我正在尝试使用 JDBC 驱动程序连接到 Netezza 数据库并执行简单的 SELECT 查询。我的项目（使用 Eclipse）的 lib 文件夹中有 nzjdbc.jar 文件，但出现以下错误。
java.lang.ClassNotFoundException: org.netezza.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
这是我的代码：
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Tests {
public static void main(String[] args)
{
String server = "myhost.com";
String port = "5480";
String dbName = "dbname";
String url = "jdbc:netezza://" + server + "/" + dbName ;
String user = "user";
String pwd = "pwd";
Connection conn = null;
Statement st = null;
ResultSet rs = null;
try {
Class.forName("org.netezza.Driver");
System.out.println(" Connecting ... ");
conn = DriverManager.getConnection(url, user, pwd);
System.out.println(" Connected "+conn);
String sql = "SELECT COUNT(*) FROM TABLE";
st = conn.createStatement();
rs = st.executeQuery(sql);
if(rs.next()) {
System.out.println(rs.getString(1));
} else {
System.out.println(" No data found");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if( rs != null)
rs.close();
if( st!= null)
st.close();
if( conn != null)
conn.close();
} catch (SQLException e1) {
e1.printStackTrace();
}
}
}
}