【发布时间】：2016-04-13 05:02:28
【问题描述】：
我不确定为什么会收到此错误：
java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
我正在为 sqlite 中的这些行获取它：
db_d.setIsFollowingType(c.getInt(c.getColumnIndex(KEY_IS_FOLLOWING_TYPE)));
db_d.setIsFollowerType(c.getInt(c.getColumnIndex(KEY_IS_FOLLOWER_TYPE)));
如果我将它们注释掉，它就可以工作，这就是整个 sqlite 方法：
public List<DatabaseUser> getUsers(int type) {
String whereClause = KEY_IS_FOLLOWING_TYPE + " = ? ";
if(type == 1) {
whereClause = KEY_IS_FOLLOWER_TYPE + " = ? ";
}
List<DatabaseUser> getUsers = new ArrayList<DatabaseUser>();
SQLiteDatabase db = this.getReadableDatabase();
String[] whereArgs = new String[]{
"1"
};
String orderBy = KEY_ID + " DESC";
Cursor c = db.query(TABLE_USERS, null, whereClause, whereArgs, null, null, orderBy);
if (c.moveToFirst()) {
do {
DatabaseUser db_d = new DatabaseUser();
db_d.setUserId(c.getString(c.getColumnIndex(KEY_USER_ID)));
db_d.setPicture(c.getString(c.getColumnIndex(KEY_PICTURE)));
db_d.setUsername(c.getString(c.getColumnIndex(KEY_USERNAME)));
db_d.setFollowersCount(c.getInt(c.getColumnIndex(KEY_FOLLOWERS_COUNT)));
db_d.setFollowingCount(c.getInt(c.getColumnIndex(KEY_FOLLOWING_COUNT)));
db_d.setTrackingCount(c.getInt(c.getColumnIndex(KEY_TRACKING_COUNT)));
db_d.setIsFollowingType(c.getInt(c.getColumnIndex(KEY_IS_FOLLOWING_TYPE)));
db_d.setIsFollowerType(c.getInt(c.getColumnIndex(KEY_IS_FOLLOWER_TYPE)));
db_d.setIsChanged(c.getInt(c.getColumnIndex(KEY_IS_CHANGED)));
db_d.setDateAdded(c.getLong(c.getColumnIndex(KEY_DATE_ADDED)));
Log.d(Constants.DEBUG, "DB pull user product " + db_d);
getUsers.add(db_d);
} while (c.moveToNext());
}
//calling for close for recycling make sure it does not cause an error
c.close();
return getUsers;
}
这是我的表创建方法：
private static final String CREATE_TABLE_USERS = "CREATE TABLE "
+ TABLE_USERS + "("
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ KEY_USER_ID + " TEXT NOT NULL UNIQUE ON CONFLICT REPLACE,"
+ KEY_PICTURE + " TEXT,"
+ KEY_USERNAME + " TEXT,"
+ KEY_FOLLOWERS_COUNT + " INTEGER,"
+ KEY_FOLLOWING_COUNT + " INTEGER,"
+ KEY_TRACKING_COUNT + " INTEGER,"
+ KEY_IS_FOLLOWING_TYPE + " INTEGER,"
+ KEY_IS_FOLLOWER_TYPE + " INTEGER,"
+ KEY_IS_CHANGED + " INTEGER,"
+ KEY_DATE_ADDED + " LONG"
+ ")";
这是 DatabaseUser 对象：
public class DatabaseUser {
private String userId, picture, username;
private int followersCount, followingCount, trackCount, isChanged, isFollowingType, isFollowerType;
private long dateAdded;
//TODO USER NO NEED FOR ISFOLLOWING
public DatabaseUser() {
}
//TODO TESTING
public DatabaseUser(String uId, String pic, String uname,
int followersC, int followingC, int trackC, int isChng, int followingtype, int followertype,
long dateAdd) {
userId = uId;
picture = pic;
username = uname;
followersCount = followersC;
followingCount = followingC;
trackCount = trackC;
isChanged = isChng;
isFollowingType = followingtype;
isFollowerType = followertype;
dateAdded = dateAdd;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getPicture() {
return picture;
}
public void setPicture(String picture) {
this.picture = picture;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public int getFollowersCount() {
return followersCount;
}
public void setFollowersCount(int followersCount) {
this.followersCount = followersCount;
}
public int getFollowingCount() {
return followingCount;
}
public void setFollowingCount(int followingCount) {
this.followingCount = followingCount;
}
public int getTrackingCount() {
return trackCount;
}
public void setTrackingCount(int trackCount) {
this.trackCount = trackCount;
}
public int getIsChanged() {
return isChanged;
}
public void setIsChanged(int isChanged) {
this.isChanged = isChanged;
}
public int getIsFollowingType() {
return isFollowingType;
}
public void setIsFollowingType(int isFollowingType) {
this.isFollowingType = isFollowingType;
}
public long getDateAdded() {
return dateAdded;
}
public void setDateAdded(long dateAdded) {
this.dateAdded = dateAdded;
}
public int getIsFollowerType() {
return isFollowerType;
}
public void setIsFollowerType(int isFollowerType) {
this.isFollowerType = isFollowerType;
}
}
这是我在发生错误的 MainHome Activity 中进行检查的地方：
private void testCreateUserFollowing() {
//0 is for isType following
DatabaseUser testUserFollowing1 = new DatabaseUser("userId1", "pictureId", "username1", 2354, 30534, 498231, 0, 1, 3, 0);
DatabaseUser testUserFollowing2 = new DatabaseUser("userId2", "pictureId", "username2", 2750000, 30000000, 4, 0, 1, 3, 0);
DatabaseUser testUserFollowing3 = new DatabaseUser("userId3", "pictureId", "username3", 2, 3, 4, 0, 1, 3, 0);
DatabaseUser testUserFollower1 = new DatabaseUser("userId4", "pictureId", "username4", 2, 3, 4, 0, 3, 1, 0);
DatabaseUser testUserFollower2 = new DatabaseUser("userId5", "pictureId", "username5", 2, 3, 4, 0, 3, 1, 0);
DatabaseUser testUserFollower3 = new DatabaseUser("userId6", "pictureId", "username6", 2, 3, 4, 0, 3, 1, 0);
DatabaseUser checkUsersExist = db.getSingleUser("userId3");
if(checkUsersExist != null) {
} else {
db.createUser(testUserFollowing1);
db.createUser(testUserFollowing2);
db.createUser(testUserFollowing3);
db.createUser(testUserFollower1);
db.createUser(testUserFollower2);
db.createUser(testUserFollower3);
}
}
注释掉 tee 上面提到的两个字段是可行的，但是我需要它来取消注释它...另外，我意识到其他 sqlite 错误弹出另一个行，另一个表出现相同的错误...如果这对任何事情都有帮助。我在包含 sqlite 方法的 SQLITE Helper 类上没有错误...所以不确定为什么会弹出此错误...
更新：对于任何感兴趣的人： 显然调用 deleteDatabase("dbname");只能工作，卸载或清除应用数据没有...
【问题讨论】：
-
您最近是否将该列添加到您的
CREATE TABLE并且没有升级/擦除现有数据库文件？ -
是的，因为我重新安装了应用程序以清除旧数据库，这是在清除数据库后开始弹出此错误的时间。否则在此之前它工作正常所以不确定，因为已添加 MainHome 类检查存在方法中的测试创建，并且我清除了它开始发生的数据库。
-
添加你的 createUser 方法代码
-
您必须卸载该应用程序并重新安装。由于您处于开发阶段，因此卸载就足够了。如果您要进行版本更改，那么您必须升级您的数据库。