Android SQLiteException near"<&引用;同时删除查询
我正在尝试从SQLite数据库中删除几行,如下所示:Android SQLiteException near"<&引用;同时删除查询,android,sqlite,android-sqlite,where-clause,Android,Sqlite,Android Sqlite,Where Clause,我正在尝试从SQLite数据库中删除几行,如下所示: dbUtilsObj.delete(EngineUtiReport.TABLE_NAME, EngineUtiReport.Columns.KEY_ENGINE_UTI_UNIX_TIME + DBUtils.IS_LESS_THAN, new String[] { String.valueOf(nDaysOldUnixTime) }); DELETE FROM engine_utilization_report WHER
dbUtilsObj.delete(EngineUtiReport.TABLE_NAME,
EngineUtiReport.Columns.KEY_ENGINE_UTI_UNIX_TIME + DBUtils.IS_LESS_THAN,
new String[] { String.valueOf(nDaysOldUnixTime) });
DELETE FROM engine_utilization_report WHERE unix_time < ?
在上述代码中,nDayOldTimeInMills=1429963811949
和DBUtils.IS_小于=”
但是我得到了这个语法错误异常,我就是不知道我做错了什么:
android.database.sqlite.SQLiteException: near "<": syntax error (code 1): ,
while compiling: DELETE FROM engine_utilization_report WHERE unix_time <
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1113)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:686)
android.database.sqlite.SQLiteException:near“您可以尝试以下方法:
dbUtilsObj.delete(EngineUtiReport.TABLE_NAME,
EngineUtiReport.Columns.KEY_ENGINE_UTI_UNIX_TIME + DBUtils.IS_LESS_THAN + "?",
new String[] { String.valueOf(nDaysOldUnixTime) });
dbUtilsObj.delete(EngineUtiReport.TABLE_NAME,
EngineUtiReport.Columns.KEY_ENGINE_UTI_UNIX_TIME + DBUtils.IS_LESS_THAN + "?",
new String[] { String.valueOf(nDaysOldUnixTime) });
将参数传递给delete查询时,需要用?
指示该参数应放置在何处。在本例中,该参数位于where子句的末尾。使用参数化查询时,需要指定要将参数插入查询中的位置。可以通过添加<代码>?
参数应该放在哪里。现在看一下异常中的查询,很明显哪里出了问题:
DELETE FROM engine_utilization_report WHERE unix_time <
要修复错误,只需在where子句末尾添加?
,如下所示:
dbUtilsObj.delete(EngineUtiReport.TABLE_NAME,
EngineUtiReport.Columns.KEY_ENGINE_UTI_UNIX_TIME + DBUtils.IS_LESS_THAN,
new String[] { String.valueOf(nDaysOldUnixTime) });
DELETE FROM engine_utilization_report WHERE unix_time < ?