继承SQLiteOpenHelper类后,实现其中的onUpgrade 方法
@Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { //遍历所有版本 //定义每个版本更新内容 for (int j = oldVersion + 1; j <= newVersion; j++) { switch (j) { case 2: case 3: case 4: case 5: for (String sql : userTableList) { db.execSQL(sql, new String[]{}); } break; case 6: //添加 CODE 字段 String sql = "ALTER TABLE " + DBConfig.TABLE_NAME + " ADD CODE VARCHAR(255);"; db.execSQL(sql, new String[]{}); break; default: break; } } }