1. Preparation

SQL Server database installation, IDEA and JDK environment installation and configuration. I installed SQL Server 2008, the JAVA environment is as follows, IDEA is installed automatically。

Download the driver that matches your own SQL Server version number:https://www.microsoft.com/zh-cn/download/driver.aspx

I downloaded

Just download one of the three programs. I downloaded the exe and got the compressed file after execution, the uncompressed filePut it under the IDEA installation path (D:\IntelliJ IDEA 2019.2.3\jbr).

Two, configure SQL Server

1. Configure login users

Right-click the database server name and click PropertiesEnable SQL Server and windows authentication mode.

Three, SQL Server IP and port settings

Right click on my computer and select Manage-"

Select the IP address and TCP port you want to use, and start it. Restart the database.

Four, IDEA creation project

The project directory is as follows

Add JDBC driver package. Click File-> Project Structure-> Libraries -> + -> java -> select the file directory of sqljdbc42.

The test procedure is as follows:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;


public class ConnectDB {

    public static void main(String args[]) {
        String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=Test;user=sa;password=123456";//sa connection

        // Declare the JDBC objects.
                 Connection con = null; //Session connection
                 Statement stmt = null; //Object used to execute static SQL statements and return the results they generate.
                 ResultSet rs = null; //Data table of database result set

        try {
                         //1-Register the driver, the driver manager class loads the static method of the SQLServerDriver class, if the driver is not added, create the driver
             Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

                         //2- Get connection with data source
            con = DriverManager.getConnection(url);

                         //3- Create a Statement object to send SQL statements to the database
            stmt = con.createStatement();

                         //4- SQL statement
            String SQL = "SELECT  * FROM Stu";

                         //5-Execute SQL, return data
            rs = stmt.executeQuery(SQL);

                         //6-traversal
            while (rs.next()) {

                System.out.println(rs.getString(1) + "," + rs.getString(2).trim()+"," + rs.getString(3));
            }
        }

        catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (rs != null)
                try {
                    rs.close();
                } catch (Exception e) {
                }
            if (stmt != null)
                try {
                    stmt.close();
                } catch (Exception e) {
                }
            if (con != null)
                try {
                    con.close();
                } catch (Exception e) {
                }
        }
    }
} 

There is only one record in my database, containing (ID, name, age). Output result:

Five, there is an error

If it appearsException in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/DatatypeConverter。

Download javax.xml.bind.jar,http://www.java2s.com/Code/Jar/j/Downloadjavaxxmlbindjar.htm。After decompression, put the file in(D:\IntelliJ IDEA 2019.2.3\jbr) and import the package again.