题目简述:
向数据表中添加学生信息，并且可以通过身份证号准考证来查询学生信息。
Name Type Nullable Default Comments
----------- ------------ -------- ------- --------
IDCARD NUMBER(10) Y
EXAMCARD NUMBER(10) Y
STUDENTNAME VARCHAR2(20) Y
LACATION VARCHAR2(20) Y
GRADE NUMBER(3) Y
测试类
package xuezaipiao3;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Scanner;
import xuezaipiao1.JDBC_Tools;
/**
* 思考：
* 向数据表中添加一条学生信息记录，那么学生信息就可以创建一个学生类来储存信息
* 步骤：
* 1) Student成员变量 对应studnt数据表
* 2) 创建一个方法addStudent(Student student)
* 3) 方法中执行相应的 SQL 操作
* @author Kevy
*
*/
public class thinkInJDBC {
public static void main(String[] args) {
Student s = getStudentFromConsole();
addStudent(s);
QueryStudent();
}
public static void QueryStudent(){
int searchType = getSearchTypeFromConsole();
Student student = searchStudent(searchType);
printStudent(student);
}
/**
* 打印学生信息
* @param student
*/
private static void printStudent(Student student) {
if(student!=null){
System.out.println(student);
}else{
System.out.println("查无此人!");
}
}
/**
*
* @param searchType 1 And 2
* @return
*/
private static Student searchStudent(int searchType) {
String sql = "SELECT * FROM student "
+ "where ";
Scanner scanner = new Scanner(System.in);
if(searchType==1){
System.out.print("请输入身份证:");
int id = scanner.nextInt();
sql = sql + "IDCARD = " +id;
}else{
System.out.print("请输入准考证:");
int id = scanner.nextInt();
sql = sql + "EXAMCARD = " +id;
}
Student student = getStudent(sql);
scanner.close();
return student;
}
/**
* 根据传入的sql返回Student对象
* @param sql
* @return
*/
private static Student getStudent(String sql) {
Connection connection = null;
Statement statement = null;
ResultSet rs = null;
Student stu = null;
try {
connection = JDBC_Tools.getConnection();
statement = connection.createStatement();
rs = statement.executeQuery(sql);
if(rs.next()){
stu = new Student(rs.getInt("IDCARD"),
rs.getInt("EXAMCARD"),rs.getString("STUDENTNAME"),
rs.getString("LACATION"),rs.getInt("GRADE"));
}
} catch (Exception e) {
e.printStackTrace();
}finally{
JDBC_Tools.relaseSource(rs, connection, statement);
}
return stu;
}
/**
*
* @return 1 用身份证查询 ， 2 用准考证号查询 其他无效
*/
@SuppressWarnings("resource")
private static int getSearchTypeFromConsole() {
System.out.println("请输入查询类型:1.身份证查询 2.准考证查询");
System.out.print("你的选择:");
Scanner scanner = new Scanner(System.in);
int type = scanner.nextInt();
if(type!=1 && type!=2){
System.out.println("输入有误,请重新输入");
throw new RuntimeException();
}
scanner.close();
return 0;
}
/**
* 从控制台获取信息 并创建学生对象
* @return
*/
private static Student getStudentFromConsole() {
Scanner scanner = new Scanner(System.in);
Student student = new Student();
System.out.print("IDCard:");
student.setIDCard(scanner.nextInt());
System.out.print("ExamID:");
student.setExamID(scanner.nextInt());
System.out.print("StudentName:");
student.setStudentName(scanner.next());
System.out.print("Llocation:");
student.setLacation(scanner.next());
System.out.print("Grade:");
student.setGrade(scanner.nextInt());
scanner.close();
return student;
}
/**
* 添加学生信息
* @param student
*/
public static void addStudent(Student student){
String sql = "INSERT INTO STUDENT "
+ "VALUES("+student.getIDCard()
+","+student.getExamID()
+",'"+student.getStudentName()
+"','"+student.getLacation()
+"',"+student.getGrade()
+")";
JDBC_Tools.update(sql);
}
}
Student类
public class Student {
private int IDCard;
private int ExamID;
private String StudentName;
private String Lacation;
private int Grade;
public Student(int iDCard, int examID, String studentName, String lacation,
int grade) {
super();
IDCard = iDCard;
ExamID = examID;
StudentName = studentName;
Lacation = lacation;
Grade = grade;
}
@Override
public String toString() {
return "Student [IDCard=" + IDCard + ", ExamID=" + ExamID
+ ", StudentName=" + StudentName + ", Lacation=" + Lacation
+ ", Grade=" + Grade + "]";
}
public Student() {
super();
}
public int getIDCard() {
return IDCard;
}
public void setIDCard(int iDCard) {
IDCard = iDCard;
}
public int getExamID() {
return ExamID;
}
public void setExamID(int examID) {
ExamID = examID;
}
public String getStudentName() {
return StudentName;
}
public void setStudentName(String studentName) {
StudentName = studentName;
}
public String getLacation() {
return Lacation;
}
public void setLacation(String lacation) {
Lacation = lacation;
}
public double getGrade() {
return Grade;
}
public void setGrade(int grade) {
Grade = grade;
}
}
JDBC工具类
package xuezaipiao1;
/**
* JDBC工具类
* 封装一些简单的JDBC操作方法
* version 1
*/
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
public class JDBC_Tools {
/**
* 用来执行 SQL 的方法，包括INSRT , UPDATE , DELETE,不包含SELECT
* 参数 String SQL语句
* @return int 执行了几条记录
*/
public static int update(String sql){
Connection conn = null;
Statement statement = null;
int num = 0;
try {
try {
conn = JDBC_Tools.getConnection();
} catch (Exception e) {
e.printStackTrace();
}
statement = conn.createStatement();
num = statement.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
}finally{
JDBC_Tools.relaseSource(conn, statement);
}
return num;
}
/**
* 用来执行 SQL 的SELECT 方法
*/
public static void query(String sql){
Connection conn = null;
Statement statement = null;
ResultSet rs = null;
try {
conn = JDBC_Tools.getConnection();
statement = conn.createStatement();
rs = statement.executeQuery(sql);
while(rs.next()){
System.out.println(rs.getInt("id"));
System.out.println(rs.getString(2));
System.out.println(rs.getString("email"));
}
} catch (Exception e) {
e.printStackTrace();
}finally{
JDBC_Tools.relaseSource(rs, conn, statement);
}
}
/**
* 用来释放资源，参数是 Connection 、 Statement
* @param conn
* @param statement
*/
public static void relaseSource(ResultSet rs,Connection conn ,Statement statement){
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
JDBC_Tools.relaseSource(conn, statement);
}
public static void relaseSource(Connection conn ,Statement statement){
if(statement!=null){
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
//使用两个 if ，这样即使中间出现异常，程序还是继续执行下去
if(conn!=null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
/**
*
* @return
* @throws Exception
*/
public static Connection getConnection() throws Exception {
Properties properties = new Properties();
try {
// InputStream in = getClass().getClassLoader().getResourceAsStream("jdbc.properties");
// properties.load(in);
properties.load(new FileInputStream(
"D://LearnJava//learnJDBC//Lesson2_UseStatementAndResultSet//src//jdbc.properties"));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
String user = properties.getProperty("user");
String password = properties.getProperty("password");
String jdbcUrl = properties.getProperty("jdbcUrl");
String dirverName = properties.getProperty("driver");
try {
Class.forName(dirverName);
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
}
Connection connection = null;
try {
connection = DriverManager.getConnection(jdbcUrl, user, password);
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
}
时间： 2024-10-27 07:54:51