的Android SQLite的錯誤：sqlite的返回：錯誤碼= 1，味精=近 「TABLEusers」：語法錯誤，

Question

登錄分類，在使用我的數據庫：

package edu.flying.panda.taskmanager; 


import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 

/** 
* Login Screen 
* @author FlyingPanda 
*/ 

public class LogIn extends Activity { 

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.log_in); 

    final DatabaseHandler userDB = new DatabaseHandler(this); 

    final Button logIn_button = (Button) findViewById(R.id.log_in_logIn_button); 
    final Button signUp_button = (Button) findViewById(R.id.log_in_register_button); 

    /** 
    * Listener for LogIn button, checks for correct Username/Password and handles errors 
    */ 
    logIn_button.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 

      EditText username = (EditText) findViewById(R.id.log_in_username); 
      EditText password = (EditText) findViewById(R.id.log_in_pass); 
      TextView errorText = (TextView) findViewById(R.id.log_in_error); 


      //check credentials 

      User user = userDB.getUser(username.getText().toString()); 
      //error^ 
      Log.d("cc", "user is found"); 
      if (user!=null){ 
       Log.d("cc", "user is not null"); 
       if (user.getPassword().equals(password)){ 
        Log.d("cc", "pass correct"); 

       }else { 
        errorText.setText("Username/Password incorrect"); 
       } 
      } 
     } 
    }); 



} 

我databaseHelper類，它使用SQLite

package edu.flying.panda.taskmanager; 

import java.util.ArrayList; 
import java.util.List; 

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{ 

    //db version 
    private static final int DATABASE_VERSION = 1; 
    //db name 
    private static final String DATABASE_NAME = "userManager"; 
    //table name 
    private static final String TABLE_USERS = "users"; 
    //user table column names 
    private static final String KEY_ID = "id"; 
    private static final String KEY_USERNAME = "username"; 
    private static final String KEY_PASSWORD = "password"; 
    private static final String KEY_NAME = "name"; 
    private static final String KEY_EMAIL = "email"; 
    //constructor 
    public DatabaseHandler(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    }  
    // Creating Tables 
    @Override 
    public void onCreate(SQLiteDatabase db) { 
     String CREATE_USERS_TABLE = "CREATE TABLE" + TABLE_USERS + "(" + KEY_ID + 
       "INTEGER PRIMARY KEY," + KEY_USERNAME + "TEXT," + KEY_PASSWORD + "TEXT," 
       + KEY_NAME + "TEXT," + KEY_EMAIL + "TEXT" + ")"; 

     db.execSQL(CREATE_USERS_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_USERS); 

     // Create tables again 
     onCreate(db); 
    } 
    public void addUser(User user){ 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_USERNAME, user.getUsername()); 
     values.put(KEY_PASSWORD, user.getPassword()); 
     values.put(KEY_NAME, user.getName()); 
     values.put(KEY_EMAIL, user.getEmail()); 

     //inserting row 
     db.insert(TABLE_USERS, null, values); 
     db.close(); 
    } 
    //get user by id 
    public User getUser(int id){ 
     SQLiteDatabase db = this.getReadableDatabase(); 

     //cursor returned will only be one row of the table, with the matching id 
     Cursor cursor = db.query(TABLE_USERS, 
       new String[]{KEY_ID, KEY_USERNAME, KEY_PASSWORD, KEY_NAME, KEY_EMAIL}, 
       KEY_ID + "=?", new String[]{String.valueOf(id)}, null, null, null, null); 

     if (cursor !=null) cursor.moveToFirst(); 

     User user = new User(Integer.parseInt(cursor.getString(0)),cursor.getString(1),cursor.getString(2),cursor.getString(3), cursor.getString(4)); 

     return user; 

    } 
    public User getUser(String username){ 
     SQLiteDatabase db = this.getReadableDatabase(); 

     //cursor returned will only be one row of the table, with the matching id 
     Cursor cursor = db.query(TABLE_USERS, 
       new String[]{KEY_ID, KEY_USERNAME , KEY_PASSWORD, KEY_NAME, KEY_EMAIL}, 
       KEY_USERNAME + "=?", new String[]{username}, null, null, null, null); 

     if (cursor !=null) cursor.moveToFirst(); 

     User user = new User(Integer.parseInt(cursor.getString(0)),cursor.getString(1),cursor.getString(2),cursor.getString(3), cursor.getString(4)); 

     return user; 

    } 
    public List<User> getAllUsers(){ 
     List<User> userList = new ArrayList<User>(); 

     //select all query 
     String selectQuery = "SELECT * FROM " + TABLE_USERS; 

     SQLiteDatabase db = this.getReadableDatabase(); 
     //just a cursor that points to the user table TABLE_USERS 
     Cursor cursor = db.rawQuery(selectQuery, null); 

     //adding users to list 
     if(cursor.moveToFirst()){ 
      do{ 
       User user = new User(); 
       user.setId(Integer.parseInt(cursor.getString(0))); 
       user.setUsername(cursor.getString(1)); 
       user.setPassword(cursor.getString(2)); 
       user.setName(cursor.getString(3)); 
       user.setEmail(cursor.getString(4)); 

       userList.add(user); 
      }while(cursor.moveToNext()); 
     } 

     return userList; 
    } 

的logcat：

03-31 22:26:33.613: I/SqliteDatabaseCpp(538): sqlite returned: error code = 1, msg = near "TABLEusers": syntax error, db=/data/data/edu.flying.panda.taskmanager/databases/userManager 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): Couldn't open userManager for writing (will try read-only): 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): android.database.sqlite.SQLiteException: near "TABLEusers": syntax error: , while compiling: CREATE TABLEusers(idINTEGER PRIMARY KEY,usernameTEXT,passwordTEXT,nameTEXT,emailTEXT) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:134) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteStatement.acquireAndLock(SQLiteStatement.java:260) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:84) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1899) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1839) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at edu.flying.panda.taskmanager.DatabaseHandler.onCreate(DatabaseHandler.java:37) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:165) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:231) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at edu.flying.panda.taskmanager.DatabaseHandler.getUser(DatabaseHandler.java:78) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at edu.flying.panda.taskmanager.LogIn$1.onClick(LogIn.java:55) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.view.View.performClick(View.java:3511) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.view.View$PerformClick.run(View.java:14105) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.os.Handler.handleCallback(Handler.java:605) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.os.Handler.dispatchMessage(Handler.java:92) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.os.Looper.loop(Looper.java:137) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at android.app.ActivityThread.main(ActivityThread.java:4424) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at java.lang.reflect.Method.invokeNative(Native Method) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at java.lang.reflect.Method.invoke(Method.java:511) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
03-31 22:26:33.653: E/SQLiteOpenHelper(538): at dalvik.system.NativeStart.main(Native Method) 
03-31 22:26:33.683: D/AndroidRuntime(538): Shutting down VM 
03-31 22:26:33.683: W/dalvikvm(538): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 
03-31 22:26:33.713: E/AndroidRuntime(538): FATAL EXCEPTION: main 
03-31 22:26:33.713: E/AndroidRuntime(538): android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 1: /data/data/edu.flying.panda.taskmanager/databases/userManager 
03-31 22:26:33.713: E/AndroidRuntime(538): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:244) 
03-31 22:26:33.713: E/AndroidRuntime(538): at edu.flying.panda.taskmanager.DatabaseHandler.getUser(DatabaseHandler.java:78) 
03-31 22:26:33.713: E/AndroidRuntime(538): at edu.flying.panda.taskmanager.LogIn$1.onClick(LogIn.java:55) 
03-31 22:26:33.713: E/AndroidRuntime(538): at android.view.View.performClick(View.java:3511) 
03-31 22:26:33.713: E/AndroidRuntime(538): at android.view.View$PerformClick.run(View.java:14105) 
03-31 22:26:33.713: E/AndroidRuntime(538): at android.os.Handler.handleCallback(Handler.java:605) 
03-31 22:26:33.713: E/AndroidRuntime(538): at android.os.Handler.dispatchMessage(Handler.java:92) 
03-31 22:26:33.713: E/AndroidRuntime(538): at android.os.Looper.loop(Looper.java:137) 
03-31 22:26:33.713: E/AndroidRuntime(538): at android.app.ActivityThread.main(ActivityThread.java:4424) 
03-31 22:26:33.713: E/AndroidRuntime(538): at java.lang.reflect.Method.invokeNative(Native Method) 
03-31 22:26:33.713: E/AndroidRuntime(538): at java.lang.reflect.Method.invoke(Method.java:511) 
03-31 22:26:33.713: E/AndroidRuntime(538): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
03-31 22:26:33.713: E/AndroidRuntime(538): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
03-31 22:26:33.713: E/AndroidRuntime(538): at dalvik.system.NativeStart.main(Native Method) 

我用logcat的檢查程序在多大程度上得到了它達到了錯誤之前。 我在註釋失敗的代碼行下注釋了//錯誤^。

那行代碼是：User user = userDB.getUser（username.getText（）。toString（））;

我對SQLite相當陌生，所以這個語法錯誤真的讓我失望。

我在想如何創建我的表的問題。但我不知道。 感謝您的幫助。

Answer 1

您需要在您創建表查詢適當間距：

String CREATE_USERS_TABLE = "CREATE TABLE " + TABLE_USERS + "(" + KEY_ID + 
" INTEGER PRIMARY KEY," + KEY_USERNAME + " TEXT," + KEY_PASSWORD + " TEXT," 
+ KEY_NAME + " TEXT," + KEY_EMAIL + " TEXT" + ");"; 

爲了更好地使用，它是很好的使用String.format：

String query = String.format("CREATE TABLE %s (%s INTEGER PRIMARY KEY, 
%s TEXT, %s TEXT, %s TEXT, %s TEXT);", TABLE_USERS, KEY_ID, KEY_USERNAME, 
KEY_PASSWORD, KEY_NAME, KEY_EMAIL);