android中的sqlite無法創建表格

Question

下面顯示的代碼嘗試創建表格並定義用於向表格中輸入數據的功能。

public class Showtime extends SQLiteOpenHelper { 


private static final int DATABASE_VERSION = 1; 

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

// Crew table name 
private static final String TABLE_CREW = "crew"; 

// Crew Table Columns names 
private static final String KEY_ID = "id"; 
private static final String KEY_CAST = "cast"; 
private static final String KEY_PRODUCER = "producer"; 
private static final String KEY_WRITER = "writer"; 
private static final String KEY_DIRECTOR = "director"; 

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


    @Override 
    public void onCreate(SQLiteDatabase db) { 
     String CREATE_CREW_TABLE = "CREATE TABLE" + TABLE_CREW + "(" 
     + KEY_ID + "INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_CAST + "TEXT," 
     + KEY_WRITER + "TEXT," + KEY_DIRECTOR + "TEXT," + KEY_PRODUCER + "TEXT" +")"; 
     db.execSQL(CREATE_CREW_TABLE); 
    } 

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

     // Create tables again 
     onCreate(db); 
    } 

    public void addCrew(Crew crew) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_CAST, crew.getCast()); // actors or cast 
     values.put(KEY_WRITER, crew.getWriters()); // writers name list 
     values.put(KEY_DIRECTOR, crew.getDirectors()); // directors name list 
     values.put(KEY_PRODUCER, crew.getProducers()); // producers name list 
       // Inserting Row 

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

我嘗試將數據插入到上面使用下面的代碼顯示創建表：

public class MainActivity extends Activity { 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.showtime); 

    Showtime db = new Showtime(this); 

    /** 
    * CRUD Operations 
    * */ 
    // Inserting Crews 

    Log.d("Insert: ", "Inserting .."); 
    //Crew (String _cast , String _writers ,String _directors , String _producers) 
    db.addCrew(new Crew("tom hanks","Billy Ray","Paul Greengrass" ,"Michael De Luca")); 

但我收到此錯誤：

02-12 13:24:49.855: D/Insert:(1450): Inserting .. 
    02-12 13:24:49.903: E/SQLiteLog(1450): (1) table crew has no column named producer 
    02-12 13:24:49.907: E/SQLiteDatabase(1450): Error inserting producer=Michael De Luca director=Billy Ray writer=Billy Ray cast=tom hanks 
    02-12 13:24:49.907: E/SQLiteDatabase(1450): android.database.sqlite.SQLiteException: table crew has no column named producer (code 1): , while compiling: INSERT INTO crew(producer,director,writer,cast) VALUES (?,?,?,?) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at com.example.test.Showtime.addCrew(Showtime.java:61) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at com.example.test.MainActivity.onCreate(MainActivity.java:24) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.app.Activity.performCreate(Activity.java:5133) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.os.Handler.dispatchMessage(Handler.java:99) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.os.Looper.loop(Looper.java:137) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at java.lang.reflect.Method.invoke(Method.java:525) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
02-12 13:24:49.907: E/SQLiteDatabase(1450):  at dalvik.system.NativeStart.main(Native Method) 
02-12 13:24:49.915: D/Reading:(1450): Reading all contacts.. 
02-12 13:24:50.127: D/libEGL(1450): loaded /system/lib/egl/libEGL_genymotion.so 
02-12 13:24:50.167: D/(1450): HostConnection::get() New Host Connection established 0xb7dddf98, tid 1450 
02-12 13:24:50.215: D/libEGL(1450): loaded /system/lib/egl/libGLESv1_CM_genymotion.so 
02-12 13:24:50.219: D/libEGL(1450): loaded /system/lib/egl/libGLESv2_genymotion.so 
02-12 13:24:50.539: W/EGL_genymotion(1450): eglSurfaceAttrib not implemented 
02-12 13:24:50.543: E/OpenGLRenderer(1450): Getting MAX_TEXTURE_SIZE from GradienCache 
02-12 13:24:50.567: E/OpenGLRenderer(1450): Getting MAX_TEXTURE_SIZE from Caches::initConstraints() 
02-12 13:24:50.567: D/OpenGLRenderer(1450): Enabling debug mode 0 
02-12 13:24:50.607: D/dalvikvm(1450): GC_FOR_ALLOC freed 161K, 24% free 2811K/3688K, paused 14ms, total 17ms 
    Thank you for your help! 

Answer 1

您需要的列名之間的空格和類型，以及SQL關鍵字和標識符之間的關係（TABLE，表名稱）。

變化

String CREATE_CREW_TABLE = "CREATE TABLE" + TABLE_CREW + "(" 
    + KEY_ID + "INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_CAST + "TEXT," 
    + KEY_WRITER + "TEXT," + KEY_DIRECTOR + "TEXT," + KEY_PRODUCER + "TEXT" +")"; 

到

String CREATE_CREW_TABLE = "CREATE TABLE " + TABLE_CREW + "(" 
    + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_CAST + " TEXT," 
    + KEY_WRITER + " TEXT," + KEY_DIRECTOR + " TEXT," + KEY_PRODUCER + " TEXT" +")"; 

編輯表架構後，使舊的數據庫文件被刪除，onCreate()再次運行卸載應用程序。

Answer 2

試試這個：

String CREATE_CREW_TABLE = "CREATE TABLE" + TABLE_CREW + "(" 
    + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_CAST + " TEXT," 
    + KEY_WRITER + " TEXT," + KEY_DIRECTOR + " TEXT," + KEY_PRODUCER + " TEXT" +")"; 

您書面查詢走錯了路。您需要在列類型和名稱之間添加空格。