java - How to map an interger key to an @ManyToOne object within the same @Entity? -

-

is possible have optional integer column map @manytoone object @ same time?

table:

id,name,catalogid

accordingly class:

@entity class mytable {     @id     private long id;     private string name;      private integer catalogid;        @manytoone     @joincolum(name = "catalogid", foreignkey = @foreignkey(name="fk_catalog"), nullable=true)     private mycatalog catalog; }  @entity class mycatalog {     @id     private int catalogid;      //some more fields...      @onetomany(mappedby = "catalog")     private set<mytable> mytables; }

when create object, know catalogid already, foreign mapped table not yet have content catalogid.

question: possible define @manytoone optional? thus, set catalogid value, let hibernate create object if can linked foreign table?


Comments

Post a Comment

Popular posts from this blog

Capture and play voice with Asterisk ARI -

-
there channel ari demo in wich can control channel state: ring, answer, play silence, play tone or audio-file ( https://github.com/asterisk/ari-examples/tree/master/channel-state , https://wiki.asterisk.org/wiki/display/ast/ari+and+channels%3a+manipulating+channel+state ) possible receive chunks (parts, buffers, etc.) of call voice (which created remote subscriber) or write chunks of voice, example array of bytes (not file) in audio format (alaw, ulow etc). you can use asterisk eagi interface voice data. other option use record or mixmonitor app record channel(channel have put stasis allow dialplan control ari) "write chunks of voice" can done application playback also can create own application using c/c++, compile asterisk , result want. no, can't redirect voice directly using ari.
Read more

c - Unrecognised emulation mode: elf_i386 on MinGW32 -

-
i'm trying make kernel, , cannot link c output assembly. ld . i'm getting error: unrecognized emulation mode: elf_i386 i'm using windows 10 professional mingw32 , msys. code using: link.ld /* * link.ld */ output_format(elf32-i386) entry(start) sections { . = 0x100000; .text : { *(.text) } .data : { *(.data) } .bss : { *(.bss) } } kernel.c /* * kernel.c */ void kmain(void) { const char *str = "my first kernel"; char *vidptr = (char*)0xb8000; //video mem begins here. unsigned int = 0; unsigned int j = 0; /* loops clears screen * there 25 lines each of 80 columns; each element takes 2 bytes */ while(j < 80 * 25 * 2) { /* blank character */ vidptr[j] = ' '; /* attribute-byte - light grey on black screen */ vidptr[j+1] = 0x07; j = j + 2; } j = 0; /* loop writes string video memory */ while(str[j] != '\0') { /...
Read more

magic numbers - Java's checkstyle, MagicNumberCheck -

-
i using checkstyle reportings source-code. question magicnumbercheck . i using date/(org.joda.)datetime in source code this: datetime datetime = new datetime(2013, 2, 27, 23, 0): datetime.plushours(57); is there way suppress magicnumbercheck notifications if magic number within date or datetime? you can use suppressioncommentfilter check this. configure properties values (in checkstyle configuration file) <module name="suppressioncommentfilter"> <property name="offcommentformat" value="check\:off\: ([\w\|]+)"/> <property name="oncommentformat" value="check\:on\: ([\w\|]+)"/> <property name="checkformat" value="$1"/> </module> now required lines, can like //check:off: magicnumber datetime datetime = new datetime(2013, 2, 27, 23, 0): datetime.plushours(57); //check:on: magicnumber this suppress magicnumber checks , rest checks work here. you can su...
Read more