Question

我已经创建了一个表BookDb，但创建列的查询没有在onCreate()类的DbHelper方法中执行，该方法是SQLiteOpenHelper()的扩展名。

这是课程DbHlelper：

public class DbHelper extends SQLiteOpenHelper {

    public DbHelper(Context context) {
        super(context, Contract.FeedEntry.TABLE_NAME, null, 1);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        final String SQL_CREATE_ENTRIES =
                "CREATE TABLE IF NOT CREATED BookDb( id INTEGER PRIMARY KEY, " +
                        "BookName TEXT, " +
                        "Author TEXT, " +
                        "IssuedOn TEXT, " +
                        "DueDate TEXT, " +
                        "Fine TEXT, " +
                        "Totalfine TEXT )" ;
        db.execSQL(SQL_CREATE_ENTRIES);
        Log.v("Create","TABLE CREATED!!!!!!!!!!");
    }

以下是我插入值的主要活动中的代码：

void SaveEntry() {
    DbHelper db = new DbHelper(this);

    data = db.getWritableDatabase();
    db.onOpen(data);
    //db.onCreate(data);

    ContentValues values = new ContentValues();
    values.put(Contract.FeedEntry.COLUMN_NAME_Bname, bname);
    values.put(Contract.FeedEntry.COLUMN_NAME_AUTHOR, authname);
    values.put(Contract.FeedEntry.COLUMN_NAME_Issue, issuedate);
    values.put(Contract.FeedEntry.COLUMN_NAME_DUE, dueafter);
    values.put(Contract.FeedEntry.COLUMN_NAME_FINE_PER_DAY, fine);

    long rowId = data.insert(Contract.FeedEntry.TABLE_NAME, null, values);
}

这是合同类：

public class Contract {

    private Contract() {}

    /* Inner class that defines the table contents */
    public static class FeedEntry implements BaseColumns {
        public static final String TABLE_NAME = "BookDb";
        public static final String COLUMN_NAME_Bname = "BookName";
        public static final String COLUMN_NAME_AUTHOR="Author";
        public static final String COLUMN_NAME_Issue = "IssuedOn";
        public static final String COLUMN_NAME_DUE="DueDate";
        public static final String COLUMN_NAME_FINE_PER_DAY="Fine";
        public  static final String COLUMN_NAME_TFINE="TotalFine";
    }
}

日志显示::

E / SQLiteLog：（1）表BookDb没有名为Fine的列 E / SQLiteDatabase：错误插入Fine = nc IssuedOn = vz Author = jx DueDate = bz BookName = va android.database.sqlite.SQLiteException：table BookDb没有名为Fine（code 1）的列:,编译时：INSERT INTO BookDb（Fine，IssuedOn，Author，DueDate，BookName）VALUES（？，？，？，？，？）在android.database.sqlite.SQLiteConnection.nativePrepareStatement（本机方法）在android.database.sqlite.SQLiteConnection.acquirePreparedStatement（SQLiteConnection.java:889）在android.database.sqlite.SQLiteConnection.prepare（SQLiteConnection.java:500）在android.database.sqlite.SQLiteSession.prepare（SQLiteSession.java:588）在android.database.sqlite.SQLiteProgram。（SQLiteProgram.java:58）在android.database.sqlite.SQLiteStatement。（SQLiteStatement.java:31）在android.database.sqlite.SQLiteDatabase.insertWithOnConflict（SQLiteDatabase.java:1469）在android.database.sqlite.SQLiteDatabase.insert（SQLiteDatabase.java:1341） at com.example.shaily.librarian.AddBook.SaveEntry（AddBook.java:219）在com.example.shaily.librarian.AddBook.onClick（AddBook.java:91）在android.view.View.performClick（View.java:4791）在android.view.View $ PerformClick.run（View.java:19884）在android.os.Handler.handleCallback（Handler.java:739）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:135）在android.app.ActivityThread.main（ActivityThread.java:5268） at java.lang.reflect.Method.invoke（Native Method）在java.lang.reflect.Method.invoke（Method.java:372）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:902）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:697）

android中的sqlite数据库中的列未被创建

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