Qt Android client for Postresql
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I read ton of posts and articles about my issue and I found that the best way is building web service for it because no one could build Qt SQL plugin for Android.
This is really horrible news for me because:
I don't know which is the start point to write the web service app. for my Postgresql database. Does Fortune Server is the right start point?
I already coded a big Qt client so converting it to client compatible with web service means more code and I afraid it may a big :(
May you please help me to find the right start point for developing the web service? and what's your advice for decreasing the modification in the client.?
P.S. I feel very upset because when I created the desktop client I thought Qt is ready for Android I never expected that.
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Hi,
This is not a Qt problem per se. The plugin needs a native build of PostgreSQL's library for android, which AFAIK doesn't exist.
However I've seen "this":http://code.google.com/p/psqldroid that might interest you.
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hello. a newbie here so pardon me foor noob question but can you please tell me if i can use these pre-built libraries to my project or i'll have to build myself? next problem is that i don't know how to add these .so libraries to my project. I tried to add this line in .pro file but that didn't work. the apk doesn't include this lib in the "lib" folder when seen using winRaR
@LIBS += -L "e:\sqlib" -libpq.so@ -
hello. a newbie here so pardon me foor noob question but can you please tell me if i can use these pre-built libraries to my project or i'll have to build myself? next problem is that i don't know how to add these .so libraries to my project. I tried to add this line in .pro file but that didn't work. the apk doesn't include this lib in the "lib" folder when seen using winRaR
@LIBS += -L "e:\sqlib" -libpq.so@ -
this is the application output:
@I/Qt ( 7822): qt start
D/dalvikvm( 7822): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e6f98
W/System.err( 7822): java.lang.reflect.InvocationTargetException
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.loadApplication(QtActivity.java:245)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.startApp(QtActivity.java:655)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:895)
W/System.err( 7822): at android.app.Activity.performCreate(Activity.java:5008)
W/System.err( 7822): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
W/System.err( 7822): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
W/System.err( 7822): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
W/System.err( 7822): at android.app.ActivityThread.access$600(ActivityThread.java:130)
W/System.err( 7822): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
W/System.err( 7822): at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err( 7822): at android.os.Looper.loop(Looper.java:137)
W/System.err( 7822): at android.app.ActivityThread.main(ActivityThread.java:4745)
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
W/System.err( 7822): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
W/System.err( 7822): at dalvik.system.NativeStart.main(Native Method)
W/System.err( 7822): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1306]: 36 cannot locate 'sigemptyset'...
W/System.err( 7822): at java.lang.Runtime.load(Runtime.java:340)
W/System.err( 7822): at java.lang.System.load(System.java:521)
W/System.err( 7822): at org.qtproject.qt5.android.QtNative.loadBundledLibraries(QtNative.java:156)
W/System.err( 7822): at org.qtproject.qt5.android.QtActivityDelegate.loadApplication(QtActivityDelegate.java:430)
W/System.err( 7822): ... 19 more@ -
this is the application output:
@I/Qt ( 7822): qt start
D/dalvikvm( 7822): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e6f98
W/System.err( 7822): java.lang.reflect.InvocationTargetException
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.loadApplication(QtActivity.java:245)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.startApp(QtActivity.java:655)
W/System.err( 7822): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:895)
W/System.err( 7822): at android.app.Activity.performCreate(Activity.java:5008)
W/System.err( 7822): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
W/System.err( 7822): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
W/System.err( 7822): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
W/System.err( 7822): at android.app.ActivityThread.access$600(ActivityThread.java:130)
W/System.err( 7822): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
W/System.err( 7822): at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err( 7822): at android.os.Looper.loop(Looper.java:137)
W/System.err( 7822): at android.app.ActivityThread.main(ActivityThread.java:4745)
W/System.err( 7822): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7822): at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7822): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
W/System.err( 7822): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
W/System.err( 7822): at dalvik.system.NativeStart.main(Native Method)
W/System.err( 7822): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1306]: 36 cannot locate 'sigemptyset'...
W/System.err( 7822): at java.lang.Runtime.load(Runtime.java:340)
W/System.err( 7822): at java.lang.System.load(System.java:521)
W/System.err( 7822): at org.qtproject.qt5.android.QtNative.loadBundledLibraries(QtNative.java:156)
W/System.err( 7822): at org.qtproject.qt5.android.QtActivityDelegate.loadApplication(QtActivityDelegate.java:430)
W/System.err( 7822): ... 19 more@ -
The problem is this that it cannot locate 'sigemptyset'...
isgemptyset should be in libc.so but is missing in the older android builds.
The workaround that works for me was to staticlally link libc. I uploaded the changes and the lib is now 10x larger at 2MB. I'll update the wiki and include instructions to statically link.
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The problem is this that it cannot locate 'sigemptyset'...
isgemptyset should be in libc.so but is missing in the older android builds.
The workaround that works for me was to staticlally link libc. I uploaded the changes and the lib is now 10x larger at 2MB. I'll update the wiki and include instructions to statically link.
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with the new lib file the app crashes without showing any message. and application output is:
@{ . . .
I/Qt (27083): qt start
D/dalvikvm(27083): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e4508
F/libc (27083): Fatal signal 11 (SIGSEGV) at 0x00006c23 (code=1), thread 27083 (.example.btchat)
}@EDIT: The app seems to be working on my phone. However I don't know whether it should work the same way as described in Qt documentation or not. The code given under doesn't seem to be making database connection (hence else part is executed) :
@
QSqlDatabase db= QSqlDatabase::addDatabase("QPSQL");db.setHostName("89.129.198.19"); db.setDatabaseName("abcde"); db.setUserName("activa"); db.setPassword("X123xyz"); db.setPort(5432); bool ok = db.open(); if(!ok) { QMessageBox::information(this,"Connection","Connection Failed!"); } else { QMessageBox::information(this,"Connection","Connection Established!"); }@
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with the new lib file the app crashes without showing any message. and application output is:
@{ . . .
I/Qt (27083): qt start
D/dalvikvm(27083): Trying to load lib /data/data/org.qtproject.example.btchat/lib/libpq.so 0x411e4508
F/libc (27083): Fatal signal 11 (SIGSEGV) at 0x00006c23 (code=1), thread 27083 (.example.btchat)
}@EDIT: The app seems to be working on my phone. However I don't know whether it should work the same way as described in Qt documentation or not. The code given under doesn't seem to be making database connection (hence else part is executed) :
@
QSqlDatabase db= QSqlDatabase::addDatabase("QPSQL");db.setHostName("89.129.198.19"); db.setDatabaseName("abcde"); db.setUserName("activa"); db.setPassword("X123xyz"); db.setPort(5432); bool ok = db.open(); if(!ok) { QMessageBox::information(this,"Connection","Connection Failed!"); } else { QMessageBox::information(this,"Connection","Connection Established!"); }@
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[quote author="antreimer" date="1424547268"]The first so file I uploaded was only tested against lollipop. The second one was also tested against KitKat. I'll look into it. My brother has a Jellybean phone.[/quote]
i've edited my post. please the app seems to be working on my phone but now the database connection is not being established :P
BTW i'm testing it on KitKat too