SQLiteConstraintException：REAL 字段上的 NOT NULL 约束失败

Question

我收到了一段通常有效的代码的崩溃报告。

异常在insertOrThrow中启动，是："Exception android.database.sqlite.SQLiteConstraintException: NOT NULL constraint failed: HISTORY.altitude (code 1299)".

所有字段在 Table 中声明为 NOT NULL，特别是 HISTORY.altitude 字段声明为 "REAL NOT NULL"

我不明白它怎么可能是 NULL，因为我在插入命令中填了几行。

有人知道这是怎么可能的吗？

synchronized public void addSample( long time, int method, float altitude, int accuracy )
{
    ...
        ContentValues cv = new ContentValues();

        long day = new TimeUtils.Day(time).getMillis();
        cv.put(MetaData.COLUMN_DAY, day);
        cv.put(MetaData.COLUMN_TIME, time);
        cv.put(MetaData.COLUMN_ALTITUDE, altitude);
        cv.put(MetaData.COLUMN_METHOD, method);
        cv.put(MetaData.COLUMN_ACCURACY, accuracy);

        long id = latestSample.mId;
        id = mDb.insertOrThrow(MetaData.TABLE_NAME, null, cv);  // <--- Here crash
    ...
}

这里的代码用来定义table:

/* Inner class that defines the table contents */
public static abstract class MetaData implements BaseColumns
{
    public static final String TABLE_NAME = "HISTORY";
    public static final String COLUMN_DAY = "day";
    public static final String COLUMN_TIME = "time";
    public static final String COLUMN_ALTITUDE = "altitude";
    public static final String COLUMN_METHOD = "method";
    public static final String COLUMN_ACCURACY = "accuracy";
}

private static final String SQL_CREATE_HISTORY_TABLE =
        "CREATE TABLE " + MetaData.TABLE_NAME + " ( " +
                MetaData._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                MetaData.COLUMN_DAY + " INTEGER NOT NULL, " +
                MetaData.COLUMN_TIME + " INTEGER NOT NULL, " +
                MetaData.COLUMN_ALTITUDE + " REAL NOT NULL, " +
                MetaData.COLUMN_METHOD + " INTEGER NOT NULL, " +
                MetaData.COLUMN_ACCURACY + " INTEGER NOT NULL " +
                " );\n" +
        "CREATE INDEX " + MetaData.COLUMN_METHOD + " ON " + MetaData.TABLE_NAME + " (" + MetaData.COLUMN_METHOD + ");\n" +
        "CREATE INDEX " + MetaData.COLUMN_DAY + " ON " + MetaData.TABLE_NAME + " (" + MetaData.COLUMN_DAY + ");\n" +
        "CREATE INDEX " + MetaData.COLUMN_TIME + " ON " + MetaData.TABLE_NAME + " (" + MetaData.COLUMN_TIME + ");";

Answer 1

SQLite 不允许 NaN 的浮点值，并将它们视为 NULL。因此，如果您的 float 值最终以某种方式成为 NaN，它将违反 NOT NULL 约束。

SQLiteConstraintException：REAL 字段上的 NOT NULL 约束失败

SQLiteConstraintException: NOT NULL constraint failed on a REAL field

sqlite

null

android

nan

android-sqlite