Java_jdbc 基础笔记之八 数据库连接（写一个查询Student对象的方法）

public Student getStudent(String sql, Object... args) {
// 查询Student对象
Student stu = null;
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
conn = JDBCTools.getConnection();
ps = conn.prepareStatement(sql);
// 填充占位符
for (int i = 0; i < args.length; i++) {
ps.setObject(i + 1, args[i]);
}
rs = ps.executeQuery();
if (rs.next()) {
stu = new Student();
stu.setFlowId(rs.getInt(1));
stu.setType(rs.getInt(2));
stu.setiDCard(rs.getString(3));
stu.setExamCard(rs.getString(4));
stu.setStudentName(rs.getString(5));
stu.setLocation(rs.getString(6));
stu.setGrade(rs.getInt(7));

}

} catch (Exception e) {
e.printStackTrace();
} finally {
//关闭
JDBCTools.close(rs, ps, conn);
}

return stu;

}

@Test
public void testGet(){
String sql="SELECT flow_id flowId, type, id_card iDCard, "
+ "exam_card examCard, student_name studentName, "
+ "location, grade " + "FROM examstudent WHERE flow_id = ?";
Student stu=getStudent(sql,4);
System.out.println(stu);

}