如何在CrudRepository的外部文件中存储@Query sql？

Question

我正在使用spring和CrudRepository来进行数据库连接。

现在我需要一个很长（几行）的SQL查询，我更喜欢在类路径中的文件中维护，而不是直接在代码中。

但我怎么能做到这一点？ 我的回购如下：

@Query(value = "<my very long sql query>", nativeQuery = true) //how to inject file content?
@Modifying
@Transactional
public void executeSpecificSql();

Answer 1

使用以下步骤。

1. 在src / main / resources中创建jpa-named-queries.property文件 - ＆gt; META-INF文件夹

2. 在给定的属性文件中进行查询。 上面的截图仔细看。这里的组是实体名称，而方法应该匹配与Repository接口中的方法定义。查询应该有对象名而不是表name和instead of column name提供了各个字段的实体中给出的变量名称。

3. 具有属性名称的接口方法方法

   

Answer 2

如果您的项目设置了资源文件夹，请在// based on stock MidasLib unit unit MidasDLL; interface implementation uses Winapi.Windows, Winapi.ActiveX, Datasnap.DSIntf, SysUtils, Registry; // function DllGetDataSnapClassObject(const CLSID, IID: TGUID; var Obj): HResult; stdcall; external 'Midas.DLL'; //var DllGetDataSnapClassObject: function(const CLSID, IID: TGUID; var Obj): HResult; stdcall; //external 'Midas.DLL'; var DllGetDataSnapClassObject: pointer; //external 'Midas.DLL'; const dllFN = 'Midas.DLL'; dllSubN = 'DllGetDataSnapClassObject'; var DllHandle: HMODULE = 0; function RegisteredMidasPath: TFileName; const rpath = '\SOFTWARE\Classes\CLSID\{9E8D2FA1-591C-11D0-BF52-0020AF32BD64}\InProcServer32'; var rry: TRegistry; begin Result := ''; rry := TRegistry.Create( KEY_READ ); try rry.RootKey := HKEY_LOCAL_MACHINE; if rry.OpenKeyReadOnly( rpath ) then begin Result := rry.ReadString(''); if not FileExists( Result ) then Result := ''; end; finally rry.Destroy; end; end; procedure TryFindMidas; var fPath, msg: string; function TryOne(const fName: TFileName): boolean; const ver_16_0 = 1048576; // $00060001 var ver: Cardinal; ver2w: LongRec absolute ver; begin Result := false; ver := GetFileVersion( fName ); if LongInt(ver)+1 = 0 then exit; // -1 --> not found if ver < ver_16_0 then begin msg := msg + #13#10 + 'Obsolete version found: '+IntToStr(ver2w.Hi) + '.' + IntToStr(ver2w.Lo) + ' in library file ' + fName; exit; end; DllHandle := SafeLoadLibrary(fName); if DllHandle = 0 then begin msg := msg + #13#10 + 'Failure loading library ' + fName + '. Maybe this was Win64 DLL or some other reason.'; exit; end; DllGetDataSnapClassObject := GetProcAddress( DllHandle, dllSubN); if nil = DllGetDataSnapClassObject then begin // не найдена msg := msg + #13#10 + 'Incompatible library loaded ' + fName + '. Missed function ' + dllSubN; FreeLibrary( DllHandle ); DllHandle := 0; end; Result := true; end; function TryTwo(const fName: TFileName): boolean; // seek in the given folder and its immediate parent begin Result := TryOne(fName + dllFN); if not Result then Result := TryOne(fName + '..\' + dllFN); // end; begin fPath := ExtractFilePath( ParamStr(0) ); if TryTwo( fPath ) then exit; fPath := IncludeTrailingBackslash( GetCurrentDir() ); if TryTwo( fPath ) then exit; fPath := RegisteredMidasPath; if fPath > '' then if TryOne( fPath ) then exit; msg := 'This program needs the library ' + dllFN + ' version 16.0 or above.'#13#10 + 'It was not found, thus the program can not work.'#13#10 + #13#10 + msg; Winapi.Windows.MessageBox(0, PChar(msg), 'Launch failure!', MB_ICONSTOP or MB_TASKMODAL or MB_DEFAULT_DESKTOP_ONLY or MB_TOPMOST ); Halt(1); end; initialization // RegisterMidasLib(@DllGetDataSnapClassObject); -- static linking does not work for utilities in sub-folders TryFindMidas; // immediately terminates the application if not found RegisterMidasLib(DllGetDataSnapClassObject); finalization if DllHandle <> 0 then if FreeLibrary( DllHandle ) then DllHandle := 0; end. 文件下创建，并将键值对添加为/META-INF/jpa-named-queries.properties。 Spring数据将会上升。

对于较长时间的查询，最好使用带有repoClass.methodName=yoursql标记的xml属性文件：https://stackoverflow.com/a/19128259/1194415

Answer 3

不确定它是否适合您的设置，但是，这可以通过以下方式完成：

1）使用<sql-query>标记

将查询添加到hibernate映射文件中

<sql-query name="MyQuery">.......

2）使用<mapping>标记

定义包含上述文件的hibernate配置文件

<mapping resource="MyQuery.sql.xml"/>

3）使用指向上述配置文件的属性"hibernate.ejb.cfgfile"定义持久性文件

<property name="hibernate.ejb.cfgfile" value="hibernate.cfg.xml"/>

4）使用上面的属性文件来构建EntityManagerFactory

现在，上面的Query可以在Repository方法中使用：

@Query(name = "MyQuery", nativeQuery = true)
[return type] executeMyQuery();