java - SQLite 错误代码 = 1

Question

我正在尝试将一些数据插入我的 SQLite 数据库。但我收到错误代码 1，表示我的列不存在。有人可以帮助我吗，下面是我的代码:

08-17 13:12:46.473: I/Database(13328): sqlite returned: error code = 1, msg = table login has no column named uid
08-17 13:12:46.503: E/Database(13328): Error inserting uid=502e7b90657ab1.86949026 created_at=2012-08-17 12:12:48 email=epaas name=hwheuu
08-17 13:12:46.503: E/Database(13328): android.database.sqlite.SQLiteException: table login has no column named uid: , while compiling: INSERT INTO login(uid, created_at, email, name) VALUES(?, ?, ?, ?);
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:41)
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1231)
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1658)
08-17 13:12:46.503: E/Database(13328):  at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1515)
08-17 13:12:46.503: E/Database(13328):  at library.DatabaseHandler.addUser(DatabaseHandler.java:69)
08-17 13:12:46.503: E/Database(13328):  at com.thryfting.www.RegisterActivity$register.doInBackground(RegisterActivity.java:135)
08-17 13:12:46.503: E/Database(13328):  at com.thryfting.www.RegisterActivity$register.doInBackground(RegisterActivity.java:1)
08-17 13:12:46.503: E/Database(13328):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-17 13:12:46.503: E/Database(13328):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
08-17 13:12:46.503: E/Database(13328):  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
08-17 13:12:46.503: E/Database(13328):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
08-17 13:12:46.503: E/Database(13328):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
08-17 13:12:46.503: E/Database(13328):  at java.lang.Thread.run(Thread.java:1027)

下面是我的数据库代码:

package library;

import java.util.HashMap;

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

public class DatabaseHandler extends SQLiteOpenHelper {

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "thryfting_api";

    // Login table name
    private static final String TABLE_LOGIN = "login";

    // Login Table Columns names
    private static final String KEY_ID = "id";
    private static final String KEY_NAME = "name";
    private static final String KEY_EMAIL = "email";
    private static final String KEY_UID = "uid";
    private static final String KEY_CREATED_AT = "created_at";

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

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_LOGIN + "("
                + KEY_ID + " INTEGER PRIMARY KEY,"
                + KEY_NAME + " TEXT,"
                + KEY_EMAIL + " TEXT UNIQUE,"
                + KEY_UID + " INTEGER,"
                + KEY_CREATED_AT + " TEXT" + ")";
        db.execSQL(CREATE_LOGIN_TABLE);
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);

        // Create tables again
        onCreate(db);
    }

    /**
     * Storing user details in database
     * */
    public void addUser(String name, String email, String uid, String created_at) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, name); // Name
        values.put(KEY_EMAIL, email); // Email
        values.put(KEY_UID, uid); // Email
        values.put(KEY_CREATED_AT, created_at); // Created At

        // Inserting Row
        db.insert(TABLE_LOGIN, null, values);
        db.close(); // Closing database connection
    }

    /**
     * Getting user data from database
     * */
    public HashMap<String, String> getUserDetails(){
        HashMap<String,String> user = new HashMap<String,String>();
        String selectQuery = "SELECT  * FROM " + TABLE_LOGIN;

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        // Move to first row
        cursor.moveToFirst();
        if(cursor.getCount() > 0){
            user.put("name", cursor.getString(1));
            user.put("email", cursor.getString(2));
            user.put("uid", cursor.getString(3));
            user.put("created_at", cursor.getString(4));
        }
        cursor.close();
        db.close();
        // return user
        return user;
    }

    /**
     * Getting user login status
     * return true if rows are there in table
     * */
    public int getRowCount() {
        String countQuery = "SELECT  * FROM " + TABLE_LOGIN;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int rowCount = cursor.getCount();
        db.close();
        cursor.close();

        // return row count
        return rowCount;
    }

    /**
     * Re crate database
     * Delete all tables and create them again
     * */
    public void resetTables(){
        SQLiteDatabase db = this.getWritableDatabase();
        // Delete All Rows
        db.delete(TABLE_LOGIN, null, null);
        db.close();
    }

}

Answer 1

错误信息

table login has no column named uid

表示您的数据库未处于您期望的状态。您确实使用名为 uid (KEY_UID) 的列创建了该表，但您很可能是在设备上创建数据库之后添加该列。一旦创建，它将一直存在，直到您明确删除该文件或卸载您的应用程序。并且onCreate不会再次执行，直到数据库文件丢失。

每次更改表定义时，您需要升级数据库版本。这将触发 onUpgrade 代码，然后该代码将按照您定义的方式重新创建表。

您的修复很可能只是

private static final int DATABASE_VERSION = 2;