JDBC Tutorials - Herong's Tutorial Examples - Version 3.03, by Dr. Herong Yang
Calling createStatement() and executeQuery
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) 2015, HerongYang.com, All Rights Reserved. */ import java.sql.*; public class ExecuteQuery { public static void main(String [] args) { Connection con = null; try { // Obtaining a connection to SQL Server con = DriverManager.getConnection( "jdbc:sqlserver://localhost\\SQLEXPRESS;" + "user=sa;password=HerongY@ng;" + "database=AdventureWorks2014"); // Execute a query statement Statement sta = con.createStatement(); sta.executeQuery("SELECT GETDATE()"); sta.close(); con.close(); } catch (Exception e) { e.printStackTrace(); } } }
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.
C:\herong>\Progra~1\java\jdk1.8.0_45\bin\javac ExecuteQuery.java C:\herong>\Progra~1\java\jdk1.8.0_45\bin\java -cp .;\local\lib\sqljdbc42.jar ExecuteQuery
Last update: 2015.
Table of Contents
JDBC (Java Database Connectivity) Introduction
Installing and Running Java DB - Derby
Derby (Java DB) JDBC DataSource Objects
Java DB (Derby) - DML Statements
Java DB (Derby) - ResultSet Objects of Queries
Java DB (Derby) - PreparedStatement
MySQL JDBC Driver (MySQL Connector/J)
MySQL - Reference Implementation of JdbcRowSet
MySQL - JBDC CallableStatement
MySQL CLOB (Character Large Object) - TEXT
MySQL BLOB (Binary Large Object) - BLOB
Oracle Express Edition Installation on Windows
Oracle - Reference Implementation of JdbcRowSet
Oracle - JBDC CallableStatement
Oracle CLOB (Character Large Object) - TEXT
Oracle BLOB (Binary Large Object) - BLOB
Microsoft SQL Server 2005 Express Edition
Microsoft JDBC Driver for SQL Server - sqljdbc42.jar
►Microsoft JDBC Driver - Query Statements and Result Sets
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
Microsoft JDBC Driver - DatabaseMetaData Object
Microsoft JDBC Driver - DDL Statements
Microsoft JDBC Driver - DML Statements
SQL Server - PreparedStatement
SQL Server CLOB (Character Large Object) - TEXT
SQL Server BLOB (Binary Large Object) - BLOB
JDBC-ODBC Bridge Driver - sun.jdbc.odbc.JdbcOdbcDriver
JDBC-ODBC Bridge Driver - Flat Text Files
JDBC-ODBC Bridge Driver - MS Access
JDBC-ODBC Bridge Driver - MS SQL Server
Summary of JDBC Drivers and Database Servers