遇到问题:
数据库连接问题;后面采用固定写法:
解决问题
/**c3p0取得数据源*/
public static DataSource getDataSource() throws Exception {
ComboPooledDataSource cpds = new ComboPooledDataSource();
cpds.setDriverClass("com.mysql.jdbc.Driver");
cpds.setJdbcUrl("jdbc:mysql://192.168.47.196:3306/test");
cpds.setUser("root");
cpds.setPassword("123456");
ComboPooledDataSource datasSource = cpds;
return datasSource;
}
监听器配置:
import java.util.Timer;
import java.util.TimerTask;
import java.util.UUID;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import cn.vote.dao.SystemDao;
public class SystemListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
SystemDao systemDao = new SystemDao();
try {
systemDao.createTable("liwen");
systemDao.init();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
try {
SystemDao systemDao = new SystemDao();
systemDao.dropTable("liwen");
} catch (Exception e) {
e.printStackTrace();
}
}
}
web.xml配置
<listener>
<listener-class>cn.xijie.listener.SystemListener</listener-class>
</listener>
Java代码
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import cn.xijie.JdbcUtil.JdbcUtil;
public class SystemDao {
//删除表
public void dropTable(String tableName) throws Exception{
QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource());
String sql = "drop table if exists " + tableName;
runner.update(sql);
}
//创建表
public void createTable(String tableName) throws Exception{
QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource());
String sql = "CREATE TABLE IF NOT EXISTS `"+tableName+"`(`runoob_id` INT UNSIGNED AUTO_INCREMENT,`runoob_title` VARCHAR(100) NOT NULL,`runoob_author` VARCHAR(40) NOT NULL,`submission_date` DATE,PRIMARY KEY ( `runoob_id` ))ENGINE=InnoDB DEFAULT CHARSET=utf8;";
runner.update(sql);
}
//初始化数据
public void init() throws Exception{
QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource());
String sql = "INSERT INTO liwen(runoob_title, runoob_author, submission_date) VALUES (\"MySQL\", \"liwen\", NOW());";
runner.update(sql);
}
}
结果:
成功
原文地址:http://blog.51cto.com/357712148/2105629
时间: 2024-10-05 23:25:25