CSharp 调用存储过程来执行增、删、改操作

   对表进行增，删，改数据时，每次都需要访问一次数据库，这样会影响性能；如果把查询的数据拼接成XML形式，作为一个参数整体传给存储过程来处理，这只访问数据库一次，执行速度会快很多。

1.CSharp 代码如下：

public bool CreateUpdateDeleteHelpCategory(HelpCategoryInfo helpCategory, DataProviderAction action)
{
    bool result;
    if (null == helpCategory)
    {
        result = false;
    }
    else
    {
        DbCommand storedProcCommand = this.database.GetStoredProcCommand("cp_HelpCategoryTest_CreateUpdateDelete");
        this.database.AddInParameter(storedProcCommand, "Action", DbType.Int32, (int)action);
        this.database.AddOutParameter(storedProcCommand, "Status", DbType.Int32, 4);
        if (action != DataProviderAction.Create)
        {
            this.database.AddInParameter(storedProcCommand, "CategoryId", DbType.Int32, helpCategory.CategoryId);
        }
        if (action != DataProviderAction.Delete)
        {
            this.database.AddInParameter(storedProcCommand, "Name", DbType.String, helpCategory.Name);
            this.database.AddInParameter(storedProcCommand, "IconUrl", DbType.String, helpCategory.IconUrl);
            this.database.AddInParameter(storedProcCommand, "IndexChar", DbType.String, helpCategory.IndexChar);
            this.database.AddInParameter(storedProcCommand, "Description", DbType.String, helpCategory.Description);
            this.database.AddInParameter(storedProcCommand, "IsShowFooter", DbType.Boolean, helpCategory.IsShowFooter);
        }
        this.database.ExecuteNonQuery(storedProcCommand);
        result = ((int)this.database.GetParameterValue(storedProcCommand, "Status") == 0);
    }
    return result;
}

2.SQL脚本：

CREATE PROCEDURE [dbo].[cp_HelpCategoryTest_CreateUpdateDelete]
    (
        @CategoryId INT = NULL,
        @Name NVARCHAR(100) = NULL,

        @IconUrl NVARCHAR(255) = NULL,
        @IndexChar CHAR(1) = NULL,
        @Description NVARCHAR(1000) = NULL,
        @IsShowFooter BIT = NULL,
        @Action INT,
        @Status INT OUTPUT
    )
AS    
    DECLARE @DisplaySequence INT
    DECLARE @intErrorCode INT
    -- 初始化信息
    SELECT @Status = 99, @intErrorCode = 0
    
    IF @Action = 2 -- 删除
    BEGIN 
        DELETE FROM HelpCategoriesTest WHERE CategoryId = @CategoryId
        IF @@ROWCOUNT = 1
            SET @Status = 0
    END

    IF @Action = 0 -- 创建
    BEGIN
      IF (SELECT MAX(DisplaySequence) FROM HelpCategoriesTest) IS NULL
          SET @DisplaySequence=1
      ELSE
         SET @DisplaySequence=(SELECT MAX(DisplaySequence) FROM HelpCategoriesTest)+1
                
        INSERT INTO HelpCategoriesTest ([Name], DisplaySequence, IconUrl, IndexChar, Description,IsShowFooter)
        VALUES (@Name, @DisplaySequence, @IconUrl, @IndexChar, @Description,@IsShowFooter)
        
        IF @@ROWCOUNT = 1
            SET @Status = 0
        
        RETURN
    END

    IF @Action = 1 -- 修改
    BEGIN
        SET @DisplaySequence=(SELECT DisplaySequence FROM HelpCategoriesTest WHERE CategoryId=@CategoryId)
            
        -- 修改分类信息
        UPDATE HelpCategoriesTest SET [Name] = @Name, DisplaySequence = @DisplaySequence, IconUrl = @IconUrl, IndexChar = @IndexChar, Description = @Description, IsShowFooter = @IsShowFooter
        WHERE CategoryId = @CategoryId
        
        SET @intErrorCode = @intErrorCode + @@ERROR
        
        IF @intErrorCode = 0
        BEGIN
            SET @Status = 0
        END
        
        RETURN
    END