JDBC for SQL Server - Herong's Tutorial Examples - v3.14, by 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) 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=herong;password=T0pSecret;" + "database=AdventureWorks2019"); // 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.
herong> java -version java version "17.0.1" 2021-10-19 LTS herong> java -cp .;mssql-jdbc-9.4.1.jre16.jar ExecuteQuery.java
Table of Contents
JDBC (Java Database Connectivity) Introduction
Microsoft SQL Server Express Edition
Microsoft JDBC Driver for SQL Server
►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
Using Connection Pool with JDBC
JDBC-ODBC Bridge Driver - sun.jdbc.odbc.JdbcOdbcDriver
JDBC-ODBC Bridge Driver - Flat Text Files
JDBC-ODBC Bridge Driver - MS Access