如何修复:“使用池时没有找到适合jdbc:mysql:// localhost / dbname的驱动程序”错误?
作者:互联网
参见英文答案 > The infamous java.sql.SQLException: No suitable driver found 13个
我正在尝试创建与我的数据库的连接,当我使用main方法测试我的代码时,它可以无缝地工作.但是,当尝试通过Tomcat 7访问它时,它会失败并显示错误:
No suitable driver found for jdbc:mysql://localhost/dbname.
我正在使用汇集.我在WEB-INF / lib和.classpath中放入了mysql连接器(5.1.15),dbcp(1.4)和pool(1.4.5)库.我正在使用Eclipse IDE.我的数据库驱动程序代码是:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.apache.tomcat.dbcp.dbcp.ConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.DriverManagerConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.PoolingDriver;
import org.apache.tomcat.dbcp.pool.impl.GenericObjectPool;
public class DatabaseConnector {
public static String DB_URI = "jdbc:mysql://localhost/dbname";
public static String DB_USER = "test";
public static String DB_PASS = "password";
// Singleton instance
protected static DatabaseConnector _instance;
protected String _uri;
protected String _username;
protected String _password;
/**
* Singleton, so no public constructor
*/
protected DatabaseConnector(String uri, String username, String password) {
_uri = uri;
_username = username;
_password = password;
GenericObjectPool connectionPool = new GenericObjectPool(null);
ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(
_uri, _username, _password);
PoolableConnectionFactory poolableConnectionFactory =
new PoolableConnectionFactory(connectionFactory, connectionPool,
null, null, false, true);
PoolingDriver driver = new PoolingDriver();
driver.registerPool("test", connectionPool);
}
/**
* Returns the singleton instance
*/
public static DatabaseConnector getInstance() {
if (_instance == null) {
_instance = new DatabaseConnector(DB_URI, DB_USER, DB_PASS);
}
return _instance;
}
/**
* Returns a connection to the database
*/
public Connection getConnection() {
Connection con = null;
try {
con = DriverManager.getConnection("jdbc:apache:commons:dbcp:test");
} catch (SQLException e) {
throw new RuntimeException(e);
}
return con;
}
}
我的堆栈跟踪开始:
Apr 5, 2011 9:49:14 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Login] in context with path [/Project]
threw exception
java.lang.RuntimeException: java.sql.SQLException:
No suitable driver found for jdbc:mysql://localhost/dbname
导致此错误的原因是什么?
解决方法:
尝试将驱动程序jar放在服务器lib文件夹中. ($CATALINA_HOME / lib中)
我相信甚至在实例化应用程序之前就需要设置连接池. (至少这是它在Jboss中的工作方式)
标签:mysql,jdbc,tomcat7,apache-commons-dbcp 来源: https://codeday.me/bug/20190911/1804138.html