java - SQL数据库错误: Table has no column name

Question

我浏览了很多论坛答案，通常问题不是在应该的位置添加“,”或空格，这会将 SQL 语句更改为不应该的内容。

我尝试查看我的，但仍然找不到 onCreate 中的错误。而且我每次都是用Genymotion来模拟应用程序所以不可能是模拟器有以前的数据库版本，所以onUpgrade方法应该不会有问题。

这是日志猫

09-19 07:54:26.137    7344-7344/com.example.cartermah.mywishlist E/SQLiteLog﹕ (1) table wishes has no column named content
09-19 07:54:26.137    7344-7344/com.example.cartermah.mywishlist E/SQLiteDatabase﹕ Error inserting content=jalksjldk title=HIHI recorddate=1442663666139
    android.database.sqlite.SQLiteException: table wishes has no column named content (code 1): , while compiling: INSERT INTO wishes(content,title,recorddate) VALUES (?,?,?)
            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.<init>(SQLiteProgram.java:58)
            at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
            at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467)
            at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
            at data.DatabaseHandler.addWishes(DatabaseHandler.java:67)
            at com.example.cartermah.mywishlist.MainActivity.saveToDB(MainActivity.java:53)
            at com.example.cartermah.mywishlist.MainActivity.access$000(MainActivity.java:15)
            at com.example.cartermah.mywishlist.MainActivity$1.onClick(MainActivity.java:36)
            at android.view.View.performClick(View.java:4240)
            at android.view.View$PerformClick.run(View.java:17721)
            at android.os.Handler.handleCallback(Handler.java:730)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
09-19 07:54:26.137    7344-7344/com.example.cartermah.mywishlist V/Wished saved!﹕ yeah

数据库处理程序代码是

package data;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;

import com.example.cartermah.mywishlist.MainActivity;

import java.sql.Date;
import java.util.ArrayList;

import model.MyWish;

/**
 * Created by CarterMah on 14/09/2015.
 */
public class DatabaseHandler extends SQLiteOpenHelper {


    public final ArrayList<MyWish> wishList = new ArrayList<>();


    public DatabaseHandler(Context context) {
        super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION );
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

        //This is where the table is created

        String CREATE_WISHES_TABLE = "CREATE TABLE " + Constants.TABLE_NAME + "(" + Constants.KEY_ID +
                " INTEGER PRIMARY KEY, " + Constants.TITLE_NAME + " TEXT, " + Constants.CONTENT_NAME +
                " TEXT, " + Constants.DATE_NAME + " LONG" + ");";



        db.execSQL(CREATE_WISHES_TABLE);

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        db.execSQL("DROP TABLE IF EXISTS " + Constants.TABLE_NAME);

        //Create a new table

        onCreate(db);

    }

    public void addWishes (MyWish wish) {

        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();

        values.put(Constants.TITLE_NAME, wish.getTitle());
        values.put(Constants.CONTENT_NAME, wish.getContent());
        values.put(Constants.DATE_NAME, java.lang.System.currentTimeMillis());

        db.insert(Constants.TABLE_NAME, null, values);

        Log.v("Wished saved!","yeah");


        db.close();

    }

    // Get all wishes

    public ArrayList<MyWish> getWishes() {

            String selectQuery = "SELECT * FROM " + Constants.TABLE_NAME;

            SQLiteDatabase db = this.getReadableDatabase();

            Cursor cursor = db.query(Constants.TABLE_NAME, new String[]{Constants.KEY_ID,
                            Constants.TITLE_NAME, Constants.CONTENT_NAME, Constants.DATE_NAME,},
                    null, null, null, null, Constants.DATE_NAME + " DESC");


        // loop through cursor to get every row of data

        if (cursor.moveToFirst()) {

            do{

                MyWish wish = new MyWish();
                wish.setTitle(cursor.getString(cursor.getColumnIndex(Constants.TITLE_NAME)));
                wish.setContent(cursor.getString(cursor.getColumnIndex(Constants.CONTENT_NAME)));

                java.text.DateFormat dateFormat = java.text.DateFormat.getDateInstance();
                String dataData = dateFormat.format(new Date(cursor.getLong(cursor.getColumnIndex(Constants.DATE_NAME))).getTime());


                wish.setRecordDate(dataData);

                wishList.add(wish);

            }while (cursor.moveToNext());
        }



            return wishList;

    }

}

常量.java

public class Constants {

    public static final String DATABASE_NAME = "wishdb";
    public static final int DATABASE_VERSION = 1;
    public static final String TABLE_NAME = "wishes";
    public static final String TITLE_NAME = "title";
    public static final String CONTENT_NAME = "content";
    public static final String DATE_NAME = "recorddate";
    public static final String KEY_ID = "_id";


}

主要 Activity

package com.example.cartermah.mywishlist;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import data.DatabaseHandler;
import model.MyWish;

public class MainActivity extends AppCompatActivity {

    private EditText title;
    private EditText content;
    private Button saveButton;
    private DatabaseHandler dba;

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

        dba = new DatabaseHandler(MainActivity.this);

        title = (EditText)findViewById(R.id.titleEditText);
        content = (EditText)findViewById(R.id.wishEditText);
        saveButton = (Button)findViewById(R.id.saveButton);

        saveButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                saveToDB();
            }
        });






    }

    private void saveToDB() {

        MyWish wish = new MyWish();
        wish.setTitle(title.getText().toString().trim());
        wish.setContent(content.getText().toString().trim());

        dba.addWishes(wish);
        dba.close();

        // clear the form once users click the save button.

        title.setText("");
        content.setText("");

       // Intent i = new Intent(MainActivity.this, WishDetailActivity.class);
       // startActivity(i);

    }


}

Answer 1

插入时需要添加id，因为id不是自增的。或者使id自增。