import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBHelper {
public Connection conn;
public Connection openConn() {
String url = "jdbc:mysql://localhost:3306/book?useUnicode=true&characterEncoding=UTF-8";
try {
if (conn==null||conn.isClosed()) {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, "root", "123");
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
public void closeConn() {
try {
if (conn!=null&&!conn.isClosed()) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
MySql連接數據庫
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