如何获取存储过程和 C# 代码中的总记录？

Question

我正在使用具有用户定义表类型的表值参数，下面是我的代码。我正在尝试从我的数据表中填充我的存储过程。

ALTER PROCEDURE [dbo].[TableName] @dt AS dbo.DataTableAsType 只读

AS
BEGIN
INSERT INTO dbo.[DataTableAsType]
    ([Column names]) --There are 89 column names
SELECT
([ColumnNames])
FROM @dt
END

Second Stored procedure
@totalRecords int OUTPUT
INSERT INTO dbo.tablename1 FROM dbo.tablename2
SELECT @totalRecords = COUNT(*) FROM dbo.[tableName2]







public void InsertDataTableAF2CSV(string ext)
    {

        DataTable tvp = new DataTable();
        string[] arr = new string[89] {"names go here"};

//将 89 个列名 1 乘 1 tvp.Columns.Add(new DataColumn("列名", typeof(string)));

       //populate datarows I currently have over 1,000 rows. 
        DataRow row;
        for (int i = 0; i <= arr.Length; i++)
        {
            row = tvp.NewRow();
            row["Column name"] = i;

            //I add all 89 column names = i then I add rows.
            tvp.Rows.Add(row);
        }
        //read the file name I entered              
        tvp= ReadFile(filename, " ", null);

        //Passing a Table-Valued Parameter to a Stored Procedure
        using (SqlConnection con = new SqlConnection(connection name))
        {
            connection.Open();
            //Execute the cmd
            // Configure the command and parameter. 
            SqlCommand cmd = new SqlCommand("dbo.storedprocedure", connection);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandTimeout = 5000;
            ///SqlParameter tvparam = cmd.Parameters.AddWithValue("@dt", tvp);
            // Create a DataTable with the modified rows.  
            DataTable addedCategories = tvp.GetChanges(DataRowState.Added);
            // these next lines are important to map the C# DataTable object to the correct SQL User Defined Type
            SqlParameter parameter = new SqlParameter("@dt", SqlDbType.Structured)
            {
                //TypeName = "dbo.DataTableAsType",
                TypeName = "dbo.importDataTable",
                Value = tvp
            };                                   
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }

Answer 1

您可能正在尝试在创建数据库之前添加外键。 尝试创建它们，然后在更新它们后添加外键。

[编辑]

这里：

CREATE TABLE ACCOUNT
(ACCT_ID CHAR(10),
BRANCH_ID CHAR(20),
CUST_NUM CHAR(15),
ACCT_TYPE CHAR(20),
FOREIGN KEY (BRANCH_ID) REFERENCES BRANCH_1 (BRANCH_ID),
FOREIGN KEY (CUST_NUM) REFERENCES CUSTOMER_1 (CUST_NUM));

您正在尝试引用尚不存在的 CUSTOMER_1 (CUST_NUM)。

[编辑 2]

您似乎缺少一些索引。 试试这个：

您可能正在尝试在创建数据库之前添加外键。 尝试创建它们，然后在更新它们后添加外键。

[编辑]

这里：

CREATE TABLE ACCOUNT
(ACCT_ID CHAR(10),
BRANCH_ID CHAR(20),
CUST_NUM CHAR(15),
ACCT_TYPE CHAR(20),
FOREIGN KEY (BRANCH_ID) REFERENCES BRANCH_1 (BRANCH_ID),
FOREIGN KEY (CUST_NUM) REFERENCES CUSTOMER_1 (CUST_NUM));

您正在尝试引用尚不存在的 CUSTOMER_1 (CUST_NUM)。

[编辑 2]

试试这个：

CREATE TABLE BRANCH_1
    (BRANCH_ID CHAR(20) PRIMARY KEY,
    BRANCH_NAME CHAR(20),
    BRANCH_ADDRESS CHAR(30));

CREATE TABLE EMPLOYEE
    (EMP_ID CHAR(4) PRIMARY KEY,
    EMP_FNAME CHAR(50),
    EMP_LNAME CHAR(50),
    BRANCH_ID CHAR(20));

    CREATE TABLE ACCOUNT
    (ACCT_ID CHAR(10),
    BRANCH_ID CHAR(20),
    CUST_NUM CHAR(15),
    ACCT_TYPE CHAR(20));

CREATE TABLE CUSTOMER_1
    (CUST_NUM CHAR(15),
    CUS_FNAME CHAR(50),
    CUS_LNAME CHAR(50),
    CUS_ADDRESS CHAR(15),
    BRANCH_ID CHAR(20),
    ACCT_ID CHAR(10),
    LOAN_ID CHAR(10));

CREATE TABLE LOAN
    (LOAN_ID CHAR(10),
    LOAN_NAME CHAR(50),
    LOAN_TYPE CHAR(20),
    CUST_NUM CHAR(15));


ALTER TABLE CUSTOMER_1 ADD INDEX(CUST_NUM);
ALTER TABLE ACCOUNT ADD INDEX(ACCT_ID);
ALTER TABLE EMPLOYEE ADD FOREIGN KEY (BRANCH_ID) REFERENCES BRANCH_1 (BRANCH_ID);
ALTER TABLE ACCOUNT ADD FOREIGN KEY (BRANCH_ID) REFERENCES BRANCH_1 (BRANCH_ID);
ALTER TABLE ACCOUNT ADD FOREIGN KEY (CUST_NUM) REFERENCES CUSTOMER_1 (CUST_NUM);
ALTER TABLE CUSTOMER_1 ADD FOREIGN KEY (BRANCH_ID) REFERENCES BRANCH_1 (BRANCH_ID);
ALTER TABLE CUSTOMER_1 ADD FOREIGN KEY (ACCT_ID) REFERENCES ACCOUNT (ACCT_ID);
ALTER TABLE LOAN ADD FOREIGN KEY (CUST_NUM) REFERENCES CUSTOMER_1 (CUST_NUM);

Answer 2

您的ACCOUNT 表和CUSTOMER_1 具有引发问题的循环外键引用。 here 和 here 已经描述了类似的问题。

我想建议你做一个简化的数据库结构。据我所知，您不需要 ACCOUNT 表中的 CUST_NUM 列，您正在尝试使用来自 CUSTOMER_1 表的外键。尽量保持您的数据库表结构尽可能简单，如我在上面提供的第二个链接中所建议的那样。