android - Cursor getString() or getInt() doesn't return the value at given index -


i have created sqlite database , table android app. values can inserted , long id returned no problems. when returned id used retrieve other fields getcolumnindex(column_name) returns correct index, when use getsting , getint value of field, app crashes. android studio doesn't give errors. please help.

database handler class:

public class sqlitedbmanager extends sqliteopenhelper{ private static final int db_version = 1;  private static final string db_name = "baby_diary.db"  private static final string tbl_babies = "babies"; private static final string babies_baby_id = "baby_id"; private static final string babies_name = "name"; private static final string babies_dob = "dob"; private static final string babies_gender = "gender"; private static final string babies_weight = "weight"; private static final string babies_height = "height"; private static final string babies_theme = "theme";  public sqlitedbmanager(context context, string name, sqlitedatabase.cursorfactory factory, int version, databaseerrorhandler errorhandler) {         super(context, db_name, factory, db_version, errorhandler);      }  public void oncreate(sqlitedatabase db) {          string create_tbl_babies = "create table " + tbl_babies + "( " +                 babies_baby_id + " integer primary key autoincrement, " +                 babies_name + " text, " +                 babies_dob + " text, " +                 babies_gender + " text, " +                 babies_weight + " real, " +                 babies_height + " real, " +                 babies_theme + " text" + " );";                  db.execsql(create_tbl_babies);     }     public babies getbabybyid(long id){         sqlitedatabase db = getwritabledatabase();         string query = "select * " + tbl_babies + " " + babies_baby_id                 + " = \"" + id + "\";";         cursor cursor = db.query(tbl_babies,                 null,                 babies_baby_id + " = " + id,                 null, null, null, null);          if (cursor != null && cursor.getcount() > 0) {                 //for testing getint                 int id = cursor.getint(cursor.getcolumnindex(babies_baby_id));                 string name = cursor.getstring(cursor.getcolumnindex(babies_name));                 cursor.close();             }

you have use cursor.movetofirst() before querying first row cursor. change if statement to:

   if (cursor != null && cursor.movetofirst()) {

also, cursor has closed if have no results. i'd recommend writing this:

try {    if (cursor != null && cursor.movetofirst) {             //for testing getint             int id = cursor.getint(cursor.getcolumnindex(babies_baby_id));             string name = cursor.getstring(cursor.getcolumnindex(babies_name));         } } {     if(cursor != null) {         cursor.close();     } }

this way cursor closed no matter exception may occur.


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