java - 如何清理 SQLite 并设置默认值？

Question

这是教我构建 SQLite 数据库的方法，但我觉得应该有更简单的方法。我的大部分列总是以相同的默认值开头，所以有没有办法在我创建表时设置默认值。

public class SQLiteTable {

public static final String KEY_ROWID = "_id";
public static final String KEY_LEVEL = "level";
public static final String KEY_HEALTH = "health";
public static final String KEY_NAME = "name";
public static final String KEY_CRIT = "crit";
public static final String KEY_CRIT_RANGE = "crit_range";
public static final String KEY_CRIT_INC = "crit_increment";
public static final String KEY_HIT_RANGE = "hit_range";
public static final String KEY_HIT_INC = "hit_increment";
public static final String KEY_CHAR_IMG = "character_image";
public static final String KEY_TOTAL_XP = "total_xp";
public static final String KEY_XP = "xp";
public static final String KEY_XP_NEEDED = "xp_needed";
public static final String KEY_COINS = "coins";
public static final String KEY_SMALL_POTS = "small_pots";
public static final String KEY_LARGE_POTS = "large_pots";

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

private static final String DATABASE_NAME = "Battle For Christams";
private static final String DATABASE_TABLE = "Application Variables";
private static final int DATABASE_VERSION = 1;


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) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
                KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
                KEY_LEVEL + " TEXT NOT NULL, " + 
                KEY_HEALTH + " TEXT NOT NULL, " +
                KEY_NAME + " TEXT NOT NULL, " +
                KEY_CRIT + " TEXT NOT NULL, " +
                KEY_CRIT_RANGE + " TEXT NOT NULL, " +
                KEY_CRIT_INC + " TEXT NOT NULL, " +
                KEY_HIT_RANGE + " TEXT NOT NULL, " +
                KEY_HIT_INC + " TEXT NOT NULL, " +
                KEY_CHAR_IMG + " TEXT NOT NULL, " +
                KEY_TOTAL_XP + " TEXT NOT NULL, " +
                KEY_XP + " TEXT NOT NULL, " +
                KEY_XP_NEEDED + " TEXT NOT NULL, " +
                KEY_COINS + " TEXT NOT NULL, " + 
                KEY_SMALL_POTS + " TEXT NOT NULL, " +
                KEY_LARGE_POTS + " TEXT NOT NULL)"
            );

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXIST " + DATABASE_TABLE);
        onCreate(db);
    }

}

Answer 1

您可以对具有默认值的列使用DEFAULT 子句。你不能吗？有关详细信息，请参阅 this .