A separate Java program connects to the MySQL database.

Today, I met a friend in the group and asked how to use a separate JavaProgramConnect to the MySQL database. Or any other database. I did not write this during my studies.CodeAre written in eclipse or myeclipse. Copy the jar package from the database to the Lib under the project, and then introduce it.
Today, I will write a simple Java file connecting to MySQL using Java. The result shows that the connection fails because the driver jar package cannot be found. Then, of course, I went to Google's boss and soon found the relevant instructions and documents. Then I passed the test myself. Therefore, write down your own simple feelings for future reference or for beginners who are new to Java to connect to the database.

 

Steps:

1. Download and install MySQL

2. Download the MySQL driver jar package. My version is:Mysql-connector-java-5.1.10-bin.jar

3. Copy the jar package file above to the JDK installation directory,D:/program files/Java/jdk1.6.0 _ 23/JRE/lib/EXT
Below, my installation directory is d disk, and other disks are similar.

4. Modify the environment variable classpath and add the following content:; D:/program files/Java/jdk1.6.0 _ 23/JRE/lib/EXT/mysql-connector-java-5.1.10-bin.jar,

That is, the name of the jar package directory and jar package file.
5. write code Test

The Code is as follows:

/** <Br/> * separate Java programs connect to the MySQL database <br/> * Author: javaalpha <br/> * Date: 20:48:28 <br/> * ide: e-Editor Version 9.16 <br/> */<br/> Import Java. SQL. *; <br/> public class test {<br/> Public static void main (string [] ARGs) {<br/> string driver = "com. mySQL. JDBC. driver "; <br/> string url =" JDBC: mysql: // FIG: 3306/test "; <br/> string user =" root "; <br/> string Password = "123456"; <br/> try {<br /> Class. forname (driver); <br/> connection conn = drivermanager. getconnection (URL, user, password); <br/> If (! Conn. isclosed () <br/> system. Out. println ("succeeded connecting to the database! "); <Br/> statement = Conn. createstatement (); <br/> string SQL = "select * From t_user order by id desc"; </P> <p> resultset rs = statement.exe cutequery (SQL ); <br/> string name = NULL; <br/> while (RS. next () <br/>{< br/> name = Rs. getstring ("sourse"); <br/> system. out. println (RS. getstring ("ID") + "/t" + Rs. getstring ("href") + "/t" + name + "/t" + Rs. getstring ("title") + "/t" + Rs. getstring ("time ") ); <Br/>}< br/> Rs. close (); <br/> Conn. close (); <br/>}catch (classnotfoundexception e) {<br/> system. out. println ("Sorry, can't find the driver! "); <Br/> E. printstacktrace (); <br/>} catch (sqlexception e) {<br/> E. printstacktrace (); <br/>}catch (exception e) {<br/> E. printstacktrace (); <br/>}< br/>}

Due to time constraints, errors are inevitable, and there is not much optimization and good code. Please see a lot of friends who have pointed out the errors.