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文章摘要

本文介绍了一个用于生成SQL语句的数据库索引自动化工具。该工具能够根据给定的索引信息，生成用于创建或修改索引的SQL命令。核心功能包括处理主键、唯一索引、非唯一约束等不同类型的索引，并根据索引的状态（如是否为唯一、是否为主键等）生成相应的约束条件。该工具通过复杂的CTE查询（包括子查询和FOR XML PATH函数）提取索引信息，并结合条件判断生成具体的SQL脚本，支持自动处理索引创建、修改等操作，能够显著提升数据库管理的效率和准确性。

WITH indexInfo as (
SELECT SCHEMA_NAME(t.schema_id) [schema_name],t.name as [table_name],t1.name as [index_name]
,t1.type,t1.type_desc,t1.is_unique,t1.is_primary_key,t1.is_unique_constraint,t1.has_filter,t1.filter_definition
,STUFF((SELECT ‘,’+t4.name FROM sys.sysindexkeys t2
inner join sys.index_columns t3 ON t2.id=t3.object_id and t2.indid=t3.index_id and t2.colid=t3.column_id
inner join sys.syscolumns t4 ON t2.id=t4.id and t2.colid=t4.colid
WHERE t2.id=t1.object_id and t1.index_id=t2.indid and t2.keyno <> 0 ORDER BY t3.key_ordinal FOR XML PATH(”)),1,1,”) AS index_cols
,STUFF((SELECT ‘,’+t4.name FROM sys.sysindexkeys t2
inner join sys.index_columns t3 ON t2.id=t3.object_id and t2.indid=t3.index_id and t2.colid=t3.column_id
inner join sys.syscolumns t4 ON t2.id=t4.id and t2.colid=t4.colid
WHERE t2.id=t1.object_id and t1.index_id=t2.indid and t2.keyno=0 ORDER BY t3.key_ordinal FOR XML PATH(”)),1,1,”) AS include_cols
FROM sys.tables as t
inner join sys.indexes as t1 on (t1.index_id > 0 and t1.is_hypothetical=0) and (t1.object_id=t.object_id)
WHERE t1.type in(1,2)
), indexInfo2 AS (
SELECT * ,(CASE
WHEN is_primary_key=1
THEN ‘alter table ‘+[schema_name]+’.’+[table_name]+’ add constraint ‘+[index_name]+’ primary key ‘+(CASE WHEN [type]=1 THEN ‘clustered’ ELSE ‘nonclustered’ END)+'(‘+index_cols+’);’
WHEN is_unique=1 AND is_unique_constraint=1
THEN ‘alter table ‘+[schema_name]+’.’+[table_name]+’ add constraint ‘+[index_name]+’ unique ‘+(CASE WHEN [type]=1 THEN ‘clustered’ ELSE ‘nonclustered’ END)+'(‘+index_cols+’);’
WHEN is_unique=1 AND (is_primary_key=0 OR is_unique_constraint=0)
THEN ‘create unique ‘+(CASE WHEN [type]=1 THEN ‘clustered’ ELSE ‘nonclustered’ END)+’ index ‘+[index_name]+’ on ‘+[schema_name]+’.’+[table_name]+'(‘+index_cols+’);’
ELSE ‘create ‘+(CASE WHEN [type]=1 THEN ‘clustered’ ELSE ‘nonclustered’ END)+’ index ‘+[index_name]+’ on ‘+[schema_name]+’.’+[table_name]+'(‘+index_cols+’) ;’
END) script
FROM indexInfo
) SELECT [schema_name],[table_name],[index_name],script
+(CASE WHEN include_cols IS NOT NULL THEN ‘ include(‘+include_cols+’)’ ELSE ” END)
+(CASE WHEN has_filter=1THEN ‘ where ‘+filter_definition ELSE ” END)
FROM indexInfo2
ORDER BY [schema_name],[table_name],[type],[index_name],is_primary_key DESC,is_unique_constraint DESC,is_unique DESC