public ResultSet getRecordsCount(){
ResultSet result = null;
try {
result = statement.executeQuery("Select count(word) from records");
} catch (SQLException e) {
e.printStackTrace();
}
return result;
}
I'm trying to get total number of rows in my database but it is returning garbage value.
I'm Using SQL Server 2012 and there is no exception in the code.
Is my code correct?
I would use this code:
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public static void main(String[] args) {
int numRows = 0;
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String userName = "user"; //in case you need
String password = "password"; // in case you need
String url = "jdbc:microsoft:sqlserver://localhost:1433"+";databaseName=THE_NAME_OF_MY_DB";
Connection con = DriverManager.getConnection(url, userName, password);
// if you don't need user and password then
// Connection con = DriverManager.getConnection(url);
String SQL = "SELECT * FROM table_name";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(SQL);
ResultSetMetaData rsMetaData = rs.getMetaData();
// This while loop is to loop over each row and the for loop
// is to loop over each field
while (rs.next()) {
for(int i=1; i <= rs.getColumnCount(); i++){
numRows ++;
System.out.println(rs.getString(i));
//This prints field by field
}
}
System.out.println(Total column number"+rs.getColumnCount());
System.out.println(Total row number"+Integer.toString(numRows));
rs.close();
stmt.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
Related
I am working on a program that upload PDF files to FileNet, and was wondering if there is a way to retrieve the GUID without running a SQL Query. I also tried Retrieving a Document (fetchInstance) from https://www.ibm.com/support/knowledgecenter/en/SSNW2F_5.5.0/com.ibm.p8.ce.dev.ce.doc/document_procedures.htm without the new Id part of the code and that did not work.
public class DocIdGenerator implements EventActionHandler {
private static final String DS = "ECMSvcsXA";
private static final String INSERT_SQL = "Insert into dbo.ICNLegalDocID_S (object_id) values (?)";
private static final String SELECT_SQL = "Select DocId From dbo.ICNLegalDocID_S Where object_id = ?";
#Override
public void onEvent(ObjectChangeEvent event, Id subscriptionId)
throws EngineRuntimeException {
// Get the Document object from the event
ObjectStore os = event.getObjectStore();
Id objectId = event.get_SourceObjectId();
PropertyFilter pf = new PropertyFilter();
pf.addIncludeProperty(new FilterElement(null, null, null, "DocumentID", null));
pf.addIncludeProperty(new FilterElement(null, null, null, PropertyNames.VERSION_SERIES, null));
Document sourceDoc = Factory.Document.fetchInstance(os, objectId, pf);
Properties props = sourceDoc.getProperties();
String documentId = props.getStringValue("DocumentID");
VersionSeries vs = sourceDoc.get_VersionSeries();
Id versionSeriesId = vs.get_Id();
if (documentId == null || documentId.isEmpty()) {
// Get the JNDI Context to lookup DataSource and Insert the objectId to get the auto generated docId
Context ctx;
DataSource ds;
Connection con = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
ctx = new InitialContext();
ds = (DataSource) ctx.lookup(DS);
con = ds.getConnection();
ps = con.prepareStatement(SELECT_SQL);
ps.setString(1, versionSeriesId.toString());
rs = ps.executeQuery();
BigDecimal docId = null;
if (rs.next()) {
// Document Id already exists
docId = rs.getBigDecimal(1);
} else {
// Document Id doesn't exist inert to get it
ps = con.prepareStatement(INSERT_SQL, Statement.RETURN_GENERATED_KEYS);
ps.setString(1, versionSeriesId.toString());
ps.executeUpdate();
rs = ps.getGeneratedKeys();
if (rs.next()) {
docId = rs.getBigDecimal(1);
}
}
props.putValue("DocumentID", docId.toString());
sourceDoc.save(RefreshMode.REFRESH);
} catch (Exception e) {
e.printStackTrace();
if (e instanceof EngineRuntimeException) {
throw (EngineRuntimeException)e;
} else {
ErrorStack es = new ErrorStack("DocIdGeneratorSub", new ErrorRecord[] {new ErrorRecord(e)});
throw new EngineRuntimeException(es);
}
} finally {
close(con, ps, rs);
}
}
}
private void close(Connection con, PreparedStatement ps, ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
// Ignore
}
}
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
// Ignore
}
}
if (con != null) {
try {
con.close();
} catch (SQLException e) {
// Ignore
}
}
}
}
I am not sure that I understand what to you trying to do.
When you create new document instance (Document doc = Factory.Document.newInstance()) and invoke doc.save(Refresh.REFRESH) options, FileNet inserts new DB record for document instance, generate new ID and populate it backward to the document instance on your side.
So, to get Id for new Document you just need to call doc.getId() to get it.
As I understand from your sample, you try to use event handler, If you invoke handler on the event before creation, you don't have any Id at this time, you cant try to handle the event after document creation.
This program should print out the values in order ascending order. But it only displays 957.0 repeatedly. How do I display the numbers in order?
import java.io.*;
import java.util.*;
class PriorityQ {
public int maxSize;
public double[] queArray;
public int nItems;
//------
public PriorityQ(int s){
maxSize = s;
queArray = new double[maxSize];
nItems = 0;
}
//-----
public void insert(double item){
int j;
if(nItems == 0){
queArray[nItems++] = item;
}
else{
for(j = nItems-1; j >= 0; j--){
if(item > queArray[j]){
queArray[j + 1] = item;
}
else{
break;
}
}
queArray[j + 1] = item;
nItems++;
}
}
//-----
public double remove(){
return queArray[--nItems];
}
//-----
public double peekMin(){
return queArray[nItems - 1];
}
//-----
public boolean isEmpty(){
return(nItems == 0);
}
//-----
public boolean isFull(){
return(nItems == maxSize);
}
}
//-----
public class PriorityQApp{
public static void main(String[] args) throws IOException{
PriorityQ thePQ = new PriorityQ(5);
thePQ.insert(546);
thePQ.insert(687);
thePQ.insert(36);
thePQ.insert(98);
thePQ.insert(957);
while(!thePQ.isEmpty()){
double item = thePQ.remove();
System.out.print(item + " ");
}
System.out.println("");
}
}
You should save yourself the effort and use a priority queue with the generic type Double. If you wanted descending order you could even use a comparator that orders the highest value before the lowest, but you asked for ascending.
Your problem is that your array does contain many copies of 957.
This is because of this line in your code:
if(item > queArray[j]){
queArray[j + 1] = item;
}
Try:
import java.io.*;
import java.util.*;
public class PriorityQApp{
public static void main(String[] args) throws IOException{
PriorityQueue<Double> thePQ = new PriorityQueue<Double>(5);
thePQ.add(546);
thePQ.add(687);
thePQ.add(36);
thePQ.add(98);
thePQ.add(957);
while(thePQ.size() > 0){
double item = thePQ.poll();
System.out.print(item + " ");
}
System.out.println("");
}
}
Or I can fix your code to print out the queue in descending order leaving it to you to then make it print out in ascending order, the block I pointed to before should read like this instead:
if(item < queArray[j]){
queArray[j + 1] = queArray[j];
}
I'm relatively new to Codename One. I'm trying to read an URL and save the content on a String. I tried:
private String lectura = "";
private String escritura = "";
/*-------------------------------------------------------
* Methods
*-------------------------------------------------------
*/
public Bulbs(int i, char rtype){
type = rtype;
number = i;
status = readCNO(type, number);
}
public String giveStatus(){
status = readCNO(type, number);
return status;
}
public void turnBulbOn(){
writeCNO('B', number, 1);
}
public void turnBulbOff(){
writeCNO('B', number, 0);
}
public String readCNO(char type, int number){
ConnectionRequest r = new ConnectionRequest();
r.setUrl("http://192.168.1.3/arduino/R!" + type + "/" + Integer.toString(number));
r.setPost(false);
r.addResponseListener(new ActionListener()
{
public void actionPerformed(ActionEvent ev)
{
try
{
NetworkEvent event = (NetworkEvent) ev;
byte[] data= (byte[]) event.getMetaData();
String decodedData = new String(data,"UTF-8");
System.out.println(decodedData);
lectura = decodedData;
} catch (Exception ex)
{
ex.printStackTrace();
lectura = "NoBulb";
}
}
});
NetworkManager.getInstance().addToQueue(r);
return lectura;
}
public String writeCNO(char type, int number, int action){
ConnectionRequest r2 = new ConnectionRequest();
r2.setUrl("http://192.168.1.3/arduino/R!" + type + "/" + Integer.toString(number) + "/"+ action);
r2.setPost(false);
r2.addResponseListener(new ActionListener()
{
public void actionPerformed(ActionEvent ev)
{
try
{
NetworkEvent event = (NetworkEvent) ev;
byte[] data= (byte[]) event.getMetaData();
String decodedData = new String(data,"UTF-8");
System.out.println(decodedData);
escritura = decodedData;
} catch (Exception ex)
{
ex.printStackTrace();
escritura = "NoBulb";
}
}
});
NetworkManager.getInstance().addToQueue(r2);
return escritura;
}
However when I run it, the Console displays a bunch of errors like:
Duplicate entry in the queue: com.codename1.io.ConnectionRequest: com.codename1.io.ConnectionRequest#22b3c488
Help very appreciated!
David.
You are adding the exact same URL to the queue twice which Codename One detects as a probable mistake. If this is intentional just invoke setDuplicateSupported(true) on both connection requests.
I am a novice in android and I am using achartEngine library to draw line Graph. what I want to do is to update the graph by using a spinner. For exmaple, if I chose the first option I will get a yellow graph and when
I swich to the second option in my spinner, the graph changes and becomes white with new title and data
for the moment I can only update the data but not the rest of the graph
package com.example.test2;
import java.text.Format;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.List;
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.PointStyle;
import org.achartengine.model.SeriesSelection;
import org.achartengine.model.TimeSeries;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.example.test2.R;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class Graphique extends Activity {
private GraphicalView mChart1;
private GraphicalView mChart2;
private TimeSeries glecimieSeries ;
private TimeSeries pressionSeries;
private XYMultipleSeriesDataset dataset;
private XYSeriesRenderer glecimieRenderer;
private XYSeriesRenderer pressionRenderer;
private XYMultipleSeriesRenderer multiRenderer;
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> listeappareil;
// url to get all products list
private static String url_liste_appareil ;
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static String TAG_APPAREIL;
private static final String TAG_PID = "pid";
private static final String TAG_NOM = "nom";
private static final String TAG_J = "jour";
private static final String TAG_Y = "Y";
// products JSONArray
JSONArray appareil = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.graphique);
// getting intent data
Intent in = getIntent();
// Get JSON values from previous intent
String pid = in.getStringExtra(TAG_PID);
String nom = in.getStringExtra(TAG_NOM);
// Displaying all values on the screen
TextView lblNom = (TextView) findViewById(R.id.nom_patient);
lblNom.setText(nom);
Spinner mySpinner = (Spinner)findViewById(R.id.mesure);
ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.appareils, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySpinner.setAdapter(adapter);
OnItemSelectedListener selectedGraph = new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> spinner, View container,
int position, long id) {
String graph = spinner.getItemAtPosition(position).toString().toLowerCase();
if(graph == "tensiometre"){
url_liste_appareil = "http://10.0.2.2/connexion_android/"+graph+".php";
TAG_APPAREIL = graph;
// Setting up chart
setupChart2();
// Start plotting chart
new ChartTask2().execute();
}else{
url_liste_appareil = "http://10.0.2.2/connexion_android/"+graph+".php";
TAG_APPAREIL = graph;
// Setting up chart
setupChart1();
// Start plotting chart
new ChartTask1().execute();
}
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
};
// Setting ItemClick Handler for Spinner Widget
mySpinner.setOnItemSelectedListener(selectedGraph);
}
private void setupChart1(){
// Creating TimeSeries for Glecimie
glecimieSeries = new TimeSeries("Glecimie");
// Creating a dataset to hold each series
dataset = new XYMultipleSeriesDataset();
// Adding Glecimie Series to the dataset
dataset.addSeries(glecimieSeries);
// Creating XYSeriesRenderer to customize glecimieSeries
glecimieRenderer = new XYSeriesRenderer();
glecimieRenderer.setColor(Color.YELLOW);
glecimieRenderer.setPointStyle(PointStyle.CIRCLE);
glecimieRenderer.setFillPoints(true);
glecimieRenderer.setLineWidth(2);
glecimieRenderer.setDisplayChartValues(true);
// Creating a XYMultipleSeriesRenderer to customize the whole chart
multiRenderer = new XYMultipleSeriesRenderer();
multiRenderer.setZoomButtonsVisible(true);
// Adding glecimieRenderer and pressionRenderer to multipleRenderer
// Note: The order of adding dataseries to dataset and renderers to multipleRenderer
// should be same
multiRenderer.addSeriesRenderer(glecimieRenderer);
// Getting a reference to LinearLayout of the MainActivity Layout
LinearLayout chartContainer = (LinearLayout) findViewById(R.id.chart_container);
// Creating a Time Chart
mChart1 = (GraphicalView) ChartFactory.getTimeChartView(getBaseContext(), dataset, multiRenderer,"dd-MMM-yyyy");
multiRenderer.setClickEnabled(true);
multiRenderer.setSelectableBuffer(10);
// Setting a click event listener for the graph
mChart1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Format formatter = new SimpleDateFormat("dd-MMM-yyyy");
SeriesSelection seriesSelection = mChart1.getCurrentSeriesAndPoint();
if (seriesSelection != null) {
int seriesIndex = seriesSelection.getSeriesIndex();
String selectedSeries="Glecimie";
if(seriesIndex==0)
selectedSeries = "Glecimie";
else
selectedSeries = "Pression";
// Getting the clicked Date ( x value )
long clickedDateSeconds = (long) seriesSelection.getXValue();
Date clickedDate = new Date(clickedDateSeconds);
String strDate = formatter.format(clickedDate);
// Getting the y value
int amount = (int) seriesSelection.getValue();
// Displaying Toast Message
Toast.makeText(
getBaseContext(),
"Prélèvement au " + strDate + " : " + amount ,
Toast.LENGTH_SHORT).show();
}
}
});
chartContainer.removeAllViews();
// Adding the Line Chart to the LinearLayout
chartContainer.addView(mChart1);
}
private class ChartTask1 extends AsyncTask<String, String, String>{
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Graphique.this);
pDialog.setMessage("Loading data. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
// Generates dummy data in a non-ui thread
protected String doInBackground(String... params) {
// Building Parameters
List<NameValuePair> param = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_liste_appareil, "GET", param);
// Check your log cat for JSON reponse
Log.d("Tous les appareil: ", json.toString());
try{
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
appareil = json.getJSONArray(TAG_APPAREIL);
Date[] dt = new Date[appareil.length()];
// looping through All Products
for (int j = 0; j < appareil.length(); j++) {
JSONObject p = appareil.getJSONObject(j);
// Storing each json item in variable
GregorianCalendar gc = new GregorianCalendar(2012, 10, j+1);
dt[j] = gc.getTime();
String y = p.getString(TAG_Y);
String jr = p.getString(TAG_J);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date d = sdf.parse(jr);
// Adding data to Glecimie and Pression Series
glecimieSeries.add(d,Double.parseDouble(y));
multiRenderer.setXTitle("Dates");
multiRenderer.setYTitle("Prélèvements");
}
}
}catch (JSONException e) {
e.printStackTrace();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
// Plotting generated data in the graph
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into the graph
* */
mChart1.repaint();
}
});
}
}
private void setupChart2(){
// Creating TimeSeries for Pression
pressionSeries = new TimeSeries("Pression");
// Creating a dataset to hold each series
dataset = new XYMultipleSeriesDataset();
// Adding Glecimie Series to dataset
dataset.addSeries(pressionSeries);
// Creating XYSeriesRenderer to customize pressionSeries
pressionRenderer = new XYSeriesRenderer();
pressionRenderer.setColor(Color.YELLOW);
pressionRenderer.setPointStyle(PointStyle.CIRCLE);
pressionRenderer.setFillPoints(true);
pressionRenderer.setLineWidth(2);
pressionRenderer.setDisplayChartValues(true);
// Creating a XYMultipleSeriesRenderer to customize the whole chart
multiRenderer = new XYMultipleSeriesRenderer();
multiRenderer.setZoomButtonsVisible(true);
// Adding glecimieRenderer and pressionRenderer to multipleRenderer
// Note: The order of adding dataseries to dataset and renderers to multipleRenderer
// should be same
multiRenderer.addSeriesRenderer(pressionRenderer);
// Getting a reference to LinearLayout of the MainActivity Layout
LinearLayout chartContainer = (LinearLayout) findViewById(R.id.chart_container);
// Creating a Time Chart
mChart2 = (GraphicalView) ChartFactory.getTimeChartView(getBaseContext(), dataset, multiRenderer,"dd-MMM-yyyy");
multiRenderer.setClickEnabled(true);
multiRenderer.setSelectableBuffer(10);
// Setting a click event listener for the graph
mChart2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Format formatter = new SimpleDateFormat("dd-MMM-yyyy");
SeriesSelection seriesSelection = mChart2.getCurrentSeriesAndPoint();
if (seriesSelection != null) {
int seriesIndex = seriesSelection.getSeriesIndex();
String selectedSeries="Glecimie";
if(seriesIndex==0)
selectedSeries = "Glecimie";
else
selectedSeries = "Pression";
// Getting the clicked Date ( x value )
long clickedDateSeconds = (long) seriesSelection.getXValue();
Date clickedDate = new Date(clickedDateSeconds);
String strDate = formatter.format(clickedDate);
// Getting the y value
int amount = (int) seriesSelection.getValue();
// Displaying Toast Message
Toast.makeText(
getBaseContext(),
" Prélèvement au" + strDate + " : " + amount ,
Toast.LENGTH_SHORT).show();
}
}
});
chartContainer.removeAllViews();
// Adding the Line Chart to the LinearLayout
chartContainer.addView(mChart2);
}
private class ChartTask2 extends AsyncTask<String, String, String>{
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Graphique.this);
pDialog.setMessage("Loading data. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
// Generates dummy data in a non-ui thread
protected String doInBackground(String... params) {
// Building Parameters
List<NameValuePair> param = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_liste_appareil, "GET", param);
// Check your log cat for JSON reponse
Log.d("Tous les appareil: ", json.toString());
try{
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
appareil = json.getJSONArray(TAG_APPAREIL);
Date[] dt = new Date[appareil.length()];
// looping through All Products
for (int j = 0; j < appareil.length(); j++) {
JSONObject p = appareil.getJSONObject(j);
// Storing each json item in variable
GregorianCalendar gc = new GregorianCalendar(2012, 10, j+1);
dt[j] = gc.getTime();
String y = p.getString(TAG_Y);
String jr = p.getString(TAG_J);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date d = sdf.parse(jr);
// Adding data to Glecimie and Pression Series
pressionSeries.add(d,Double.parseDouble(y));
multiRenderer.setChartTitle("la pression");
multiRenderer.setXTitle("Dates");
multiRenderer.setYTitle("Prélèvements");
}
}
}catch (JSONException e) {
e.printStackTrace();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
// Plotting generated data in the graph
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into the graph
* */
mChart2.repaint();
}
});
}
}
// Initiating Menu XML file (menu.xml)
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_graphique, menu);
return (super.onCreateOptionsMenu(menu));
}
}
Please help
In order to refresh both charts, you need to call repaint on both:
mChart1.repaint();
mChart2.repaint();
You can update the color and other values of the chart by passing values.
In openChart() method you can pass the values.
private void openChart(final String[] code, final int[] distribution,final int color){
defaultRenderer.setBackgroundColor(color);
}
The code below shows that a record is deleted when the sql statement is:
select * from test where qty between 50 and 59
but the sql statement:
select * from test where partno like 'PART/005%'
throws the exception:
Advantage.Data.Provider.AdsException: Error 5072: Action requires read-write access to the table
How can you reliably delete a record with a where clause applied?
Note: I'm using Advantage Database v9.10.1.9, VS2008, .Net Framework 3.5 and WinXP 32 bit
using System.IO;
using Advantage.Data.Provider;
using AdvantageClientEngine;
using NUnit.Framework;
namespace NetworkEidetics.Core.Tests.Dbf
{
[TestFixture]
public class AdvantageDatabaseTests
{
private const string DefaultConnectionString = #"data source={0};ServerType=local;TableType=ADS_CDX;LockMode=COMPATIBLE;TrimTrailingSpaces=TRUE;ShowDeleted=FALSE";
private const string TestFilesDirectory = "./TestFiles";
[SetUp]
public void Setup()
{
const string createSql = #"CREATE TABLE [{0}] (ITEM_NO char(4), PARTNO char(20), QTY numeric(6,0), QUOTE numeric(12,4)) ";
const string insertSql = #"INSERT INTO [{0}] (ITEM_NO, PARTNO, QTY, QUOTE) VALUES('{1}', '{2}', {3}, {4})";
const string filename = "test.dbf";
var connectionString = string.Format(DefaultConnectionString, TestFilesDirectory);
using (var connection = new AdsConnection(connectionString)) {
connection.Open();
using (var transaction = connection.BeginTransaction()) {
using (var command = connection.CreateCommand()) {
command.CommandText = string.Format(createSql, filename);
command.Transaction = transaction;
command.ExecuteNonQuery();
}
transaction.Commit();
}
using (var transaction = connection.BeginTransaction()) {
for (var i = 0; i < 1000; ++i) {
using (var command = connection.CreateCommand()) {
var itemNo = string.Format("{0}", i);
var partNumber = string.Format("PART/{0:d4}", i);
var quantity = i;
var quote = i * 10;
command.CommandText = string.Format(insertSql, filename, itemNo, partNumber, quantity, quote);
command.Transaction = transaction;
command.ExecuteNonQuery();
}
}
transaction.Commit();
}
connection.Close();
}
}
[TearDown]
public void TearDown()
{
File.Delete("./TestFiles/test.dbf");
}
[Test]
public void CanDeleteRecord()
{
const string sqlStatement = #"select * from test";
Assert.AreEqual(1000, GetRecordCount(sqlStatement));
DeleteRecord(sqlStatement, 3);
Assert.AreEqual(999, GetRecordCount(sqlStatement));
}
[Test]
public void CanDeleteRecordBetween()
{
const string sqlStatement = #"select * from test where qty between 50 and 59";
Assert.AreEqual(10, GetRecordCount(sqlStatement));
DeleteRecord(sqlStatement, 3);
Assert.AreEqual(9, GetRecordCount(sqlStatement));
}
[Test]
public void CanDeleteRecordWithLike()
{
const string sqlStatement = #"select * from test where partno like 'PART/005%'";
Assert.AreEqual(10, GetRecordCount(sqlStatement));
DeleteRecord(sqlStatement, 3);
Assert.AreEqual(9, GetRecordCount(sqlStatement));
}
public int GetRecordCount(string sqlStatement)
{
var connectionString = string.Format(DefaultConnectionString, TestFilesDirectory);
using (var connection = new AdsConnection(connectionString)) {
connection.Open();
using (var command = connection.CreateCommand()) {
command.CommandText = sqlStatement;
var reader = command.ExecuteExtendedReader();
return reader.GetRecordCount(AdsExtendedReader.FilterOption.RespectFilters);
}
}
}
public void DeleteRecord(string sqlStatement, int rowIndex)
{
var connectionString = string.Format(DefaultConnectionString, TestFilesDirectory);
using (var connection = new AdsConnection(connectionString)) {
connection.Open();
using (var command = connection.CreateCommand()) {
command.CommandText = sqlStatement;
var reader = command.ExecuteExtendedReader();
reader.GotoBOF();
reader.Read();
if (rowIndex != 0) {
ACE.AdsSkip(reader.AdsActiveHandle, rowIndex);
}
reader.DeleteRecord();
}
connection.Close();
}
}
}
}
LIKE results in a static cursor instead of a live cursor, meaning it is a read-only dataset. To remove a row in this situation it would be better to use an SQL DELETE statement.
DELETE FROM test where partno LIKE 'PART/005%'
I'm assuming your tests are just that, only tests. They are using some fairly inefficient mechanisms to locate and remove rows.
Update after comment that there is no key field:
How about using the LEFT scalar instead of LIKE (might not work for all cases, but does for your example). If the size is always the same you could also add an index on left(partno,8) to increase the performance:
select * from test where left(partno,8) = 'PART/005'
Then you could use the Delete function of the extended data reader directly on this live result set (no gotop and skip).
Update after Alex's ROWID comment
I didn't know our ROWID came from the base table, even in static cursors. Alex's comment is the solution to your problem. First:
SELECT t.*, t.rowid FROM test t WHERE x LIKE 'PART/005%'
then:
DELETE FROM test WHERE rowid = :thisid