执行了这个存储过程之后出现了一堆错误,表创建成功了,但是索引什么的都没加上,这是怎么回事?? USE [ YXComments ] GO DECLARE @return_value int EXEC @return_value = [ dbo ] . [ procAddComment ] @ParentID = 0 , @SourceID = 1 , @NickName = N '
执行了这个存储过程之后出现了一堆错误,表创建成功了,但是索引什么的都没加上,这是怎么回事??
<span>USE</span> <span>[</span><span>YXComments</span><span>]</span> <span>GO</span> <span>DECLARE</span> <span>@return_value</span> <span>int</span> <span>EXEC</span> <span>@return_value</span> <span>=</span> <span>[</span><span>dbo</span><span>]</span>.<span>[</span><span>procAddComment</span><span>]</span> <span>@ParentID</span> <span>=</span> <span>0</span><span>, </span><span>@SourceID</span> <span>=</span> <span>1</span><span>, </span><span>@NickName</span> <span>=</span> N<span>'</span><span>afasf</span><span>'</span><span>, </span><span>@Content</span> <span>=</span> N<span>'</span><span>sdfasdfsdf</span><span>'</span><span>, </span><span>@IP</span> <span>=</span> N<span>'</span><span>127.0.0.1</span><span>'</span><span>, </span><span>@City</span> <span>=</span> N<span>'</span><span>南阳</span><span>'</span><span>, </span><span>@BeFiltered</span> <span>=</span> <span>0</span><span>, </span><span>@Enable</span> <span>=</span> <span>1</span><span>, </span><span>@Key</span> <span>=</span> N<span>'</span><span>soft</span><span>'</span> <span>SELECT</span> <span>'</span><span>Return Value</span><span>'</span> <span>=</span> <span>@return_value</span>
消息 102,级别 15,状态 1,第 2 行
'GO' 附近有语法错误。
消息 102,级别 15,状态 1,第 2 行
'GO' 附近有语法错误。
消息 102,级别 15,状态 1,第 2 行
'GO' 附近有语法错误。
消息 102,级别 15,状态 1,第 2 行
'GO' 附近有语法错误。
消息 102,级别 15,状态 1,第 2 行
'GO' 附近有语法错误。
消息 102,级别 15,状态 1,第 2 行
'GO' 附近有语法错误。
消息 102,级别 15,状态 1,第 2 行
'GO' 附近有语法错误。
(1 行受影响)
消息 515,级别 16,状态 2,第 1 行
不能将值 NULL 插入列 'Cai',表 'YXComments.dbo.comments_soft1';列不允许有 Null 值。INSERT 失败。
语句已终止。
(1 行受影响)
<span>/*</span><span>***** Script for SelectTopNRows command from SSMS *****</span><span>*/</span> <span>ALTER</span> <span>proc</span> <span>[</span><span>dbo</span><span>]</span>.<span>[</span><span>procAddComment</span><span>]</span><span> ( </span><span>@ParentID</span> <span>int</span><span>, </span><span>@SourceID</span> <span>int</span><span>, </span><span>@NickName</span> <span>nvarchar</span>(<span>20</span><span>), </span><span>@Content</span> <span>nvarchar</span>(<span>300</span><span>), </span><span>@IP</span> <span>nvarchar</span>(<span>30</span><span>), </span><span>@City</span> <span>nvarchar</span>(<span>30</span><span>), </span><span>@BeFiltered</span> <span>bit</span><span>, </span><span>@Enable</span> <span>bit</span><span>, </span><span>@Key</span> <span>nvarchar</span>(<span>50</span><span>) ) </span><span>as</span> <span>begin</span> <span>declare</span> <span>@tableName</span> <span>nvarchar</span>(<span>80</span><span>); </span><span>declare</span> <span>@tableArea</span> <span>int</span><span>; </span><span>declare</span> <span>@mod</span> <span>int</span><span>; </span><span>declare</span> <span>@Size</span> <span>int</span><span>; </span><span>set</span> <span>@Size</span> <span>=</span> <span>100000</span><span>; </span><span>set</span> <span>@mod</span> <span>=</span> <span>@SourceID</span> <span>%</span> <span>@Size</span><span>; </span><span>if</span> <span>@mod</span> <span>></span> <span>0</span> <span>set</span> <span>@tableArea</span> <span>=</span> <span>Cast</span>(<span>@SourceID</span> <span>/</span> <span>@Size</span> <span>as</span> <span>int</span>) <span>+</span> <span>1</span><span>; </span><span>else</span> <span>set</span> <span>@tableArea</span> <span>=</span> <span>Cast</span>(<span>@SourceID</span> <span>/</span> <span>@Size</span> <span>as</span> <span>int</span><span>); </span><span>set</span> <span>@tableName</span> <span>=</span> <span>'</span><span>comments_</span><span>'</span> <span>+</span> <span>@Key</span> <span>+</span> <span>Cast</span>(<span>@tableArea</span> <span>as</span> <span>nvarchar</span>(<span>10</span><span>)); </span><span>if</span> <span>not</span> <span>Exists</span>(<span>select</span> <span>*</span> <span>from</span> <span>[</span><span>CommentsTables</span><span>]</span> <span>where</span> <span>[</span><span>Key</span><span>]</span><span>=</span><span>@Key</span> <span>and</span> <span>[</span><span>TableName</span><span>]</span><span>=</span><span>@tableName</span><span>) </span><span>begin</span> <span>declare</span> <span>@CreateSQL</span> <span>nvarchar</span>(<span>MAX</span><span>); </span><span>set</span> <span>@CreateSQL</span> <span>=</span> <span>'</span><span>Create table [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>]( [ID] [int] IDENTITY(1,1) NOT NULL, [ParentID] [int] NOT NULL, [SourceID] [int] NOT NULL, [NickName] [nvarchar](20) NOT NULL, [Content] [nvarchar](300) NOT NULL, [Datetime] [datetime] NOT NULL, [IP] [nvarchar](30) NOT NULL, [City] [nvarchar](30) NOT NULL, [BeFiltered] [bit] NOT NULL, [Enable] [bit] NOT NULL, [Lou] [int] NOT NULL, [Ding] [int] NOT NULL, [Cai] [int] NOT NULL, CONSTRAINT [PK_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] PRIMARY KEY CLUSTERED ( [ID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY]</span><span>'</span> <span>EXEC</span>(<span>@CreateSQL</span><span>); </span><span>EXEC</span>(<span>'</span><span>ALTER TABLE [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] ADD CONSTRAINT [DF_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>_ParentID] DEFAULT ((0)) FOR [ParentID] GO </span><span>'</span><span>); </span><span>EXEC</span>(<span>'</span><span>ALTER TABLE [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] ADD CONSTRAINT [DF_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>_Datetime] DEFAULT (getdate()) FOR [Datetime] GO </span><span>'</span><span>); </span><span>EXEC</span>(<span>'</span><span>ALTER TABLE [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] ADD CONSTRAINT [DF_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>_BeFiltered] DEFAULT ((0)) FOR [BeFiltered] GO </span><span>'</span><span>); </span><span>EXEC</span>(<span>'</span><span>ALTER TABLE [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] ADD CONSTRAINT [DF_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>_Enable] DEFAULT ((0)) FOR [Enable] GO </span><span>'</span><span>); </span><span>EXEC</span>(<span>'</span><span>ALTER TABLE [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] ADD CONSTRAINT [DF_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>_Lou] DEFAULT ((1)) FOR [Lou] GO </span><span>'</span><span>); </span><span>EXEC</span>(<span>'</span><span>ALTER TABLE [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] ADD CONSTRAINT [DF_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>_Ding] DEFAULT ((0)) FOR [Ding] GO </span><span>'</span><span>); </span><span>EXEC</span>(<span>'</span><span>ALTER TABLE [dbo].[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>] ADD CONSTRAINT [DF_</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>_Cai] DEFAULT ((0)) FOR [Cai] GO </span><span>'</span><span>); </span><span>Insert</span> <span>Into</span> <span>[</span><span>CommentsTables</span><span>]</span>(<span>[</span><span>Key</span><span>]</span>,<span>[</span><span>TableName</span><span>]</span>) <span>values</span>(<span>@Key</span>,<span>@tableName</span><span>); </span><span>end</span> <span>set</span> <span>@NickName</span> <span>=</span> <span>Replace</span>(<span>@NickName</span>,<span>''''</span>,<span>''''''</span><span>); </span><span>set</span> <span>@Content</span> <span>=</span> <span>Replace</span>(<span>@Content</span>,<span>''''</span>,<span>''''''</span><span>); </span><span>set</span> <span>@IP</span> <span>=</span> <span>Replace</span>(<span>@IP</span>,<span>''''</span>,<span>''''''</span><span>); </span><span>set</span> <span>@City</span> <span>=</span> <span>Replace</span>(<span>@City</span>,<span>''''</span>,<span>''''''</span><span>); </span><span>Exec</span>(<span>'</span><span>Insert Into dbo.[</span><span>'</span><span>+</span><span>@tableName</span><span>+</span><span>'</span><span>](ParentID,SourceID,NickName,Content,IP,City,BeFiltered,[Enable]) values (</span><span>'</span><span>+</span><span>@ParentID</span><span>+</span><span>'</span><span>,</span><span>'</span><span>+</span><span>@SourceID</span><span>+</span><span>'</span><span>,</span><span>'''</span><span>+</span><span>@NickName</span><span>+</span><span>'''</span><span>,</span><span>'''</span><span>+</span><span>@Content</span><span>+</span><span>'''</span><span>,</span><span>'''</span><span>+</span><span>@IP</span><span>+</span><span>'''</span><span>,</span><span>'''</span><span>+</span><span>@City</span><span>+</span><span>'''</span><span>,</span><span>'</span><span>+</span><span>@BeFiltered</span><span>+</span><span>'</span><span>,</span><span>'</span><span>+</span><span>@Enable</span><span>+</span><span>'</span><span>);</span><span>'</span><span>) </span><span>end</span> <span>GO</span>

InnoDB使用redologs和undologs確保數據一致性和可靠性。 1.redologs記錄數據頁修改,確保崩潰恢復和事務持久性。 2.undologs記錄數據原始值,支持事務回滾和MVCC。

EXPLAIN命令的關鍵指標包括type、key、rows和Extra。 1)type反映查詢的訪問類型,值越高效率越高,如const優於ALL。 2)key顯示使用的索引,NULL表示無索引。 3)rows預估掃描行數,影響查詢性能。 4)Extra提供額外信息,如Usingfilesort提示需要優化。

Usingtemporary在MySQL查詢中表示需要創建臨時表,常見於使用DISTINCT、GROUPBY或非索引列的ORDERBY。可以通過優化索引和重寫查詢避免其出現,提升查詢性能。具體來說,Usingtemporary出現在EXPLAIN輸出中時,意味著MySQL需要創建臨時表來處理查詢。這通常發生在以下情況:1)使用DISTINCT或GROUPBY時進行去重或分組;2)ORDERBY包含非索引列時進行排序;3)使用複雜的子查詢或聯接操作。優化方法包括:1)為ORDERBY和GROUPB

MySQL/InnoDB支持四種事務隔離級別:ReadUncommitted、ReadCommitted、RepeatableRead和Serializable。 1.ReadUncommitted允許讀取未提交數據,可能導致臟讀。 2.ReadCommitted避免臟讀,但可能發生不可重複讀。 3.RepeatableRead是默認級別,避免臟讀和不可重複讀,但可能發生幻讀。 4.Serializable避免所有並發問題,但降低並發性。選擇合適的隔離級別需平衡數據一致性和性能需求。

MySQL適合Web應用和內容管理系統,因其開源、高性能和易用性而受歡迎。 1)與PostgreSQL相比,MySQL在簡單查詢和高並發讀操作上表現更好。 2)相較Oracle,MySQL因開源和低成本更受中小企業青睞。 3)對比MicrosoftSQLServer,MySQL更適合跨平台應用。 4)與MongoDB不同,MySQL更適用於結構化數據和事務處理。

MySQL索引基数对查询性能有显著影响:1.高基数索引能更有效地缩小数据范围,提高查询效率;2.低基数索引可能导致全表扫描,降低查询性能;3.在联合索引中,应将高基数列放在前面以优化查询。

MySQL學習路徑包括基礎知識、核心概念、使用示例和優化技巧。 1)了解表、行、列、SQL查詢等基礎概念。 2)學習MySQL的定義、工作原理和優勢。 3)掌握基本CRUD操作和高級用法,如索引和存儲過程。 4)熟悉常見錯誤調試和性能優化建議,如合理使用索引和優化查詢。通過這些步驟,你將全面掌握MySQL的使用和優化。

MySQL在現實世界的應用包括基礎數據庫設計和復雜查詢優化。 1)基本用法:用於存儲和管理用戶數據,如插入、查詢、更新和刪除用戶信息。 2)高級用法:處理複雜業務邏輯,如電子商務平台的訂單和庫存管理。 3)性能優化:通過合理使用索引、分區表和查詢緩存來提升性能。


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