android - 无法使用外键android sqlite创建表

public class DataHelper extends SQLiteOpenHelper { public static final String DATABASE_NAME = "find.db"; public static final int DATABASE_VERSION = 6; public static final String TABELA_PERCURSOS = "percursos"; public static final String PERCURSO_ID = "_id"; public static final String CIDADE = "cidade"; public static final String CATEGORIA = "categoria"; public static final String INTERESSE = "interesse"; public static final String TABELA_CIDADES = "cidades"; public static final String ID_CIDADES = "_id"; public static final String NOME_CIDADES = "nome"; public static final String TABELA_CATEGORIAS = "categorias"; public static final String ID_CATEGORIAS = "_id"; public static final String NOME_CATEGORIAS = "nome_categorias"; public static final String TABELA_INTERESSES = "interesses"; public static final String ID_INTERESSES = "_id"; public static final String LATITUDE = "latitude"; public static final String LONGITUDE = "longitude"; public static final String DESCRICAO = "descricao"; public static final String NOME_INTERESSE = "nome_interesse"; public static final String ESTADO = "estado"; //0 se nao visitado; 1 se visitado private static final String CREATE_TABELA_CIDADES = "create table " + TABELA_CIDADES + "( " + ID_CIDADES + " integer primary key autoincrement, " + NOME_CIDADES + " text not null unique )"; private static final String CREATE_TABELA_CATEGORIAS = "create table " + TABELA_CATEGORIAS + "( " + ID_CATEGORIAS + " integer primary key autoincrement, " + NOME_CATEGORIAS + " text not null unique )"; private static final String CREATE_TABELA_INTERESSES = "create table " + TABELA_INTERESSES + "( " + ID_INTERESSES + " integer primary key autoincrement, " + LATITUDE + " integer not null unique, " + LONGITUDE + " integer not null unique, " + DESCRICAO + " text not null unique, " + NOME_INTERESSE + " text not null unique, " + ESTADO + " integer)"; public static final String CREATE_TABELA_PERCURSOS = "create table " + TABELA_PERCURSOS + "( " + PERCURSO_ID + " integer primary key autoincrement, " + CIDADE + " integer not null, " + CATEGORIA + " integer not null, " + INTERESSE + " integer), " + "foreign key (" + INTERESSE + ") references " + TABELA_INTERESSES + "(" + ID_INTERESSES + ")"; public DataHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(CREATE_TABELA_CIDADES); db.execSQL(CREATE_TABELA_CATEGORIAS); db.execSQL(CREATE_TABELA_INTERESSES); db.execSQL(CREATE_TABELA_PERCURSOS); db.execSQL("PRAGMA foreign_keys = ON;"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS " + TABELA_CIDADES); db.execSQL("DROP TABLE IF EXISTS " + TABELA_CATEGORIAS); db.execSQL("DROP TABLE IF EXISTS " + TABELA_INTERESSES); db.execSQL("DROP TABLE IF EXISTS " + TABELA_PERCURSOS); onCreate(db); }

**E/SQLiteLog: (1) near ",": syntax error** D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.nagisa.find, PID: 3627 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.nagisa.find/com.example.nagisa.find.MainActivity}: **android.database.sqlite.SQLiteException: near ",": syntax error (code 1): , while compiling: create table percursos( _id integer primary key autoincrement, cidade integer not null, categoria integer not null, interesse integer), foreign key (interesse) references interesses(_id) at **android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: android.database.sqlite.SQLiteException: near ",": syntax error (code 1): , while compiling: create table percursos( _id integer primary key autoincrement, cidade integer not null, categoria integer not null, interesse integer), foreign key (interesse) references interesses(_id) at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1677) at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1608) at com.example.nagisa.find.DataHelper.onCreate(DataHelper.java:73) at com.example.nagisa.find.DataHelper.onUpgrade(DataHelper.java:83) at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:256) at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187) at com.example.nagisa.find.DataHelper.myCursor(DataHelper.java:143) at com.example.nagisa.find.MainActivity.onCreate(MainActivity.java:22) at android.app.Activity.performCreate(Activity.java:6662) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)