我查看了有关此主题的其他问题，但没有一个答案适用和/或对我有用。我在尝试插入数据库时收到“SQLiteConstraintException：错误代码 19：约束失败”错误。
这是我的数据库：
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class StrongDbAdapter {
public static final String KEY_TITLE = "title";
public static final String KEY_BODY = "body";
public static final String KEY_ROWID = "_id";
public static final String WORKOUT_STATE = "workoutState";
public static final String SQUAT_LABEL = "squatLabel";
private static final String TAG = "StrongDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_NAME = "data";
private static final String DATABASE_TABLE = "notes";
private static final int DATABASE_VERSION = 2;
/**
* Database creation sql statement
*/
private static final String DATABASE_CREATE =
"create table notes (_id integer primary key autoincrement , "
+ "title text, workoutState text ," +
" squatLabel text );";
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS notes");
onCreate(db);
}
}
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public StrongDbAdapter(Context ctx) {
this.mCtx = ctx;
}
/**
* Open the notes database. If it cannot be opened, try to create a new
* instance of the database. If it cannot be created, throw an exception to
* signal the failure
*
* @return this (self reference, allowing this to be chained in an
* initialization call)
* @throws SQLException if the database could be neither opened or created
*/
public StrongDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
/**
* Create a new note using the title and body provided. If the note is
* successfully created return the new rowId for that note, otherwise return
* a -1 to indicate failure.
*/
public long createNote(String title, String squatLabel) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_TITLE, title);
//initialValues.put(WORKOUT_STATE, workoutState);
initialValues.put(SQUAT_LABEL, squatLabel);
return mDb.insert(DATABASE_TABLE, null, initialValues);
}
/**
* Delete the note with the given rowId
*
* @param rowId id of note to delete
* @return true if deleted, false otherwise
*/
public boolean deleteNote(long rowId) {
return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
/**
* Return a Cursor over the list of all notes in the database
*
* @return Cursor over all notes
*/
public Cursor fetchAllNotes() {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
WORKOUT_STATE}, null, null, null, null, null);
}
/**
* Return a Cursor positioned at the note that matches the given rowId
*
* @param rowId id of note to retrieve
* @return Cursor positioned to matching note, if found
* @throws SQLException if note could not be found/retrieved
*/
public Cursor fetchNote(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_TITLE, WORKOUT_STATE}, KEY_ROWID + "='" + rowId+"'", null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
/**
* Update the note using the details provided. The note to be updated is
* specified using the rowId
* @param rowId id of note to update
* @param title value to set note title to
* @return true if the note was successfully updated, false otherwise
*/
public boolean updateNote(long rowId, String title) {
ContentValues args = new ContentValues();
args.put(KEY_TITLE, title);
//args.put(WORKOUT_STATE, workoutState);
return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}
这是我的 WorkoutEdit 类中的插入方法
//Saves all the data to the database
private void saveState() {
String title = workoutState;
String squatLabel = squats.getText().toString();
if (mRowId == null) {
long id = mDbHelper.createNote(title, squatLabel);
if (id > 0) {
mRowId = id;
}
} else {
mDbHelper.updateNote(mRowId, title);
}
}
最后，我的 LogCat！
08-04 23:09:22.009: E/Database(26575): Error inserting squatLabel=Squats - 45 title=WorkoutB
08-04 23:09:22.009: E/Database(26575): android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed
08-04 23:09:22.009: E/Database(26575): at android.database.sqlite.SQLiteStatement.native_execute(Native Method)
08-04 23:09:22.009: E/Database(26575): at android.database.sqlite.SQLiteStatement.execute(SQLiteStatement.java)
08-04 23:09:22.009: E/Database(26575): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1677)
08-04 23:09:22.009: E/Database(26575): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1521)
08-04 23:09:22.009: E/Database(26575): at com.anapoleon.android.stronglifts.StrongDbAdapter.createNote(StrongDbAdapter.java:163)
08-04 23:09:22.009: E/Database(26575): at com.anapoleon.android.stronglifts.WorkoutEdit.saveState(WorkoutEdit.java:232)
08-04 23:09:22.009: E/Database(26575): at com.anapoleon.android.stronglifts.WorkoutEdit.onPause(WorkoutEdit.java:214)
08-04 23:09:22.009: E/Database(26575): at android.app.Activity.performPause(Activity.java:4046)
08-04 23:09:22.009: E/Database(26575): at android.app.Instrumentation.callActivityOnPause(Instrumentation.java)
08-04 23:09:22.009: E/Database(26575): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2819)
08-04 23:09:22.009: E/Database(26575): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2789)
08-04 23:09:22.009: E/Database(26575): at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2762)
08-04 23:09:22.009: E/Database(26575): at android.app.ActivityThread.access$1700(ActivityThread.java:135)
08-04 23:09:22.009: E/Database(26575): at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
08-04 23:09:22.009: E/Database(26575): at android.os.Handler.dispatchMessage(Handler.java)
08-04 23:09:22.009: E/Database(26575): at android.os.Looper.loop(Looper.java)
08-04 23:09:22.009: E/Database(26575): at android.app.ActivityThread.main(ActivityThread.java:4385)
08-04 23:09:22.009: E/Database(26575): at java.lang.reflect.Method.invokeNative(Native Method)
08-04 23:09:22.009: E/Database(26575): at java.lang.reflect.Method.invoke(Method.java:507)
08-04 23:09:22.009: E/Database(26575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
08-04 23:09:22.009: E/Database(26575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
08-04 23:09:22.009: E/Database(26575): at dalvik.system.NativeStart.main(Native Method)
先感谢您！