在Android中不更新SQLite表中的记录

我在编辑记录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。有人能帮我修一下吗

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(); 
}

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您的

wherergs

为

null

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

您需要提供它们，否则它将找不到任何要更新的记录

---

这相当于说“更新Constants.REPORT_CODE等于…nothing的记录”。您需要告诉它要更新的报告代码。

首先检查db.update的返回值。然后，阅读更新文档，查看您的选择是否有缺陷。你的？无法与空参数数组匹配