如何使用代码将值传递给存储过程中的指定参数？

Question

The following is my code

public static DataSet GetDataSet(string storedProcedure, params object[] parameters)
{
    ConnectionHelper c = new ConnectionHelper();
    c.opencon();
    c.getcmd.CommandType = CommandType.StoredProcedure;
    c.getcmd.CommandText = storedProcedure;
    c.getcmd.Parameters.Clear();

    SqlCommandBuilder.DeriveParameters(c.getcmd);
    int i = 0, j = 0;

    foreach (SqlParameter SPParams in c.getcmd.Parameters)
    {
        if (j > 0)
        {
            SPParams.Value = parameters[i];
            i++;
        }
        j++;
    }

    DataSet ds = new DataSet();

    SqlDataAdapter da = new SqlDataAdapter();
    da.SelectCommand = c.getcmd;
    da.Fill(ds);

    return ds;
}

Answer 1

Instead of:

public static DataSet GetDataSet(string storedProcedure, params object[] parameters)

Try passing parameters as a key value pair. Example:

public static DataSet GetDataSet(string storedProcedure, params KeyValuePair<string, object> parameters)

string will store the name of the parameter and object will hold the value. This way you can pass value by named parameters. Only these parameter's value will be set and rest will remain null (order doesn't matter)

Usage:

foreach (var param in parameters)
{
   c.getcmd.Parameters.Add(new SqlParameter(param.Key, param.Value));
}

Answer 2

I belive you are looking for something like this. Here one stored procedure with all insert update delete select together. @QueryType must to pass all every single time, however the rest variable need to call only when needed because it assignd default values respectively if no value is passed.

Example >> MyTable has 3 fields, ID (int PK autoincrease, Field1 int, Field2 varchar(20), Below is single stored procedure.

CREATE PROCEDURE uspInserUpdateDeleteSelect 
    -- Add the parameters for the stored procedure here
    @QueryType varchar(10),
    @ID int = 0,
    @Field1 int = 0,
    @Field2 varchar(20) = NULL

BEGIN
        IF @QueryType = 'INSERT' BEGIN
            INSERT INTO MyTable (Field1, Field2) VALUES (@Field1, @Field2)
        END

        ELSE IF @QueryType = 'UPDATE' BEGIN
            UPDATE MyTable 
            SET Field1 = @Field1, Field2 = @Field2
            WHERE ID=@ID
        END

        ELSE IF @QueryType = 'DELETE' BEGIN
            DELETE FROM MyTable
            WHERE ID=@ID
        END

        ELSE IF @QueryType = 'SELECTALL' BEGIN
            SELECT * FROM MyTable
        END

        ELSE IF @QueryType = 'SELECTBYID' BEGIN
            SELECT * FROM MyTable WHERE ID=@ID  
        END

END


//For params Error, create a new class and pass as list of the class

    public class ParaNameValue
    {
        public string ParaName{ get; set; }
        public string ParaValue{ get; set; }

        public ParaNameValue(string PName, string PValue){
            this.ParaName=PName;
            this.ParaValue = PValue;
        }
    }

//For caller function, how to pass parameter list

    List<ParaNameValue> ListPara= new List<ParaNameValue>();
    ListPara.Add(new ParaNameValue("@Name", "BlaBla 1");
    ListPara.Add(new ParaNameValue("@Email", "BlaBla 2");

    GetDataSet(string storedProcedure, ListPara);


//for dataset function
    public static DataSet GetDataSet(string storedProcedure, List<ParaNameValue> ParaList)"
    {
        //do other stuffs here

        //getting sqlpara values
        foreach (ParaNameValue p in ParaList)
        {
             c.getcmd.Parameters.Add(new SqlParameter(p.ParaName, p.ParaValue));
        }
    }