import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;
object TestAppMain {
def main(args: Array[String]) {
val url = "jdbc:mysql://localhost/scala"
val username = "root"
val password = "abc123"
// there's probably a better way to do this
var connection:Connection = null
try {
// make the connection
**Class.forName("com.mysql.jdbc.Driver")**
connection = DriverManager.getConnection(url, username, password)
// create the statement, and run the select query
val statement = connection.createStatement()
val resultSet = statement.executeQuery("SELECT host, user FROM fra1")
while ( resultSet.next() ) {
val host = resultSet.getString("host")
val user = resultSet.getString("user")
println("host, user = " + host + ", " + user)
}
} catch {
case e => e.printStackTrace
}
**connection.close()**
}
}
我在“** **”包围的行中收到错误,但在“com.mysql.jdbc.Driver”中收到主要错误,那么如何解决该错误?我有一个名为 scala 的数据库和一个名为 fra1 的表,我创建了一个名为 scala 的数据库并在 mysql 中创建了一个表
mysql> create table fra1(host varchar(64),user varchar(64));
Query OK, 0 rows affected (0.39 sec)
mysql> select* from fra1;
Empty set (0.00 sec)
mysql> insert into fra1 values('rohit1' ,'xyz123');
Query OK, 1 row affected (0.05 sec)
mysql> insert into fra1 values('rohit' ,'abc123');
Query OK, 1 row affected (0.05 sec)
mysql> select* from fra1;
+--------+--------+
| host | user |
+--------+--------+
| rohit1 | xyz123 |
| rohit | abc123 |
+--------+--------+
2 rows in set (0.00 sec)