使用SQLiteOpenHelper創建多個表可能會導致錯誤？

Question

數據庫處理器代碼：

public class DatabaseHandler extends SQLiteOpenHelper { 

private static final String DATABASE_NAME = "mydb"; 

// 1st table -------------------------------------- 
private static final String TABLE_MODULE = "module";  
// Module table columns 
private static final String KEY_MODULE_CODE = "code"; 
private static final String KEY_MODULE_TITLE = "title"; 
private static final String KEY_MODULE_SEMESTER = "semester"; 
private static final String KEY_MODULE_TIMETABLE= "timetable"; 


// 2nd table -------------------------------------- 
private static final String TABLE_URIS = "applicationURLs"; 
// Module table columns 
private static final String KEY_SERVER_URI = "serverURI"; 
private static final String KEY_NEWS_URI = "newsURI"; 
private static final String KEY_MODULES_URI= "moduleURI"; 

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

/** 
* Creating tables 
*/ 
@Override 
public void onCreate(SQLiteDatabase db) { 

     String CREATE_MODULE_TABLE = "CREATE TABLE "+ TABLE_MODULE + "(" 
      + KEY_MODULE_CODE   +" TEXT PRIMARY KEY," 
      + KEY_MODULE_TITLE  +" TEXT," 
      + KEY_MODULE_TIMETABLE +" TEXT," 
      + KEY_MODULE_SEMESTER  +" TEXT);";  

     String CREATE_URIS_TABLE = "CREATE TABLE " + TABLE_URIS + "(" 
      + KEY_SERVER_URI + " TEXT PRIMARY KEY," 
      + KEY_NEWS_URI  + " TEXT," 
      + KEY_MODULES_URI + " TEXT);"; 

     db.execSQL(CREATE_MODULE_TABLE + CREATE_URIS_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_MODULE); 
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_URIS); 
    //Create tables again 
    onCreate(db); 
} 

public void addModule(Module module) { 

    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues values = new ContentValues(); 

    values.put(KEY_MODULE_TITLE, module.getTitle());     
    values.put(KEY_MODULE_CODE, module.getCode()); 
    values.put(KEY_MODULE_TIMETABLE, module.getTimetable()); 
    values.put(KEY_MODULE_SEMESTER, module.getSemester()); 

    db.insert(TABLE_MODULE, null, values); 
    db.close(); // Closing database connection 
} 

/** 
* Adding new server URIs 
* @param uris 
*/ 
public void addURIs(ServerURIs uris){ 

    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues values = new ContentValues(); 

    values.put(KEY_SERVER_URI, uris.getServerURI()); 
    values.put(KEY_NEWS_URI, uris.getNewsURI());   
    values.put(KEY_MODULES_URI, uris.getModulesURI()); 

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

Uppon添加新的記錄到第二個表引發錯誤說，第二個表不存在。在的onCreate（活動代碼），將數據添加到數據庫中：

DatabaseHandler dbh = new DatabaseHandler(this); 
dbh.addURIs(serverURLs); 

不知道是什麼原因。先謝謝你。

Answer 1

您不能在一個調用中執行多個語句，只需使用兩個。

db.execSQL(CREATE_MODULE_TABLE); 
db.execSQL(CREATE_URIS_TABLE);  

引述SQLiteDatabase的execSQL(String sql) documentation：

參數
SQL - 要執行的SQL語句。不支持用分號分隔的多個語句。