Question

我正在尝试使用某个表格上的SQLiteDatabase.update更新多行。

执行查询的代码：

public void onJobStart(int fileType) {

    ContentValues cv = new ContentValues();
    cv.put(Contract.Entry.UPLOAD_STATUS, STATUS_READY);

    String whereClause = String.format(
            Locale.US,
            "%s = %d AND %s = %d",
            Contract.Entry.FILE_TYPE,
            fileType,
            Contract.Entry.UPLOAD_STATUS,
            STATUS_CREATED
    );

    int success = mDatabase.update(
            Contract.Entry.TABLE_NAME,
            cv,
            whereClause,
            null
    );

    Log.e(TAG, "success=" + success);

}

创建表及其列：

public class DbHelper extends SQLiteOpenHelper {
    public static final int DATABASE_VERSION = 1;
    public static final String DATABASE_NAME = "cache.db";


    private DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String table = "CREATE TABLE " + Contract.Entry.TABLE_NAME + " ( " +
            Contract.Entry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
            Contract.Entry.UPLOAD_STATUS + " INTEGER, " +
            Contract.Entry.FILE_TYPE + " INTEGER " + ");"

        db.execSQL(table);
    }

    @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + Contract.Entry.TABLE_NAME);
        onCreate(db);
    }
}

public final class Contract {

    public Contract() {}

    public static abstract class Entry implements BaseColumns {
    public static final String TABLE_NAME = "files";
    public static final String UPLOAD_STATUS = "uploadStatus";
    public static final String FILE_TYPE = "fileType";
    }
}

此代码不起作用，我在执行查询后不断获取success=0。这有点奇怪，因为直到昨天，where子句只有一个参数并且它起作用了，即：

String whereClause = String.format(
            Locale.US,
            "%s = %d",
            Contract.Entry.UPLOAD_STATUS,
            STATUS_CREATED
    );

修改还试过这个：

String whereClause = Contract.Entry.FILE_TYPE + " = ? AND " + Contract.Entry.UPLOAD_STATUS + " = ?";
    String[] whereArgs = new String[] {String.valueOf(fileType), String.valueOf(STATUS_CREATED)};
    int success = mDatabase.update(
            Contract.Entry.TABLE_NAME,
            cv,
            whereClause,
            whereArgs
    );

基本上我想更新其状态创建的所有行。几个小时没有在SO中找到解决方案。和谷歌。

有什么想法吗？感谢

Answer 1

我在这部分进行了调查：

"%s = %d AND %s = %d"

试试这个:(他们都需要String才能工作）

"%1$s = %2$s AND %3$s = %4$s"

Answer 2

一切都看起来井然有序。我会仔细检查条件是否匹配表的至少一行。您还可以尝试使用update方法以标准方式绑定参数的以下语句：

    int success = mDatabase.update(
            Contract.Entry.TABLE_NAME,
            cv,
            Contract.Entry.FILE_TYPE + " = ? AND "
                    + Contract.Entry.UPLOAD_STATUS + " = ?",
            new String[]{String.valueOf(fileType),String.valueOf(STATUS_CREATED)}
    );

SQLiteDatabase.update不会影响行

2 个答案: