java之jdbc_采用Statement根据条件查询

import java.sql.*;

//采用Statement根据条件查询
public class QueryTest04 {
public static void main(String[] args) {
if (args.length == 0) {
throw new IllegalArgumentException("参数非法，正确使用为： Java QueryTest04 + 参数");
}

Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
//第一步，加载数据库驱动，不同的数据库驱动程序不一样
Class.forName("oracle.jdbc.driver.OracleDriver");
//第二部，得到数据库连接
String dburl = "jdbc:oracle:thin:@localhost:1521:orcl";
//String dburl = "jdbc:oracle:thin:@192.168.21.1:1521:orcl";
//String dburl = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";
String userName = "system";
String password = "wanwan";
conn = DriverManager.getConnection(dburl, userName, password);
//System.out.println(conn);

//第三步，创建Statement，执行SQL语句
stmt = conn.createStatement();
//第四部，取得结果集
//将条件做为sql语句的一部分进行拼接
//注意字符串必须采用单引号引起来
//rs = stmt.executeQuery("select * from tb_student where sex like '" + args[0] + "'");
String sql = "select * from tb_student where sex like '" + args[0] + "'";
System.out.println("sql" + sql);
rs = stmt.executeQuery(sql);
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
System.out.println(id + " , " + name);
}

} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
//注意关闭原则：从里到外

try {
if (rs != null) {
rs.close();
}
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
} catch(SQLException e) {

}

}
}
}