Android SQLite Contraint冲突.尝试/ Catch无法捕获

Question

08-02 16:26:24.750: E/Database(28841): Error inserting data
08-02 16:26:24.750: E/Database(28841): android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed
08-02 16:26:24.750: E/Database(28841):  at android.database.sqlite.SQLiteStatement.native_execute(Native Method)
08-02 16:26:24.750: E/Database(28841):  at android.database.sqlite.SQLiteStatement.execute(SQLiteStatement.java:61)
08-02 16:26:24.750: E/Database(28841):  at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1584)
08-02 16:26:24.750: E/Database(28841):  at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1428)
08-02 16:26:24.750: E/Database(28841):  at com.app.android.DataOperations.insertItems(DataOperations.java:69)
08-02 16:26:24.750: E/Database(28841):  at com.app.android.DownloadTask.createDatabase(DownloadTask.java:173)
08-02 16:26:24.750: E/Database(28841):  at com.app.android.DownloadTask.doInBackground(DownloadTask.java:59)
08-02 16:26:24.750: E/Database(28841):  at com.app.android.DownloadTask.doInBackground(DownloadTask.java:1)
08-02 16:26:24.750: E/Database(28841):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-02 16:26:24.750: E/Database(28841):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
08-02 16:26:24.750: E/Database(28841):  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
08-02 16:26:24.750: E/Database(28841):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
08-02 16:26:24.750: E/Database(28841):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
08-02 16:26:24.750: E/Database(28841):  at java.lang.Thread.run(Thread.java:1019)

以上是我的LogCat报告.我想要做的是插入数据.看了logcat之后我发现它是一个约束违规.我试着把我的代码作为:

public void insert(...){
            long insertID = 0;
            try{
                Log.i("DataOperation", String.valueOf(insertID));
                insertID = sqllitedb.insert(DBase.TABLE_NAME, null, contentValues);
            }catch(android.database.sqlite.SQLiteException ex){
                Log.i("dataops_", "Error Constraint"); //Print
            }

}

什么都没发生..我的logcat充满了堆栈跟踪.没有评论行的标志(见上文).

怎么办呢.注意在我的整个程序中只有一个插入声明(在上面).测试好然后我会继续.

还告诉我如何处理我的数据库是否已创建/已存在,以便如果存在,我将不会运行我的DownloadTask.

Answer 1

也许insert(..)方法捕获异常本身.

改用使用insertOrThrow(..)方法.

    try {
        SQLiteDatabase db = SQLiteHelper.getDatabase();
        db.insertOrThrow(Table, nullColumnHack, values);
    } catch (SQLiteConstraintException e) {
        Log.d(TAG, "failure to insert word,", e);
        return false;
    }