java - SQLite项目中的语法bug，找不到他

Question

我首先尝试使用 SQLite，我有语法错误，但我找不到他 5-6 小时

来自MainActivity.java的代码，在这个类中我调用数据库:

package ua.bellkross.notepadjava;

import android.content.ContentValues;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    EditText editText;
    DatabaseHelper databaseHelper;
    SQLiteDatabase db;
    Cursor userCursor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editText = (EditText) findViewById(R.id.editText);

        databaseHelper = new DatabaseHelper(getApplicationContext());

    }

    @Override
    protected void onResume() {
        super.onResume();
        db = databaseHelper.getWritableDatabase();

        userCursor = db.rawQuery("select * from " + DatabaseHelper.TABLE, null);
        editText.setText(userCursor.getString(userCursor.getColumnIndex(DatabaseHelper.COLUMN_NAME)));
    }

}

来自DatabaseHelper.java的代码，在这段代码中我有语法错误，在方法onCreate中:

package ua.bellkross.notepadjava;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "userstore.db"; // название бд
    private static final int SCHEMA = 1; // версия базы данных
    static final String TABLE = "table"; // название таблицы в бд
    // названия столбцов
    public static final String COLUMN_ID = "_id";
    public static final String COLUMN_NAME = "name";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, SCHEMA);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

        db.execSQL("CREATE TABLE users (" + COLUMN_ID
                + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COLUMN_NAME + " TEXT);");
        // добавление начальных данных
        db.execSQL("INSERT INTO "+ TABLE +"(" + COLUMN_NAME + ") VALUES ('Text');");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS "+TABLE);
        onCreate(db);
    }
}

这是来自 logcat 的消息:

Caused by: android.database.sqlite.SQLiteException: near "table": syntax error (code 1): , while compiling: INSERT INTO table(name) VALUES ('Text'); at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:58) at android.database.sqlite.SQLiteStatement.(SQLiteStatement.java:31) at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1677) at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1608) at ua.bellkross.notepadjava.DatabaseHelper.onCreate(DatabaseHelper.java:25) at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251) at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163) at ua.bellkross.notepadjava.MainActivity.onResume(MainActivity.java:33) at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1269) at android.app.Activity.performResume(Activity.java:6766) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3377) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3440)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2713)  at android.app.ActivityThread.-wrap12(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:154)  at android.app.ActivityThread.main(ActivityThread.java:6077)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)  07-26 10:03:09.757 1375-1382/ua.bellkross.notepadjava W/art: Suspending all threads took: 8.571ms

Answer 1

您正在使用table作为插入的表名称，因此请在插入语句中更改表名称

static final String TABLE = "users"