commit ffdf7dd1cd5160109fcce2cd621ea53797a8fe09 Author: zyx <1029606625@qq.com> Date: Fri Nov 11 00:25:03 2022 +0800 2022/11/11 00:23 完成第11周作业题1 diff --git a/.idea/.gitignore b/.idea/.gitignore new file mode 100644 index 0000000..35410ca --- /dev/null +++ b/.idea/.gitignore @@ -0,0 +1,8 @@ +# 默认忽略的文件 +/shelf/ +/workspace.xml +# 基于编辑器的 HTTP 客户端请求 +/httpRequests/ +# Datasource local storage ignored files +/dataSources/ +/dataSources.local.xml diff --git a/.idea/compiler.xml b/.idea/compiler.xml new file mode 100644 index 0000000..2d3485b --- /dev/null +++ b/.idea/compiler.xml @@ -0,0 +1,14 @@ + + + + + + + + + + + + + + \ No newline at end of file diff --git a/.idea/encodings.xml b/.idea/encodings.xml new file mode 100644 index 0000000..aa00ffa --- /dev/null +++ b/.idea/encodings.xml @@ -0,0 +1,7 @@ + + + + + + + \ No newline at end of file diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml new file mode 100644 index 0000000..abb532a --- /dev/null +++ b/.idea/jarRepositories.xml @@ -0,0 +1,20 @@ + + + + + + + + + + + \ No newline at end of file diff --git a/.idea/misc.xml b/.idea/misc.xml new file mode 100644 index 0000000..132404b --- /dev/null +++ b/.idea/misc.xml @@ -0,0 +1,14 @@ + + + + + + + + + + \ No newline at end of file diff --git a/.idea/vcs.xml b/.idea/vcs.xml new file mode 100644 index 0000000..94a25f7 --- /dev/null +++ b/.idea/vcs.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/pom.xml b/pom.xml new file mode 100644 index 0000000..511e831 --- /dev/null +++ b/pom.xml @@ -0,0 +1,30 @@ + + + 4.0.0 + + cn.czyx007.week11 + week11-work1 + 1.0-SNAPSHOT + + + 8 + 8 + UTF-8 + + + + + mysql + mysql-connector-java + 8.0.30 + + + org.projectlombok + lombok + 1.18.20 + + + + \ No newline at end of file diff --git a/src/main/java/cn/czyx007/week11/Driver.java b/src/main/java/cn/czyx007/week11/Driver.java new file mode 100644 index 0000000..7b7bcf4 --- /dev/null +++ b/src/main/java/cn/czyx007/week11/Driver.java @@ -0,0 +1,49 @@ +package cn.czyx007.week11; + +import cn.czyx007.week11.bean.Student; +import cn.czyx007.week11.dao.impl.StudentDAOImpl; +import cn.czyx007.week11.utils.DBUtil; + +import java.sql.Connection; +import java.text.SimpleDateFormat; +import java.util.Date; +import java.util.Scanner; + +/** + * @author : 张宇轩 + * @createTime : 2022/11/10 + */ +public class Driver { + public static void main(String[] args) { + Scanner scanner = new Scanner(System.in); + StudentDAOImpl studentDAO = new StudentDAOImpl(); + Connection connection = null; + try { + connection = DBUtil.getConnection(); + connection.setAutoCommit(false); + connection.commit(); + //输入学生各项信息，保存到数据库 + System.out.print("请输入待添加学生的学号："); + String id = scanner.nextLine(); + System.out.print("请输入待添加学生的姓名："); + String name = scanner.nextLine(); + System.out.print("请输入待添加学生的性别："); + String gender = scanner.nextLine(); + System.out.print("请输入待添加学生的出生年月日(yyyy-MM-dd)："); + Date birth = new SimpleDateFormat("yyyy-MM-dd").parse(scanner.nextLine()); + System.out.print("请输入待添加学生的成绩："); + Double score = Double.valueOf(scanner.nextLine()); + studentDAO.insert(new Student(id, name, gender, birth, score)); + System.out.println("添加成功！"); + + // 输入学生学号，查询显示该学号学生的所有记录 + System.out.println("请输入待查询学生的学号："); + id = scanner.nextLine(); + System.out.println(studentDAO.selectById(id)); + } catch (Exception e){ + e.printStackTrace(); + } finally { + DBUtil.close(connection, null, null); + } + } +} diff --git a/src/main/java/cn/czyx007/week11/bean/Student.java b/src/main/java/cn/czyx007/week11/bean/Student.java new file mode 100644 index 0000000..48a1ed0 --- /dev/null +++ b/src/main/java/cn/czyx007/week11/bean/Student.java @@ -0,0 +1,22 @@ +package cn.czyx007.week11.bean; + +import lombok.AllArgsConstructor; +import lombok.Data; +import lombok.NoArgsConstructor; + +import java.util.Date; + +/** + * @author : 张宇轩 + * @createTime : 2022/11/9 + */ +@NoArgsConstructor +@AllArgsConstructor +@Data +public class Student { + private String id; + private String name; + private String gender; + private Date birth; + private Double score; +} diff --git a/src/main/java/cn/czyx007/week11/dao/StudentDAO.java b/src/main/java/cn/czyx007/week11/dao/StudentDAO.java new file mode 100644 index 0000000..90c9075 --- /dev/null +++ b/src/main/java/cn/czyx007/week11/dao/StudentDAO.java @@ -0,0 +1,13 @@ +package cn.czyx007.week11.dao; + +import cn.czyx007.week11.bean.Student; + +/** + * @author : 张宇轩 + * @createTime : 2022/11/9 + */ +public interface StudentDAO { + int insert(Student student); + + Student selectById(String id); +} diff --git a/src/main/java/cn/czyx007/week11/dao/impl/StudentDAOImpl.java b/src/main/java/cn/czyx007/week11/dao/impl/StudentDAOImpl.java new file mode 100644 index 0000000..43235cc --- /dev/null +++ b/src/main/java/cn/czyx007/week11/dao/impl/StudentDAOImpl.java @@ -0,0 +1,66 @@ +package cn.czyx007.week11.dao.impl; + +import cn.czyx007.week11.bean.Student; +import cn.czyx007.week11.dao.StudentDAO; +import cn.czyx007.week11.utils.DBUtil; + +import java.sql.Connection; +import java.sql.Date; +import java.sql.PreparedStatement; +import java.sql.ResultSet; + +/** + * @author : 张宇轩 + * @createTime : 2022/11/9 + */ +public class StudentDAOImpl implements StudentDAO { + @Override + public int insert(Student student) { + Connection connection = null; + PreparedStatement ps = null; + int count = 0; + try { + connection = DBUtil.getConnection(); + String sql = "insert into tstudent values(?,?,?,?,?)"; + ps = connection.prepareStatement(sql); + ps.setObject(1, student.getId()); + ps.setObject(2, student.getName()); + ps.setObject(3, student.getGender()); + ps.setObject(4, student.getBirth()); + ps.setObject(5, student.getScore()); + count = ps.executeUpdate(); + } catch (Exception e){ + e.printStackTrace(); + } finally { + DBUtil.close(null, ps, null); + } + return count; + } + + @Override + public Student selectById(String id) { + Connection connection = null; + PreparedStatement ps = null; + ResultSet rs = null; + Student student = null; + try { + connection = DBUtil.getConnection(); + String sql = "select * from tstudent where id = ?"; + ps = connection.prepareStatement(sql); + ps.setObject(1, id); + rs = ps.executeQuery(); + if(rs.next()){ + String name = rs.getString("name"); + String gender = rs.getString("gender"); + Date birth = rs.getDate("birth"); + double score = rs.getDouble("score"); + student = new Student(id, name, gender, birth, score); + } + } catch (Exception e){ + e.printStackTrace(); + } finally { + DBUtil.close(null, ps, rs); + } + return student; + } +} diff --git a/src/main/java/cn/czyx007/week11/utils/DBUtil.java b/src/main/java/cn/czyx007/week11/utils/DBUtil.java new file mode 100644 index 0000000..a43e7b4 --- /dev/null +++ b/src/main/java/cn/czyx007/week11/utils/DBUtil.java @@ -0,0 +1,70 @@ +package cn.czyx007.week11.utils; + +import java.sql.*; +import java.util.ResourceBundle; + +/** + * @author : 张宇轩 + * @createTime : 2022/11/9 + */ +public class DBUtil { + //服务器上只会有一个ThreadLocal，每个线程向其中绑定自己的数据(连接对象) + private static ThreadLocal local = new ThreadLocal<>(); + + private static ResourceBundle bundle = ResourceBundle.getBundle("jdbc"); + private static String driver = bundle.getString("driver"); + private static String url = bundle.getString("url"); + private static String username = bundle.getString("username"); + private static String password = bundle.getString("password"); + + //不让创建对象，因为工具类中的方法都是静态的，不需要创建对象 + private DBUtil(){} + + //DBUtil类加载时注册驱动 + static { + try { + Class.forName(driver); + } catch (ClassNotFoundException e) { + e.printStackTrace(); + } + } + + /** + * 没有使用数据库连接池，直接创建连接对象 + * @return 连接对象 + * @throws SQLException + */ + public static Connection getConnection() throws SQLException { + Connection connection = local.get(); + if (connection == null) { + connection = DriverManager.getConnection(url,username,password); + local.set(connection); + } + return connection; + } + + public static void close(Connection connection, PreparedStatement ps, ResultSet rs){ + if (connection != null) { + try { + connection.close(); + local.remove(); + } catch (SQLException e) { + e.printStackTrace(); + } + } + if (ps != null) { + try { + ps.close(); + } catch (SQLException e) { + e.printStackTrace(); + } + } + if (rs != null) { + try { + rs.close(); + } catch (SQLException e) { + e.printStackTrace(); + } + } + } +} diff --git a/src/main/resources/jdbc.properties b/src/main/resources/jdbc.properties new file mode 100644 index 0000000..cb8557d --- /dev/null +++ b/src/main/resources/jdbc.properties @@ -0,0 +1,4 @@ +driver=com.mysql.cj.jdbc.Driver +url=jdbc:mysql://localhost:3306/mis?serverTimezone=UTC +username=root +password=123456 \ No newline at end of file