我的字典应用程序项目使用SQLite来存储数据。运行应用程序时，我在方法UNIQUE constraint failed: type.ps中得到了createTablesAndProcess()。
createTablesAndPorcess方法：
public final void createTablesAndProcess() {
boolean z = true;
try {
if (!doesExistsTable("other_words")) {
this.wdb.execSQL("create table if not exists other_words(word TEXT PRIMARY KEY)");
this.wdb.execSQL("INSERT INTO other_words ( word ) SELECT DISTINCT w FROM ( SELECT ot AS w FROM oten UNION SELECT word AS w FROM other )");
}
} catch (Exception e) {
try {
e.printStackTrace();
z = false;
} catch (Exception e2) {
e2.printStackTrace();
return;
}
}
try {
if (!doesExistsTable("new_study_plan")) {
this.wdb.execSQL("create table if not exists new_study_plan(serial INTEGER PRIMARY KEY , word TEXT , add_time INTEGER NOT NULL)");
}
} catch (Exception unused) {
}
try {
if (!doesExistsTable("new_study_plan_other")) {
this.wdb.execSQL("create table if not exists new_study_plan_other(serial INTEGER PRIMARY KEY , word TEXT , add_time INTEGER NOT NULL)");
}
} catch (Exception unused2) {
}
try {
if (!doesExistsTable("new_added")) {
this.wdb.execSQL("create table if not exists new_added(word TEXT PRIMARY KEY , details TEXT NOT NULL)");
}
} catch (Exception unused3) {
}
try {
if (!doesExistsTable("new_history")) {
this.wdb.execSQL("create table if not exists new_history(serial INTEGER PRIMARY KEY , word TEXT , add_time INTEGER NOT NULL)");
}
} catch (Exception unused4) {
}
if (!doesExistsTable("new_history_other")) {
this.wdb.execSQL("create table if not exists new_history_other(serial INTEGER PRIMARY KEY , word TEXT , add_time INTEGER NOT NULL)");
}
//Crash on the below line.
this.wdb.execSQL("INSERT INTO type VALUES ( NULL,'MORE')");
if (z) {
manageInThread();
}
}
初始化数据库任务：
private void initilizeDatabase(final int i, final boolean z) {
new AsyncTask<String, String, String>() {
protected void onPreExecute() {
try {
if (i == Constants.DB_VERSION) {
DictionaryActivity.this.progressMessageView.setVisibility(8);
} else {
DictionaryActivity.this.progressMessageView.setVisibility(0);
}
} catch (Exception e) {
LogUtils.log(DictionaryActivity.this, e);
}
}
protected String doInBackground(String... strArr) {
if (z) {
DatabaseHelper.backupInFile(DictionaryActivity.this, i);
}
DatabaseHelper.manageDatabase(DictionaryActivity.this, false);
try {
DictionaryActivity.this.databaseAccessor = new DatabaseAccessor(DictionaryActivity.this);
} catch (Exception e) {
e.printStackTrace();
}
DictionaryActivity.this.databaseAccessor.createTablesAndPorcess();
//Crash while executing above line.
DictionaryActivity.this.databaseAccessor.initTypeMapping(DictionaryActivity.this.IDSToPS, DictionaryActivity.this.PSToIDS, DictionaryActivity.this.PS_VALUES, DictionaryActivity.this.PS_IDS);
if (z) {
DictionaryActivity.this.databaseAccessor.loadWordFromFile(DictionaryActivity.this);
DictionaryActivity.this.databaseAccessor.restoreFile(DictionaryActivity.this, DictionaryActivity.this.getDatabasePath(Constants.BACKUP_FILE_NAME));
}
return null;
}
protected void onPostExecute(String str) {
try {
DictionaryActivity.this.mainViewAnimator.setDisplayedChild(1);
DictionaryActivity.this.addTabs(DictionaryActivity.TITLE_IDS);
if (DictionaryActivity.this.sharedPreferences.getInt(Constants.KEY_LAST_SHOWN_POPUP_MESSAGE_ID, 0) != 5) {
DictionaryActivity.this.showInitialMessage(false);
} else {
DictionaryActivity.this.manageAutoPopups();
}
DictionaryActivity.this.showSharedText(DictionaryActivity.this.getIntent());
Utils.createShortCut(DictionaryActivity.this, DictionaryActivity.class);
Utils.manageClipboardAndNotificationbar(DictionaryActivity.this);
try {
DictionaryActivity.this.isTTSRequested = false;
Intent intent = new Intent();
intent.setAction("android.speech.tts.engine.CHECK_TTS_DATA");
DictionaryActivity.this.startActivityForResult(intent, DictionaryActivity.CHECK_TTS);
} catch (Exception e) {
e.printStackTrace();
}
DictionaryActivity.this.showHideOCR(true);
DictionaryActivity.this.showOverlayPermissionPopupIfRequired();
} catch (Exception e2) {
if (!(e2 instanceof ActivityNotFoundException)) {
LogUtils.log(DictionaryActivity.this, e2);
}
}
DictionaryActivity.this.isExitingOk = true;
if (DictionaryActivity.this.IDSToPS.size() == 0) {
DictionaryActivity.this.resetDatabase();
}
}
}.execute();
}
当我在initialize方法和createTablesAndProcess行中调用this.wdb.execSQL("INSERT INTO type VALUES ( NULL,'MORE')");时，就会出现错误。如果您需要更多日志，请在评论中告诉我。
更新-Logcat：
2019-06-19 13:31:56.289 20450-20479/com.hdictionary.gu E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.hdictionary.gu, PID: 20450
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:760)
Caused by: android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: type.ps (code 2067)
at android.database.sqlite.SQLiteConnection.nativeExecuteForChangedRowCount(Native Method)
at android.database.sqlite.SQLiteConnection.executeForChangedRowCount(SQLiteConnection.java:734)
at android.database.sqlite.SQLiteSession.executeForChangedRowCount(SQLiteSession.java:754)
at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:64)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1677)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1606)
at com.bappi.db.DatabaseAccessor.createTablesAndPorcess(DatabaseAccessor.java:152)
at com.hdictionary.gu.DictionaryActivity$10.doInBackground(DictionaryActivity.java:1130)
at com.hdictionary.gu.DictionaryActivity$10.doInBackground(DictionaryActivity.java:1100)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
答案 0 :(得分：0)
这是一个简单的错误。表ps中列type的每个元素应该是唯一的，因为您是以这种方式创建表的。但是在执行语句INSERT INTO type VALUES ( NULL,'MORE')时，它已经在NULL列中具有相同的值（如果是第一列，则为ps）。