尝试创建SQLite数据库时，我收到以下LogCat异常：
引起：android.database.sqlite.SQLiteException：无法将只读数据库从版本0升级到1
这是我的代码：
import static android.provider.BaseColumns._ID;
import static org.inetizen.university_timetable.Constants.DAY_OF_WEEK;
import static org.inetizen.university_timetable.Constants.DURATION;
import static org.inetizen.university_timetable.Constants.MODULE_CODE;
import static org.inetizen.university_timetable.Constants.ROOM;
import static org.inetizen.university_timetable.Constants.START_TIME;
import static org.inetizen.university_timetable.Constants.TABLE_NAME;
import static org.inetizen.university_timetable.Constants.TYPE_OF_SESSION;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class TimeTableData extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "timetable.db";
private static final int DATABASE_VERSION = 1;
/** Create a helper object for the TimeTable database **/
public TimeTableData(Context ctx) {
super(ctx, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_NAME + " (" +_ID
+ " INTEGER PRIMARY KEY AUTOINCREMENT " + MODULE_CODE
+ " TEXT NOT NULL " + DAY_OF_WEEK + " TEXT NOT NULL "
+ START_TIME + " INTEGER NOT NULL " + DURATION
+ " INTEGER NOT NULL " + TYPE_OF_SESSION + " TEXT NOT NULL "
+ ROOM + " TEXT NOT NULL )");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
这是我的LogCat：
05-09 12:32:04.525: I/Database(601): sqlite returned: error code = 1, msg = near "module_code": syntax error 05-09 12:32:04.525: E/Database(601): Failure 1 (near "module_code": syntax error) on 0x252588 when preparing 'CREATE TABLE table_name (_id INTEGER PRIMARY KEY AUTOINCREMENT module_code TEXT NOT NULL day_of_week TEXT NOT NULL start_time INTEGER NOT NULL duration INTEGER NOT NULL type_of_session TEXT NOT NULL room TEXT NOT NULL );'. 05-09 12:32:04.535: E/SQLiteOpenHelper(601): Couldn't open timetable.db for writing (will try read-only): 05-09 12:32:04.535: E/SQLiteOpenHelper(601): android.database.sqlite.SQLiteException: near "module_code": syntax error: CREATE TABLE table_name (_id INTEGER PRIMARY KEY AUTOINCREMENT module_code TEXT NOT NULL day_of_week TEXT NOT NULL start_time INTEGER NOT NULL duration INTEGER NOT NULL type_of_session TEXT NOT NULL room TEXT NOT NULL ); 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.database.sqlite.SQLiteDatabase.native_execSQL(Native Method) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1727) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at org.inetizen.university_timetable.TimeTableData.onCreate(TimeTableData.java:26) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:106) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:158) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at org.inetizen.university_timetable.TimeTable.getClasses(TimeTable.java:57) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at org.inetizen.university_timetable.TimeTable.onCreate(TimeTable.java:46) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.os.Handler.dispatchMessage(Handler.java:99) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.os.Looper.loop(Looper.java:123) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at java.lang.reflect.Method.invokeNative(Native Method) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at java.lang.reflect.Method.invoke(Method.java:521) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-09 12:32:04.535: E/SQLiteOpenHelper(601): at dalvik.system.NativeStart.main(Native Method) 05-09 12:32:04.545: D/AndroidRuntime(601): Shutting down VM 05-09 12:32:04.545: W/dalvikvm(601): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 05-09 12:32:04.555: E/AndroidRuntime(601): FATAL EXCEPTION: main 05-09 12:32:04.555: E/AndroidRuntime(601): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.inetizen.university_timetable/org.inetizen.university_timetable.TimeTable}: android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 4: /data/data/org.inetizen.university_timetable/databases/timetable.db 05-09 12:32:04.555: E/AndroidRuntime(601): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.os.Handler.dispatchMessage(Handler.java:99) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.os.Looper.loop(Looper.java:123) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-09 12:32:04.555: E/AndroidRuntime(601): at java.lang.reflect.Method.invokeNative(Native Method) 05-09 12:32:04.555: E/AndroidRuntime(601): at java.lang.reflect.Method.invoke(Method.java:521) 05-09 12:32:04.555: E/AndroidRuntime(601): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-09 12:32:04.555: E/AndroidRuntime(601): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-09 12:32:04.555: E/AndroidRuntime(601): at dalvik.system.NativeStart.main(Native Method) 05-09 12:32:04.555: E/AndroidRuntime(601): Caused by: android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 4: /data/data/org.inetizen.university_timetable/databases/timetable.db 05-09 12:32:04.555: E/AndroidRuntime(601): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:170) 05-09 12:32:04.555: E/AndroidRuntime(601): at org.inetizen.university_timetable.TimeTable.getClasses(TimeTable.java:57) 05-09 12:32:04.555: E/AndroidRuntime(601): at org.inetizen.university_timetable.TimeTable.onCreate(TimeTable.java:46) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-09 12:32:04.555: E/AndroidRuntime(601): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 05-09 12:32:04.555: E/AndroidRuntime(601): ... 11 more 05-09 12:32:07.325: I/Database(611): sqlite returned: error code = 1, msg = near "module_code": syntax error 05-09 12:32:07.325: E/Database(611): Failure 1 (near "module_code": syntax error) on 0x119778 when preparing 'CREATE TABLE table_name (_id INTEGER PRIMARY KEY AUTOINCREMENT module_code TEXT NOT NULL day_of_week TEXT NOT NULL start_time INTEGER NOT NULL duration INTEGER NOT NULL type_of_session TEXT NOT NULL room TEXT NOT NULL );'. 05-09 12:32:07.335: E/SQLiteOpenHelper(611): Couldn't open timetable.db for writing (will try read-only): 05-09 12:32:07.335: E/SQLiteOpenHelper(611): android.database.sqlite.SQLiteException: near "module_code": syntax error: CREATE TABLE table_name (_id INTEGER PRIMARY KEY AUTOINCREMENT module_code TEXT NOT NULL day_of_week TEXT NOT NULL start_time INTEGER NOT NULL duration INTEGER NOT NULL type_of_session TEXT NOT NULL room TEXT NOT NULL ); 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.database.sqlite.SQLiteDatabase.native_execSQL(Native Method) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1727) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at org.inetizen.university_timetable.TimeTableData.onCreate(TimeTableData.java:26) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:106) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:158) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at org.inetizen.university_timetable.TimeTable.getClasses(TimeTable.java:57) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at org.inetizen.university_timetable.TimeTable.onCreate(TimeTable.java:46) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.os.Handler.dispatchMessage(Handler.java:99) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.os.Looper.loop(Looper.java:123) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at java.lang.reflect.Method.invokeNative(Native Method) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at java.lang.reflect.Method.invoke(Method.java:521) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-09 12:32:07.335: E/SQLiteOpenHelper(611): at dalvik.system.NativeStart.main(Native Method) 05-09 12:32:07.345: D/AndroidRuntime(611): Shutting down VM 05-09 12:32:07.345: W/dalvikvm(611): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 05-09 12:32:07.355: E/AndroidRuntime(611): FATAL EXCEPTION: main 05-09 12:32:07.355: E/AndroidRuntime(611): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.inetizen.university_timetable/org.inetizen.university_timetable.TimeTable}: android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 4: /data/data/org.inetizen.university_timetable/databases/timetable.db 05-09 12:32:07.355: E/AndroidRuntime(611): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.os.Handler.dispatchMessage(Handler.java:99) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.os.Looper.loop(Looper.java:123) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-09 12:32:07.355: E/AndroidRuntime(611): at java.lang.reflect.Method.invokeNative(Native Method) 05-09 12:32:07.355: E/AndroidRuntime(611): at java.lang.reflect.Method.invoke(Method.java:521) 05-09 12:32:07.355: E/AndroidRuntime(611): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-09 12:32:07.355: E/AndroidRuntime(611): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-09 12:32:07.355: E/AndroidRuntime(611): at dalvik.system.NativeStart.main(Native Method) 05-09 12:32:07.355: E/AndroidRuntime(611): Caused by: android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 4: /data/data/org.inetizen.university_timetable/databases/timetable.db 05-09 12:32:07.355: E/AndroidRuntime(611): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:170) 05-09 12:32:07.355: E/AndroidRuntime(611): at org.inetizen.university_timetable.TimeTable.getClasses(TimeTable.java:57) 05-09 12:32:07.355: E/AndroidRuntime(611): at org.inetizen.university_timetable.TimeTable.onCreate(TimeTable.java:46) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-09 12:32:07.355: E/AndroidRuntime(611): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 05-09 12:32:07.355: E/AndroidRuntime(611): ... 11 more
有关如何解决异常的任何建议？
答案 0 :(得分：8)
您使用的SQL语法看起来不正确，您缺少逗号。试试这个：
db.execSQL("CREATE TABLE " + TABLE_NAME + " (" +_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + MODULE_CODE + " TEXT NOT NULL, " + DAY_OF_WEEK + " TEXT NOT NULL, " + START_TIME + " INTEGER NOT NULL, " + DURATION + " INTEGER NOT NULL, " + TYPE_OF_SESSION + " TEXT NOT NULL, " + ROOM + " TEXT NOT NULL)");
答案 1 :(得分：2)
您可以尝试 getWritableDatabase（）。 这个链接可以帮到你。
答案 2 :(得分：1)
你没有显示你的db.open方法......我敢打赌你没有把db打开成可写的。看起来应该是这样的：
public GroceryDB open() throws SQLException {
mDBHelper = new DBHelper(mCtx);
mDb = mDBHelper.getWritableDatabase();
return this;
}