SQLiteException：尝试将对象添加到表时没有这样的表答案

【问题标题】：SQLiteException: no such table when trying to add an Object to a tableSQLiteException：尝试将对象添加到表时没有这样的表
【发布时间】：2016-03-01 19:53:50
【问题描述】：

我搜索了 StackOverFlow 并没有找到解决问题的方法。

SQLite Exception: no such table Error

No Such Table error

Android SQLite "no such table" exception

我的数据库代码：

package com.example.mylifeinformationsharedsocial;

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

public class MyUsersDatabase extends SQLiteOpenHelper
{
    private static final int DATABASE_VERSION = 7;
    private static final String DATABASE_NAME = "usersDatabase.db"; // Name of the file i save on the device
    private static final String TABLE_NAME = "usersTable"; // Name of the table

    // User columns
     private static final String UID = "_id"; // User identification number column
     private static final String FIRST_NAME = "firstName"; // User first name column
     private static final String LAST_NAME = "lastName"; // User last name column

     private static final String CREATE_TABLE = "CREATE TABLE " + MyUsersDatabase.DATABASE_NAME + " ( " 
    + UID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
    + MyUsersDatabase.FIRST_NAME + " TEXT, " 
    + MyUsersDatabase.LAST_NAME + " TEXT" + ");";

    private static final String DROP_TABLE = "DROP TABLE IF EXIST " + TABLE_NAME;

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

    // Creating tables
    @Override
    public void onCreate(SQLiteDatabase db) 
    {
        try
        {
             db.execSQL(CREATE_TABLE);
        }
        catch (SQLException e)
        {
             e.printStackTrace();
        }
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
    {
        try
        {
            db.execSQL(DROP_TABLE);
            onCreate(db);
            Log.d("OnCreate", "OnCreate called");
        } 
        catch (SQLException e) 
        {
            e.printStackTrace();
        }
    }

    public void addUser(User user) // Add a new row to the users table
    {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues contentValues = new ContentValues();
        contentValues.put(MyUsersDatabase.UID,user.getId()); 
        contentValues.put(MyUsersDatabase.FIRST_NAME,user.getFirstName());      
        contentValues.put(MyUsersDatabase.LAST_NAME,user.getLastName());

       db.insert(MyUsersDatabase.TABLE_NAME, null, contentValues);

       db.close(); // Closing database connection
    }

    public void deleteUser(int userId) // Delete a row from the users table
    {
         SQLiteDatabase db = this.getWritableDatabase();

         db.execSQL("DELTE FROM " + DATABASE_NAME + " WHERE " + UID + "=\"" + userId + "\";");

        db.close(); // Closing database connection
    }

    public User getUser(int userId) 
    {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(MyUsersDatabase.TABLE_NAME, new String[] {MyUsersDatabase.UID,MyUsersDatabase.FIRST_NAME,
                 MyUsersDatabase.LAST_NAME},MyUsersDatabase.UID + "=?",
                 new String[] {String.valueOf(userId)}, null, null, null, null);
            if (cursor != null)
            {
                cursor.moveToFirst();
            }

            User user = new  User(Integer.parseInt(cursor.getString(0)),cursor.getString(1), cursor.getString(2));

            return user;
    }
}

我的对象（用户）类：

package com.example.mylifeinformationsharedsocial;

public class User 
{
    private int _id;
    private String firstName;
    private String lastName;

    public User(int id,String firstName,String lastName)
    {
        this._id = id;
        this.firstName = firstName;
        this.lastName = lastName;
    }
    public User()
    {

    }

    public int getId() 
    {
        return _id;
   }
    public void setId(int id) 
    {
        this._id = id;
    }
    public String getFirstName() 
    {
        return firstName;
    }
    public void setFirstName(String firstName) 
    {
        this.firstName = firstName;
    }
    public String getLastName() 
    {
        return lastName;
    }
    public void setLastName(String lastName) 
    {
        this.lastName = lastName;
    }

    public String toString()
    {
       return "ID - " + this._id + " ,First name - " + this.firstName + " ,Last name - " + this.lastName;
    }
}

我的活动：（我试图在表数据库中添加一行并获取SQLiteException: no such table）

package com.example.mylifeinformationsharedsocial;

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

public class SignUpActivity extends AppCompatActivity
{   
    Button signUpButton;

    EditText firstNameEditText;
    EditText lastNameEditText;
    EditText usernameEditText;
    EditText passwordEditText;
    EditText emailEditText;

    MyUsersDatabase myUsersDatabase;

    String userFirstName;
    String userLastName;

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

        viewsInitialization();

         getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

        myUsersDatabase = new MyUsersDatabase(SignUpActivity.this);

        signUpButton.setOnClickListener(new View.OnClickListener()
        {   
            @Override
            public void onClick(View v) 
            {
                myUsersDatabase.addUser(new User(0,"Dan","Riman")); // Here the exception
               firstNameEditText.setText(myUsersDatabase.getUser(0).toString());
            }
        });
    }


    private void viewsInitialization()
    {
        signUpButton = (Button) findViewById(R.id.sign_up_button_id);

         firstNameEditText = (EditText) findViewById(R.id.sign_up_first_name_edit_text_id);
         lastNameEditText = (EditText) findViewById(R.id.last_name_edit_text_id);
         usernameEditText = (EditText) findViewById(R.id.username_edit_text_id);
        passwordEditText = (EditText) findViewById(R.id.password_edit_text_id);
        emailEditText = (EditText) findViewById(R.id.email_edit_text_id);
    }
}

所以当我执行myUsersDatabase.addUser(new User(0,"Dan","Riman")); 行时，我得到SQLiteException: no such table when trying to add an Object to a table。

LogCat：

11-27 15:51:58.567: E/SQLiteLog(20624): (1) no such table: usersTable
11-27 15:51:58.568: D/AndroidRuntime(20624): Shutting down VM
11-27 15:51:58.569: E/AndroidRuntime(20624): FATAL EXCEPTION: main
11-27 15:51:58.569: E/AndroidRuntime(20624): Process: com.example.mylifeinformationsharedsocial, PID: 20624
11-27 15:51:58.569: E/AndroidRuntime(20624): android.database.sqlite.SQLiteException: no such table: usersTable (code 1):     , while compiling: SELECT _id, firstName, lastName FROM usersTable WHERE _id=?
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConne    ction.java:894)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:505)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:726)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.jav    a:1417)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1    264)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1135)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1341)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at com.example.mylifeinformationsharedsocial.MyUsersDatabase.getUser(MyUsersData    base.java:93)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at com.example.mylifeinformationsharedsocial.SignUpActivity$1.onClick(SignUpActi    vity.java:61)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.view.View.performClick(View.java:4763)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.view.View$PerformClick.run(View.java:19821)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.os.Handler.handleCallback(Handler.java:739)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.os.Handler.dispatchMessage(Handler.java:95)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.os.Looper.loop(Looper.java:135)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at android.app.ActivityThread.main(ActivityThread.java:5274)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at java.lang.reflect.Method.invoke(Native Method)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at java.lang.reflect.Method.invoke(Method.java:372)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:90    9)
11-27 15:51:58.569: E/AndroidRuntime(20624):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)

【问题讨论】：

db.execSQL("DELTE FROM " 应该是 DELETE 而不是 DELTE
@StefanBeike 谢谢。但它现在不是问题:))
@Andremoniy 我怎么知道的？我认为我的 onCreate 方法从未被调用，我不知道为什么。
你我知道。这就是我发表评论但没有答案的原因。
@StefanBeike 知道了。

标签： java android sqlite android-sqlite

【解决方案1】：

private static final String CREATE_TABLE = "CREATE TABLE " + MyUsersDatabase.DATABASE_NAME + " ( "  // it should be Table name not database name
    + UID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
    + MyUsersDatabase.FIRST_NAME + " TEXT, " 
    + MyUsersDatabase.LAST_NAME + " TEXT" + ");";

【讨论】：

【解决方案2】：

您的表创建错误。
而不是

     private static final String CREATE_TABLE = "CREATE TABLE " + MyUsersDatabase.DATABASE_NAME + " ( "

你必须写

     private static final String CREATE_TABLE = "CREATE TABLE " + MyUsersDatabase.TABLE_NAME + " ( "

还有这个

db.execSQL("DELTE FROM " + DATABASE_NAME + " WHERE " + UID + "=\"" + userId + "\";");

必须改成

db.execSQL("DELETE FROM " + TABLE_NAME + " WHERE " + UID + "=\"" + userId + "\";");

【讨论】：

已更改。还是一样的 LogCat。也许我需要升级版本？
是的。每次接触数据库结构时都必须这样做。或者卸载并重新安装您的应用。
还是和LogCat一样的问题。我真的认为我的onCreate() 永远不会被调用。
卸载并重新安装后我得到android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
完成。它的工作。非常感谢您和所有提供帮助的用户:)。

【解决方案3】：

以下行有问题

private static final String CREATE_TABLE = "CREATE TABLE " + MyUsersDatabase.DATABASE_NAME + " ( " + UID +“整数主键自动增量，” + MyUsersDatabase.FIRST_NAME + " TEXT, " + MyUsersDatabase.LAST_NAME + " TEXT" + ");";

在“CREATE TABLE”之后，你给数据库名改成表名

private static final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME + " ( " 
    + UID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
    + MyUsersDatabase.FIRST_NAME + " TEXT, " 
    + MyUsersDatabase.LAST_NAME + " TEXT" + ");";

【讨论】：

【解决方案4】：

您很可能忘记升级数据库。

OnCreate() 不会在您更改数据库版本号时调用。仅当数据库不存在时才调用它。

更改数据库版本号会导致调用OnUpgrade()，您需要在这里编写代码将数据库架构从旧版本更改为新版本。

如果您在数据库已经存在之后将新表添加到您的 onCreate 代码中，但尚未编写执行升级的代码，则该表将永远不存在。

卸载\重新安装您的应用程序（这将删除当前数据库并允许在您的 onCreate 中重新创建它）或编写代码来升级您的架构。

【讨论】：

卸载并重新安装后我得到 android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
这是一个不同的问题，需要一个新问题。
所以我会问。感谢您的帮助。