我正在尝试编写一个程序以在 eclipse 中连接到 MySQL 数据库，但我收到错误"java.sql.SQLException: No proper driver found"。
java代码是：
import java.sql.*;
public class FirstExample {
//static final String S_JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String S_DB_URL = "jdbc:mysql://localhost:3306/emp";
static final String S_USER = "root";
static final String S_PASS = "root";
public static void main(String[] args) {
try {
System.out.println("Connecting to database...");
//Class.forName(S_JDBC_DRIVER);
Connection connection = DriverManager.getConnection(S_DB_URL,
S_USER, S_PASS);
System.out.println("Creating statement...");
Statement statement = connection.createStatement();
String sql = "SELECT * FROM Employee";
ResultSet resultSet = statement.executeQuery(sql);
while (resultSet.next()) {
int iId = resultSet.getInt("id");
int iAge = resultSet.getInt("age");
String sFirst = resultSet.getString("fname");
String sLast = resultSet.getString("lname");
System.out.print("ID: " + iId);
System.out.print("\tAge: " + iAge);
System.out.print("\tFirst: " + sFirst);
System.out.println("\tLast: " + sLast);
}
resultSet.close();
statement.close();
connection.close();
} catch (SQLException se) {
for (Throwable t : se) {
t.printStackTrace();
}
}
System.out.println("Goodbye!");
}
}
控制台选项卡中的输出是：
Connecting to database...
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/emp
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at FirstExample.main(FirstExample.java:21)
Goodbye!
我使用了 MySQL 连接器/J。解压到 MySQL 安装目录，jar 文件添加到 CLASSPATH。
另请参阅此图像。有一个 ！标记在项目根目录。image01
当我包含 2 个注释语句时，我得到如下图所示的错误：image02 ：
static final String S_JDBC_DRIVER = "com.mysql.jdbc.Driver";
Class.forName(S_JDBC_DRIVER);