centos7安裝mysql并jdbc測(cè)試實(shí)例詳解
前言:
之前用rpm安裝方式安裝不成功,換成yum安裝之后安裝ok了,在網(wǎng)上搜索到很多的rmp安裝和tar包安裝的方式,但是是centos7.x與centos6.x做了很大的改變,可能別人的6.x不適合7.x的安裝,尤其是對(duì)于像博主一樣的新人來(lái)說(shuō),照搬教程可能導(dǎo)致安裝不成功,如果你rmp安裝失敗,那么嘗試跟著本教程來(lái)吧。
先卸載已經(jīng)存在的MySQL。
[root@shizongger bin]# rpm -qa|grep mysql [root@shizongger bin]# rpm -qa mysql [root@shizongger bin]# rpm -qa|grep -i mysql MySQL-client-5.5.54-1.el7.x86_64 [root@shizongger bin]# rpm -e --nodeps M ModemManager ModemManager-glib MySQL-client [root@shizongger bin]# rpm -e --nodeps MySQL-client
更新mysql的yum源
[root@shizongger bin]# wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm[root@shizongger bin]# rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum安裝
[root@shizongger bin]# yum install mysql-community-server
不出意外,mysql就已經(jīng)安裝成功,因?yàn)閥um安裝是傻瓜式安裝嘛,現(xiàn)在啟動(dòng)mysql服務(wù)。
[root@shizongger bin]# service mysqld start
查看mysql是否啟動(dòng),可以監(jiān)聽(tīng)它的端口號(hào),mysql監(jiān)聽(tīng)的段口號(hào)是3306,現(xiàn)在我們來(lái)監(jiān)聽(tīng)3306端口是否已經(jīng)啟動(dòng):
[shizongger@shizongger src]$ netstat -anp |grep 3306(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)tcp6 0 0 :::3306 :::* LISTEN -
mysql服務(wù)已經(jīng)起來(lái)了,可以登陸數(shù)據(jù)庫(kù)了,第一次登陸數(shù)據(jù)密碼為空,然后再去給數(shù)據(jù)庫(kù)配置root的密碼。
[root@shizongger bin]# mysql -urootmysql> set password for 'root'@'localhost' =password('root');mysql>exit
用新的密碼登陸
[root@shizongger bin]# mysql -uroot -proot mysql> show database; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'database' at line 1 mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | +--------------------+
到這里已經(jīng)成功的登陸本地?cái)?shù)據(jù)庫(kù)了,停止mysql服務(wù)的命令是:
[root@shizongger bin]# service mysqld stop
好了,本地的mysql服務(wù)已經(jīng)搭建起來(lái)了,作為一個(gè)Java程序員,那么下面請(qǐng)繼續(xù)
測(cè)試jdbc
首先需要準(zhǔn)備好jar包,mysql只需要一個(gè)jar包:mysql-connector-java-3.0.14-production-bin.jar,如果你是用vi/vim作為編輯工具,那么你的jar包需要放在jdk的lib文件夾下面,或者放在一個(gè)獨(dú)立的地方,然后將其加入classpath里面,我在centos下面用ide eclipse來(lái)開(kāi)發(fā),這里以eclipse為例子說(shuō)來(lái)(感覺(jué)自己在Linux用ide,有點(diǎn)low).復(fù)制+粘帖,放在項(xiàng)目的lib下面。接著來(lái)開(kāi)放我們的jdbc測(cè)試用例。
import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class JdbcTest { public static void main(String[] args) { Connection conn = null; Statement sm = null; ResultSet rs = null; try { Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql://localhost:3306/shopping?zeroDateTimeBehavior=convertToNull"; conn = DriverManager.getConnection(url, "root", "root"); sm = conn.createStatement(); rs = sm.executeQuery("select * from user"); while(rs.next()) { System.out.println("id:" + rs.getInt("id") + " name:" + rs.getString("name")); } } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } finally { try{ if(rs != null) { rs.close(); rs = null; } if(sm != null) { sm.close(); sm = null; } if(conn != null) { conn.close(); conn = null; } } catch(Exception e) { e.printStackTrace(); } } }}
新聞熱點(diǎn)
疑難解答
圖片精選
網(wǎng)友關(guān)注