Question

我可以从这样的2个表中查询吗？

public Cursor getSen_List(long id_thsen ) {
    String strTmp = "select "
        +SENS_TABLE+"."+KEY_SEN_ID+","
        +SENS_TABLE+"."+KEY_SEN_ID_TH_SEN+","
        +SENS_TABLE+"."+KEY_SEN_ID_LANG+","
        +SENS_TABLE+"."+KEY_SEN+","
        +SENS_TABLE+"."+KEY_SEN_READING+","    
        +LANGS_TABLE+"."+KEY_LANG
        +" from "+SENS_TABLE+ ","+LANGS_TABLE
        +" where "+SENS_TABLE+"."+KEY_SEN_ID_TH_SEN + "=" + id_thsen+ " and " 
        +SENS_TABLE+"."+KEY_LANG+"=  " +("select"
                                    +LANGS_TABLE+"."+KEY_LANG
                                    +"from"+LANGS_TABLE
                                    +"where"+LANGS_TABLE+"."+KEY_ACT+"=1");


                    return db.rawQuery(strTmp,null);}

这是我的logcat

02-11 02:45:02.814: ERROR/AndroidRuntime(625): FATAL EXCEPTION: main
02-11 02:45:02.814: ERROR/AndroidRuntime(625): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.proj/com.android.proj.Sens_Show}: android.database.sqlite.SQLiteException: no such column: Sentences.lang: , while compiling: select Sentences._id,Sentences.id_thsen,Sentences.id_lang,Sentences.sen,Sentences.reading,Languages.lang from Sentences,Languages where Sentences.id_thsen=1 and Sentences.lang=  (select Languages.lang from Languages where Languages.active_status=1)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.os.Looper.loop(Looper.java:123)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.app.ActivityThread.main(ActivityThread.java:4627)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at java.lang.reflect.Method.invokeNative(Native Method)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at java.lang.reflect.Method.invoke(Method.java:521)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at dalvik.system.NativeStart.main(Native Method)
02-11 02:45:02.814: ERROR/AndroidRuntime(625): Caused by: android.database.sqlite.SQLiteException: no such column: Sentences.lang: , while compiling: select Sentences._id,Sentences.id_thsen,Sentences.id_lang,Sentences.sen,Sentences.reading,Languages.lang from Sentences,Languages where Sentences.id_thsen=1 and Sentences.lang=  (select Languages.lang from Languages where Languages.active_status=1)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:46)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1345)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1315)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at com.android.proj.DBAdapter.getSen_List(DBAdapter.java:881)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at com.android.proj.Sens_Show.listData(Sens_Show.java:89)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at com.android.proj.Sens_Show.onCreate(Sens_Show.java:64)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
02-11 02:45:02.814: ERROR/AndroidRuntime(625):     ... 11 more

句子表

private static final String CREATE_TABLE_7 =
    " create table " + SENS_TABLE +
    " (_id integer primary key autoincrement," +
    " id_thsen integer REFERENCES Thai_sentences(_id)," +
    " id_lang integer REFERENCES Languages(_id)," +
    " sen text not null," +
    " reading text not null);";

语言表`

private static final String CREATE_TABLE_3 =
    " create table " + LANGS_TABLE +
    " (_id integer primary key autoincrement," +
    " lang text not null," +
    " active_status integer not null);";

正确的语言，但发生5次像语言数量

public Cursor getSen_List(long id_thsen ) {
    String strTmp = "select "
        +SENS_TABLE+"."+KEY_SEN_ID+","
        +SENS_TABLE+"."+KEY_SEN_ID_TH_SEN+","
        +SENS_TABLE+"."+KEY_SEN_ID_LANG+","
        +SENS_TABLE+"."+KEY_SEN+","
        +SENS_TABLE+"."+KEY_SEN_READING+","    
        +LANGS_TABLE+"."+KEY_LANG
        +" from "+SENS_TABLE+ ","+LANGS_TABLE
        +" where "+SENS_TABLE+"."+KEY_SEN_ID_TH_SEN + "=" + id_thsen+ " and " 
        +SENS_TABLE+"."+KEY_LANG_ID+"=  " +("(select "
                                    +LANGS_TABLE+"."+KEY_LANG_ID
                                    +" from "+LANGS_TABLE
                                    +" where "+LANGS_TABLE+"."+KEY_ACT+"=1)");


                    return db.rawQuery(strTmp,null);}

Answer 1

您的子查询中需要select，from和where周围的空格。您可能也应该将该子查询括在()中。

public Cursor getSen_List(long id_thsen ) {
    String strTmp = "select "
        +SENS_TABLE+"."+KEY_SEN_ID+","
        +SENS_TABLE+"."+KEY_SEN_ID_TH_SEN+","
        +SENS_TABLE+"."+KEY_SEN_ID_LANG+","
        +SENS_TABLE+"."+KEY_SEN+","
        +SENS_TABLE+"."+KEY_SEN_READING+","    
        +LANGS_TABLE+"."+KEY_LANG
        +" from "+SENS_TABLE+ ","+LANGS_TABLE
        +" where "+SENS_TABLE+"."+KEY_SEN_ID_TH_SEN + "=" + id_thsen+ " and " 
        +SENS_TABLE+"."+KEY_LANG+"=  " +("(select "
                                    +LANGS_TABLE+"."+KEY_LANG
                                    +" from "+LANGS_TABLE
                                    +" where "+LANGS_TABLE+"."+KEY_ACT+"=1)");


                    return db.rawQuery(strTmp,null);}

修改

现在您已经发布了可以看到此行的日志

Caused by: android.database.sqlite.SQLiteException: no such column: Sentences.lang:

指向错误。 Sentences表中没有列lang

我可以从这样的2个表中查询吗？

1 个答案: