sqlite的为Android，如何更新表

Question

我发现了一些处理这个堆栈溢出的联系，但没有任何解决方案都使这里为我工作得好：

我试图添加一列举行日期（并且可能需要在将来添加时间列），但自从表已经创建以来遇到了一些麻烦。这里是数据库代码：

public class MyDatabase { 

public static final String KEY_ROWID = "_id"; 
public static final String KEY_DATE = "Date"; 
public static final String KEY_SYS = "Systolic"; 
public static final String KEY_DIA = "Diastolic"; 

private static final String DATABASE_NAME = "Blood Pressures";//Used to reference database 
private static final String DATABASE_TABLE = "bloodPressureTable";//Tables can be stored in database 
// this will be used to store ID, date, systolic and diastolic 
private static final int DATABASE_VERSION = 9; 

private DbHelper ourHelper; 
private final Context ourContext; 
private SQLiteDatabase ourDatabase; 

public String getData() { 
    String[] columns = new String[]{KEY_ROWID, KEY_SYS, KEY_DIA}; 
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null); 
    String result = ""; 

    int iRow = c.getColumnIndex(KEY_ROWID); 
    int iSys = c.getColumnIndex(KEY_SYS); 
    int iDia = c.getColumnIndex(KEY_DIA); 

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { //if cursor is after position of our last entry, then stop 
     result = result + c.getString(iRow) +  //get ROW_ID column, get name of first row and hotness, create new string 
       " " + c.getString(iSys) + " " + 
       c.getString(iDia) + "\n"; 
    } 

    return result; 
} 

private static class DbHelper extends SQLiteOpenHelper { 

    public DbHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     //TODO Auto-generated constructor stub 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { //This is only called when we first create a database 
     // when then we will just cycle through onUpgrade, passes a database in 
     db.execSQL(
       "CREATE TABLE " + DATABASE_TABLE + " (" + //create a table called table name 
         //adds columns inside parenthesise 
         KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + //integer increment automatically, referenced by keyID 
         KEY_DATE + "TEXT NOT NULL, " + //SQL uses the word text rather than string 
         KEY_SYS + " INTEGER, " + 
         KEY_DIA + " INTEGER);" 
     ); 
    } 

    @Override //called if oncreate has already been called 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 


     //db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE); //If table name exists it is going 
     // to drop it and then all we have to do is call our onCreate method 
     //Removes table added by create table statement 
     //onCreate(db); 

     if (newVersion > oldVersion) { 
      db.execSQL("ALTER TABLE " + DATABASE_TABLE + 
      " ADD COLUMN " + KEY_DATE + " TEXT NOT NULL, "); 
     } 

    } 
} 

//Constructor below 
public MyDatabase(Context c) { 
    ourContext = c; 
} 
//open() allows us to open and write to database 

public MyDatabase open() { 
    ourHelper = new DbHelper(ourContext); // this is a new instance of that object passing in the context 
    ourDatabase = ourHelper.getWritableDatabase();//here we set up our database, 
    // getting the writeable database. This will open up our database through our helper 
    return this; 
} 

public void close() { 
    ourHelper.close(); //close our SQLiteOpenHelper 

} 

public long createEntry(int systolic, int diastolic) { 
    ContentValues cv = new ContentValues(); 
    Calendar c = Calendar.getInstance(); 
    String s = Integer.toString(c.get(Calendar.DAY_OF_MONTH)) + "/" + Integer.toString(c.get(Calendar.MONTH)) + 
      "/" + Integer.toString(c.get(Calendar.YEAR)); 

    cv.put(KEY_DATE, s); 
    cv.put(KEY_SYS, systolic); 
    cv.put(KEY_DIA, diastolic);//Put the string in KEY_NAME column? 
    return ourDatabase.insert(DATABASE_TABLE, null, cv); //we want this method to return this line 
} 
} 

有人可以告诉我的解决方案吗？正如你所看到的，我尝试了两种不同的方法（其中一个在onUpgrade中被注释掉了）。正如你可以看到我在版本10上已经玩过它了！

这里是logcat的：

03-02 16:03:48.416 1811-1811/com.dissertation.michael.biolog E/SQLiteLog﹕ (1) Cannot add a NOT NULL column with default value NULL 
03-02 16:03:48.416 1811-1811/com.dissertation.michael.biolog D/AndroidRuntime﹕ Shutting down VM 
03-02 16:03:48.416 1811-1811/com.dissertation.michael.biolog W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41696bd8) 
03-02 16:03:48.416 1811-1811/com.dissertation.michael.biolog E/AndroidRuntime﹕ FATAL EXCEPTION: main 
Process: com.dissertation.michael.biolog, PID: 1811 
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1111, result=-1, data=Intent { (has extras) }} to activity {com.dissertation.michael.biolog/com.dissertation.michael.biolog.MainActivity}: android.database.sqlite.SQLiteException: Cannot add a NOT NULL column with default value NULL (code 1): , while compiling: ALTER TABLE bloodPressureTable ADD COLUMN DateTEXT NOT NULL 
     at android.app.ActivityThread.deliverResults(ActivityThread.java:3391) 
     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3434) 
     at android.app.ActivityThread.access$1300(ActivityThread.java:138) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:149) 
     at android.app.ActivityThread.main(ActivityThread.java:5045) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
     at dalvik.system.NativeStart.main(Native Method) 
Caused by: android.database.sqlite.SQLiteException: Cannot add a NOT NULL column with default value NULL (code 1): , while compiling: ALTER TABLE bloodPressureTable ADD COLUMN DateTEXT NOT NULL 
     at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
     at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) 
     at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) 
     at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
     at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
     at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 
     at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1672) 
     at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603) 
     at com.dissertation.michael.biolog.MyDatabase$DbHelper.onUpgrade(MyDatabase.java:75) 
     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:257) 
     at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 
     at com.dissertation.michael.biolog.MyDatabase.open(MyDatabase.java:90) 
     at com.dissertation.michael.biolog.MainActivity.onActivityResult(MainActivity.java:170) 
     at android.app.Activity.dispatchActivityResult(Activity.java:5430) 
     at android.app.ActivityThread.deliverResults(ActivityThread.java:3387) 
    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3434) 
    at android.app.ActivityThread.access$1300(ActivityThread.java:138) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:149) 
at android.app.ActivityThread.main(ActivityThread.java:5045) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:515) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
at dalvik.system.NativeStart.main(Native Method) 
03-02 16:03:48.424 1811-1811/com.dissertation.michael.biolog I/Process: Sending signal. PID: 1811 SIG: 9 

可选地（且优选地，如果它是简单）删除完全使得版本1被再次创建将是理想的我的表的方法。 （此时没有有用的数据输入到数据库中）......干杯！

Answer 1

由于java.lang.NumberFormatException: Invalid int: "300-400"，您的应用程序崩溃，这意味着您传递无效格式的INTEGER，并且300-400不是有效的int。

P.S.如果你想进入300-400到数据库列中使用TEXT或VARCHAR(15)为你列的数据类型