java - : No suitable driver found for jdbc:mysql://localhost:3306/sampledb如何解决

Question

No suitable driver found for jdbc:mysql://localhost:3306/sampledb
        at java.sql/java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql/java.sql.DriverManager.getConnection(Unknown Source)
        at MySQLConnectExample2.main(MySQLConnectExample2.java:21)

我收到这个错误，这是我的 java 代码

String url1 = "jdbc:mysql://localhost:3306/sampledb";
String user = "root";
String password = "14701";

conn1 = DriverManager.getConnection(url1, user, password);
if (conn1 != null) {
    System.out.println("Connected to the database test1");
}

每次执行

java -cp mysql-connector-java-5.1.21-bin.jar;. MySQLConnectExample

在 cmd 上发生以下错误

Answer 1

您需要在获得连接之前加载类驱动程序:

Class.forName("com.mysql.jdbc.Driver").newInstance();

Here是一个例子。

和工作代码:

Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            conn = DriverManager.getConnection("jdbc:mysql://localhost/sampledb?" + "user=root&password=14701");
        } catch (SQLException ex) {
            System.out.println("SQLException: " + ex.getMessage());
            System.out.println("SQLState: " + ex.getSQLState());
            System.out.println("VendorError: " + ex.getErrorCode());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }