Intersystems caché - 关系映射（自定义 sql 存储）

Question

我在缓存数据库中有更多具有相同数据结构的全局变量。对于每个全局变量，我都用 SQL 存储映射定义了 class，但我需要对所有全局变量进行通用处理。是否可以定义一个 class 和 sql 存储映射，它将在每次 SQL 查询执行之前用于映射？我需要避免为每个需要通过 SQL 访问的全局变量声明 class。我使用 ODBC 执行 SQL 语句。

如果有人能帮助我，我将不胜感激

我的全局变量是这样的：

^glob1("x","y","SL",1)  =   "Name"
^glob1("x","y","SL",1,"Format") =   "myFormat"
^glob1("x","y","SL",1,"Typ")    =   "my Type"
^glob1("x","y","SL",2)  =   "Name2"
^glob1("x","y","SL",2,"Format") =   "myFormat2"
^glob1("x","y","SL",2,"Typ")    =   "Type2"

^nextGlob("x","y","SL",1)   =   "Next Name"
^nextGlob("x","y","SL",1,"Format")  =   "Next myFormat"
^nextGlob("x","y","SL",1,"Typ") =   "my Type"

^another("x","y","SL",13)   =   "Another Name"
^another("x","y","SL",13,"Format")  =   "Another myFormat"
^another("x","y","SL",13,"Typ") =   "Another Type"

我想使用一个 ObjectScript sql 访问全局变量 class。

Answer 1

如果所有全局变量都相同，那么您可以这样做，但很可能您的全局变量都不同，因此不太可能出现单个存储映射。您是否已经拥有描述现有全局变量的数据 dictionary/meta 数据系统？如果是这样，我会考虑将现有数据字典定义的转换写入缓存类.

Answer 2

如果您只需要通过ODBC 从Caché 中读取数据。所以，在 ODBC 中你可以使用 CALL 语句。并且可以写一些SqlProc，可以被ODBC调用。
如我所见，您所有的全局变量都具有相同的结构。如果是这样，那将很容易。你可以把这样的东西放在你的 class.

Query Test() As %Query(ROWSPEC = "ID:%String,Global:%String,Name:%String,Typ:%String,Format:%String") [ SqlProc ]
{
}

ClassMethod TestExecute(ByRef qHandle As %Binary) As %Status
{
    #; Initial settings
    #; List of Globals
    set $li(qHandle,1)=$lb("glob1","nextGlob","another")
    #; Current Global index
    set $li(qHandle,2)=1
    #; Current ID in global
    set $li(qHandle,3)=""
    Quit $$$OK
}

ClassMethod TestClose(ByRef qHandle As %Binary) As %Status [ PlaceAfter = TestExecute ]
{
    Quit $$$OK
}

ClassMethod TestFetch(ByRef qHandle As %Binary, ByRef Row As %List, ByRef AtEnd As %Integer = 0) As %Status [ PlaceAfter = TestExecute ]
{
    set globals=$lg(qHandle,1)
    set globalInd=$lg(qHandle,2)
    set id=$lg(qHandle,3)
    set AtEnd=1
    for {
        set global=$lg(globals,globalInd)
        quit:global=""
        set globalData="^"_global
        set globalData=$na(@globalData@("x","y","SL"))
        set id=$o(@globalData@(id),1,name)
        if id'="" {
            set AtEnd=0
            set typ=$get(@globalData@(id,"Typ"))
            set format=$get(@globalData@(id,"Format"))
            set Row=$lb(id,global,name,typ,format)
            set $li(qHandle,3)=id
            quit
        } elseif $i(globalInd) {
            set id=""
            set $li(qHandle,2)=globalInd
        }
    }
    Quit $$$OK
}

然后你可以像这样执行语句

CALL pkg.classname_test()

结果就是这张照片上的样子

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