Android 列表大小从sqlite查询返回0

我试图通过连接三个表来查询前提列表。但是，当我添加WHERE时，我的列表返回空。我试着把一切都记录下来。。似乎没有它，我可以得到一个前提列表。。。但这是错误的。我尝试在sqlite的DB Browser上运行查询，它设法运行并返回正确的列表。请帮帮我

这是我的查询码

public List<TXN_Premise> getTxnTableData(String tableName, String columnName) {

        ArrayList<TXN_Premise> itemList = new ArrayList<>();
        String selectQuery = "SELECT "
                + Constants.COLUMN_PREMISE_REF + ", "
                + Constants.COLUMN_PREMISE_NAME + ", "
                + Constants.COLUMN_PREMISE_ADDRESS + ", "
                + Constants.REF_PREMISE_CATEGORY_TABLE + "." + Constants.COLUMN_PREMISE_CATEGORY_ID + " AS " + Constants.COLUMN_FK_PREMISE_CATEGORY_ID +", "
                + Constants.REF_PREMISE_CATEGORY_MASTER_TABLE + "." + Constants.COLUMN_PREMISE_CATEGORY_MASTER_ID + " AS " + Constants.COLUMN_FK_PREMISE_CATEGORY_MASTER_ID + ", "
                + Constants.COLUMN_PREMISE_REG_NO + ", "
                + Constants.COLUMN_PREMISE_REG_DATE + ", "
                + Constants.REF_PREMISE_CATEGORY_TABLE + "." + Constants.COLUMN_DESCRIPTION + " AS premiseCategoryDescription, "
                + Constants.REF_PREMISE_CATEGORY_MASTER_TABLE + "." + Constants.COLUMN_DESCRIPTION + " AS premiseCategoryMasterDescription "

                + " FROM " + tableName

                + " LEFT JOIN " + Constants.REF_PREMISE_CATEGORY_MASTER_TABLE + " ON " +
                Constants.TXN_PREMISE_TABLE + "." + Constants.COLUMN_FK_PREMISE_CATEGORY_MASTER_ID + " = " + Constants.REF_PREMISE_CATEGORY_MASTER_TABLE + "." + Constants.COLUMN_CODE

                + " LEFT JOIN " + Constants.REF_PREMISE_CATEGORY_TABLE + " ON " +
                Constants.TXN_PREMISE_TABLE + "." + Constants.COLUMN_FK_PREMISE_CATEGORY_ID + " = " + Constants.REF_PREMISE_CATEGORY_TABLE + "." + Constants.COLUMN_CODE

//              + " WHERE " + Constants.REF_PREMISE_CATEGORY_TABLE + "." + Constants.COLUMN_LANG + " = 'MYS'"
//              + Constants.REF_PREMISE_CATEGORY_MASTER_TABLE + "." + Constants.COLUMN_LANG + " = 'MYS' AND "
//              + Constants.COLUMN_PREMISE_NAME + " <> '-' AND " + Constants.COLUMN_PREMISE_NAME + " <> '-TIADA-'"

                + " ORDER BY " + columnName + " ASC LIMIT 3";

        Log.d("test", "getTxnTableData: " + selectQuery);

        try {
            open();
            //make sure the database is not empty
            if (sqLiteDatabase != null) {
                //get a cursor for all state in the database
                Cursor cursor = sqLiteDatabase.rawQuery(selectQuery, null);

                Log.d("test", "getTxnTableData: cursor " + cursor.toString());

                Log.d("test", "getTxnTableData: outside");

                if (cursor.moveToFirst()) {
                    while (!cursor.isAfterLast()) {
                        TXN_Premise premiseColumn = new TXN_Premise();
//                      premiseColumn.setPremiseId(cursor.getString(0));
                        premiseColumn.setPremiseRef(cursor.getString(cursor.getColumnIndex(Constants.COLUMN_PREMISE_REF)));
                        premiseColumn.setPremiseName(cursor.getString(cursor.getColumnIndex(Constants.COLUMN_PREMISE_NAME)));
                        premiseColumn.setPremiseAddress(cursor.getString(cursor.getColumnIndex(Constants.COLUMN_PREMISE_ADDRESS)));
                        premiseColumn.setFk_premiseCategoryId(cursor.getString(cursor.getColumnIndex(Constants.COLUMN_FK_PREMISE_CATEGORY_ID)));
                        premiseColumn.setFk_premiseCategoryMasterId(cursor.getString(cursor.getColumnIndex(Constants.COLUMN_FK_PREMISE_CATEGORY_MASTER_ID)));
                        premiseColumn.setPremiseRegNo(cursor.getString(cursor.getColumnIndex(Constants.COLUMN_PREMISE_REG_NO)));
                        premiseColumn.setPremiseRegDate(cursor.getString(cursor.getColumnIndex(Constants.COLUMN_PREMISE_REG_DATE)));


                        //  todo: temp premise category description
                        premiseColumn.setPremiseCategoryName(cursor.getString(cursor.getColumnIndex("premiseCategoryDescription")));
                        premiseColumn.setPremiseCategoryMasterName(cursor.getString(cursor.getColumnIndex("premiseCategoryMasterDescription")));

                        Log.d("test", "getTxnTableData: premiseName " + cursor.getString(cursor.getColumnIndex(Constants.COLUMN_PREMISE_NAME)));

                        //add premiseColumn in the cursor
                        itemList.add(premiseColumn);
                        cursor.moveToNext();
                    }
                }
                cursor.close();
            }
            close();

        } catch (SQLException e) {
            e.printStackTrace();
        }

        Log.d("test", "getTxnTableData: itemlist " + itemList.size() );

        return itemList;
    }

public List getTxnTableData（String tableName，String columnName）{
ArrayList itemList=新建ArrayList（）；
String selectQuery=“选择”
+常数.列_前提_参考+“，”
+Constants.COLUMN_PREMISE_NAME+“，”
+Constants.COLUMN_premission_ADDRESS+“，”
+Constants.REF_PREMISE_CATEGORY_TABLE+“+Constants.COLUMN_PREMISE_CATEGORY_ID+”作为“+Constants.COLUMN_FK_PREMISE_CATEGORY_ID+”，”
+Constants.REF_PREMISE_CATEGORY_MASTER_TABLE+“+Constants.COLUMN_PREMISE_CATEGORY_MASTER_ID+”作为“+Constants.COLUMN_FK_PREMISE_CATEGORY_MASTER_ID+”
+常量.列_前提_注册表_编号+“，”
+Constants.COLUMN_PREMISE_REG_DATE+“，”
+Constants.REF_PREMISE_CATEGORY_TABLE+“+Constants.COLUMN_DESCRIPTION+”作为PremiseContegoryDescription，“
+Constants.REF_PREMISE_CATEGORY_MASTER_TABLE+“+Constants.COLUMN_DESCRIPTION+”作为PremiseContegoryMasterDescription”
+“FROM”+表名
+“左联接”+常量.REF\u前提\u类别\u主表+“开”+
Constants.TXN_PREMISE_TABLE+“+Constants.COLUMN_PREMISE_CATEGORY_MASTER_ID+”=“+Constants.REF_PREMISE_CATEGORY_MASTER_TABLE+”+“+Constants.COLUMN_代码
+“左联接”+常量.REF\u前提\u类别\u表+“开”+
Constants.TXN_PREMISE_TABLE+“+Constants.COLUMN_FK_PREMISE_CATEGORY_ID+”=“+Constants.REF_PREMISE_CATEGORY_TABLE+”+“+Constants.COLUMN_代码
//“+”其中“+Constants.REF_PREMISE_CATEGORY_TABLE+”“+Constants.COLUMN_LANG+”='MYS'”
//+Constants.REF_PREMISE_CATEGORY_MASTER_TABLE+“+Constants.COLUMN_LANG+”='MYS'和“
//+Constants.COLUMN_PREMISE_NAME+“'-”和“+Constants.COLUMN_PREMISE_NAME+”-TIADA-”
+“订单依据”+列名+“ASC限制3”；
Log.d（“test”，“getTxnTableData:”+selectQuery）；
试一试{
open（）；
//确保数据库不是空的
if（sqLiteDatabase！=null）{
//获取数据库中所有状态的游标
Cursor Cursor=sqLiteDatabase.rawQuery（selectQuery，null）；
d（“test”，“getTxnTableData:cursor”+cursor.toString（））；
Log.d（“测试”，“getTxnTableData:外部”）；
if（cursor.moveToFirst（））{
而（！cursor.isAfterLast（））{
TXN_前提前提条件column=新的TXN_前提条件（）；
//setPremiseId（cursor.getString（0））；
setPremiseRef（cursor.getString（cursor.getColumnIndex（Constants.COLUMN_PREMISE_REF））；
setPremiseName（cursor.getString（cursor.getColumnIndex（Constants.COLUMN\u PREMISE\u NAME））；
setPremiseAddress（cursor.getString（cursor.getColumnIndex（Constants.COLUMN_PREMISE_ADDRESS））；
premiseColumn.setFk_premiseCategoryId（cursor.getString（cursor.getColumnIndex（Constants.COLUMN_FK_premiseCategoryId））；
premiseColumn.setFk_premiseContegoryMasterId（cursor.getString（cursor.getColumnIndex（Constants.COLUMN_FK_premiseColumn_CATEGORY_MASTER_ID））；
setPremiseGeno（cursor.getString（cursor.getColumnIndex（Constants.COLUMN_PREMISE_REG_NO））；
setPremiseGrandate（cursor.getString（cursor.getColumnIndex（Constants.COLUMN_PREMISE_REG_DATE））；
//todo:临时前提类别说明
premiseColumn.setPremiseCategoryName（cursor.getString（cursor.getColumnIndex（“premiseCategoryDescription”））；
setPremiseColumn.SetPremiseColumnySterName（cursor.getString（cursor.getColumnIndex（“PremiseColumnySterDescription”））；
Log.d（“test”，“getTxnTableData:premiseName”+cursor.getString（cursor.getColumnIndex（Constants.COLUMN\u PREMISE\u NAME））；
//在光标中添加一列
itemList.add（premise列）；
cursor.moveToNext（）；
}
}
cursor.close（）；
}
close（）；
}捕获（SQLE异常）{
e、 printStackTrace（）；
}
Log.d（“test”、“getTxnTableData:itemlist”+itemlist.size（））；
返回项目列表；
}

由于WHERE子句依赖于基础数据，因此无法重新创建问题，从而确定问题

因此，您需要遵循简单的问题确定

正如您所指出的，它在没有WHERE子句的情况下工作

• 1） 删除WHERE子句并运行
  • 1a）如果您现在检索行，然后逐条件逐步构建WHERE子句，这将突出显示问题

  • 1b）如果在删除WHERE子句后，没有行的问题仍然存在，则从

    String selectQuery=“SELECT*FROM”+tableName开始逐步构建整个SQL，检查结果是否符合预期
    

我建议换衣服

    Log.d("test", "getTxnTableData: cursor " + cursor.toString());

到

这将显示光标中的行数

此外，您还可以利用

---

编辑 仔细观察，WHER似乎存在一些问题

    Log.d("test", "getTxnTableData: cursor " + cursor.getCount());

" WHERE " + Constants.REF_PREMISE_CATEGORY_TABLE + "." + Constants.COLUMN_LANG + " = 'MYS'"
              + Constants.REF_PREMISE_CATEGORY_MASTER_TABLE + "." + Constants.COLUMN_LANG + " = 'MYS' AND "
              + Constants.COLUMN_PREMISE_NAME + " <> '-' AND " + Constants.COLUMN_PREMISE_NAME + " <> '-TIADA-'"

" WHERE " + 
    Constants.REF_PREMISE_CATEGORY_TABLE + "." + 
        Constants.COLUMN_LANG + 
        " = 'MYS'" + 
" AND " + 
    Constants.REF_PREMISE_CATEGORY_MASTER_TABLE + "." +
        Constants.COLUMN_LANG + " = 'MYS' " + 
" AND (" +
            Constants.COLUMN_PREMISE_NAME + " <> '-' " + 
            "  OR " + 
            Constants.COLUMN_PREMISE_NAME + " <> '-TIADA-'" + 
")"