JDBC连接数据库--入门

本实例使用的是MS SQL Server 2000.它的功能是从pubs数据库里的titles表中读取所有著作的title(标题)和price(价格),并在控制台显示出来!

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class SimpleJDBCTest {

public static final String url = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=pubs";

public static final String drivername = "com.microsoft.jdbc.sqlserver.SQLServerDriver";

public static final String user = "sa";

public static final String password = "sa";

public static void main(String[] args) {
String sql = "select title,price from titles";
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
try {
Class.forName(drivername);
System.out.println("加载驱动成功！");
connection = DriverManager.getConnection(url, user, password);
System.out.println("连接数据库成功！");
statement = connection.createStatement();
resultSet = statement.executeQuery(sql);
while (resultSet.next()) {
System.out.println("书名：" + resultSet.getString("title") + "定价："
+ resultSet.getDouble("price"));
}
resultSet.close();
statement.close();
connection.close();

} catch (Exception e) {
e.printStackTrace(System.out);
} finally {
try {
if (resultSet != null) {
resultSet.close();
}
} catch (Exception e) {
System.err.println("关闭ResultSet时发生异常！");
}
try {
if (statement != null) {
statement.close();
}
} catch (Exception e) {
System.err.println("关闭statement时发生异常！");
}
try {
if (connection != null) {
connection.close();
}
} catch (Exception e) {
System.err.println("关闭connection时发生异常！");
}
}
}
}