Question

我在编辑时更新记录时遇到问题。我认为它在DatabaseHandler上，因为我不知道如何更新数据库的正确代码。有人可以帮我解决这个问题吗？

btn_Update.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        String ReportCode = tv_Code.getText().toString();

        //Casting and conversion for district code
        String District = spn_District.getSelectedItem().toString();
        Cursor rDistrict = databaseHandler.getReport_DistrictCode(District);
        String DistrictCode = rDistrict.getString(rDistrict.getColumnIndex(Constants.DISTRICT_CODE));

        //Casting and conversion for province id
        String Province = spn_Province.getSelectedItem().toString();
        Cursor rProvince = databaseHandler.getReport_ProvinceId(Province);
        String ProvinceCode = rProvince.getString(rProvince.getColumnIndex(Constants.PROVINCE_ID));

        //Casting and conversion for InfoType id
        String InfoType = spn_InfoType.getSelectedItem().toString();
        Cursor rInfoType = databaseHandler.getReport_InfoTypeCode(InfoType);
        String InfoTypeCode = rInfoType.getString(rInfoType.getColumnIndex(Constants.INFORMATIONTYPE_CODE));

        int IsCompetitor = chkString;
        String DateObserved = txt_Date.getText().toString();
        String Remarks = txt_Remarks.getText().toString();

        //UPDATE IREPORT
        databaseHandler.UpdateReport(new Cons_iReport (ReportCode, InfoTypeCode, DistrictCode, ProvinceCode, DateObserved, IsCompetitor, Remarks));
        Toast.makeText(getApplicationContext(), "UPDATE!", Toast.LENGTH_SHORT).show();

    }
});

DatabaseHandler.java

public void UpdateReport(Cons_iReport save){
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(Constants.REPORT_CODE, save.getReportCode()); // Save Report Code
    values.put(Constants.REPORT_DISTRICTCODE, save.getDistrict()); // Save District
    values.put(Constants.REPORT_PROVINCECODE, save.getProvince()); // Save Province
    values.put(Constants.REPORT_ISCOMPETITOR, save.getCompetitor()); // Save isCompetitor
    values.put(Constants.REPORT_INFOTYPECODE, save.getInfoType()); // Save infoType
    values.put(Constants.REPORT_DATEOBSERVED, save.getDateObserved()); // Save Date Observed
    values.put(Constants.REPORT_REMARKS, save.getRemarks()); // Save Remarks

    db.update(Constants.TABLE_REPORT, values, Constants.REPORT_CODE+" = ?", null);
    db.close(); 
}

Answer 1

您的whereArgs是null

db.update(Constants.TABLE_REPORT, values, Constants.REPORT_CODE+" = ?", null);

http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html#update(java.lang.String, android.content.ContentValues, java.lang.String, java.lang.String[])

您需要提供它们，否则它将找不到任何要更新的记录。

它相当于说“更新Constants.REPORT_CODE等于......没有的记录”。您需要告诉它要更新的REPORT_CODE。

不在Android中的SQLite中更新表中的记录

1 个答案: