Database별 JDBC드라이버 URL
오라클
oracle.jdbc.driver.OracleDriver
jdbc:oracle:thin:@localhost:1521:ora92
MYSQL
com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/practice
MSSQL
com.microsoft.jdbc.sqlserver.SQLServerDriver
jdbc:microsoft:sqlserver://localhost:1433;databaseName=practice