Calling createStatement() and executeQuery

<< Microsoft JDBC Driver - Query Statements and Result Sets

<< JDBC Tutorials - Herong's Tutorial Notes

This section describes how to run a SELECT query statement with createStatement() and executeQuery().

After a connection object is created correctly, you need to create a statement object from the connection object in order to execute a SQL statement on the SQL Server, see the following two method call examples:

Statement sta = con.createStatement();
sta.executeQuery("SELECT ...");

Here is a sample program that executes a SELECT statement to get the current date from the SQL Server:

/**
 * ExecuteQuery.java
 * Copyright (c) 2007 by Dr. Herong Yang. All rights reserved.
 */
import java.sql.*;
public class ExecuteQuery {
  public static void main(String [] args) {
    Connection con = null;
    try {

// Load Microsoft JDBC Driver 1.0
      Class.forName(
        "com.microsoft.sqlserver.jdbc.SQLServerDriver");

// Obtaining a connection to SQL Server
      con = DriverManager.getConnection(
          "jdbc:sqlserver://localhost:1269;"
        + "user=sa;password=HerongYang;"
        + "database=AdventureWorksLT");

// Execute a query statement
      Statement sta = con.createStatement(); 
      sta.executeQuery("SELECT GETDATE()");
      sta.close();

      con.close();        
    } catch (java.lang.ClassNotFoundException e) {
      System.err.println("ClassNotFoundException: "
        +e.getMessage());
    } catch (SQLException e) {
      System.err.println("SQLException: "
        +e.getMessage());
    }
  }
}

The program runs correctly. But you will get no output, since the returning data from the query execution was not retrieved and printed to the screen. See the next tutorial to know how to do this.

Sections in This Chapter

Commonly Used JDBC Class Methods

Calling createStatement() and executeQuery

Receiving ResultSet Objects from executeQuery

Closing ResultSet Objects - res.close()

Looping through ResultSet with res.next()

Retrieving Field Values using res.get*() Methods

Using ResultSetMetaData Objects to List All Fields