report
have to be inserted:
reportID - int
RoleID - int
Created_BY = SYSTEM(default)
CURRENT_TIMESTAMP
现在的问题是与第二属性。我与 LIST℃的报告;角色与GT;
属性。 角色
是它有一个 ID
和一个定义良好的实体名称
。从这个名单上有提取每一个角色,并插入每个角色的ID到表中。
Now the problem is with the 2nd attribute. I have a report with the LIST<ROLES>
attributes. ROLES
is a well defined entity which has an ID
and a NAME
. From this list I have to extract every role and insert each role's ID into the table.
所以我的查询presently看起来如下:
So my query presently looks as below :
INSERT INTO REPORT_MARJORIE_ROLE(REPORT_ID, ROLE_ID, CREATED_BY, CREATED)
VALUES({0}, {1}, 'SYSTEM', CURRENT_TIMESTAMP)
从那里我解析这些值的C#code是如下:
The C# code from where I am parsing these values is as follows :
try
{
StringBuilder _objSQL = new StringBuilder();
_objSQL.AppendFormat(Queries.Report.ReportQueries.ADD_NEW_ROLES, report.ID, "report.MarjorieRoles.Add(MarjorieRole"));
_objDBWriteConnection.ExecuteQuery(_objSQL.ToString());
_objDBWriteConnection.Commit();
_IsRolesAdded = true;
}
所以,请指导我如何从C#功能添加角色
So please guide me how to add roles from C# function
推荐答案
的我假设你说的 SQL (结构化查询语言),你真的意味着微软的 SQL Server的(实际的数据库产品),而不是 - 右的
I'm assuming you say SQL (structured query language) and you really mean Microsoft SQL Server (the actual database product) instead - right?
您不能将整个列表作为一个整体到SQL Server - 你需要插入一行为每个条目。这意味着,你需要多次调用INSERT语句。
You cannot insert a whole list as a whole into SQL Server - you need to insert one row for each entry. This means, you need to call the INSERT statement multiple times.
做这样的:
// define the INSERT statement using **PARAMETERS**
string insertStmt = "INSERT INTO dbo.REPORT_MARJORIE_ROLE(REPORT_ID, ROLE_ID, CREATED_BY, CREATED) " +
"VALUES(@ReportID, @RoleID, 'SYSTEM', CURRENT_TIMESTAMP)";
// set up connection and command objects in ADO.NET
using(SqlConnection conn = new SqlConnection(-your-connection-string-here))
using(SqlCommand cmd = new SqlCommand(insertStmt, conn)
{
// define parameters - ReportID is the same for each execution, so set value here
cmd.Parameters.Add("@ReportID", SqlDbType.Int).Value = YourReportID;
cmd.Parameters.Add("@RoleID", SqlDbType.Int);
conn.Open();
// iterate over all RoleID's and execute the INSERT statement for each of them
foreach(int roleID in ListOfRoleIDs)
{
cmd.Parameters["@RoleID"].Value = roleID;
cmd.ExecuteNonQuery();
}
conn.Close();
}
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