From e8c2e04e7a8984305de8a03539ec36ac8e962b9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?5=E5=8F=B7=E6=9E=97=E4=BC=9F=E5=BD=AC?= <2401916501@qq.com>
Date: Sun, 21 May 2023 23:54:27 +0800
Subject: [PATCH] zuoye

---
 .../20230520 \344\275\234\344\270\232.md"     | 116 ++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 "05 \346\236\227\344\274\237\345\275\254/20230520 \344\275\234\344\270\232.md"

diff --git "a/05 \346\236\227\344\274\237\345\275\254/20230520 \344\275\234\344\270\232.md" "b/05 \346\236\227\344\274\237\345\275\254/20230520 \344\275\234\344\270\232.md"
new file mode 100644
index 0000000..1bd9f2b
--- /dev/null
+++ "b/05 \346\236\227\344\274\237\345\275\254/20230520 \344\275\234\344\270\232.md"	
@@ -0,0 +1,116 @@
+# 作业
+
+```java
+//JDBC工具类
+import java.sql.*;
+
+public class Jdbc {
+    //注册+连接
+    private Connection conn() {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEchoing=utf8";
+            Connection conn = DriverManager.getConnection(url, "root", "root");
+            return conn;
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+     //查询
+     ResultSet select(String sql){
+         try {
+             PreparedStatement pst = conn().prepareStatement(sql);
+             ResultSet re = pst.executeQuery();
+             return re;
+         } catch (SQLException e) {
+             throw new RuntimeException(e);
+         }
+     }
+}
+```
+
+
+
+```Java
+//学生对象
+public class Student {
+    private int id;
+    private String name;
+    private String sex;
+
+     public Student() {
+    }
+    
+     public Student(int id, String name, String sex) {
+          this.id = id;
+         this.name = name;
+         this.sex = sex;
+     }
+    
+     public int getId() {
+         return id;
+     }
+    
+     public void setId(int id) {
+         this.id = id;
+     }
+    
+     public String getName() {
+         return name;
+     }
+    
+     public void setName(String name) {
+         this.name = name;
+     }
+    
+      public String getSex() {
+         return sex;
+     }
+    
+     public void setSex(String sex) {
+         this.sex = sex;
+     }
+
+}
+```
+
+
+
+```java
+
+
+//测试类
+import java.sql.*;
+import java.util.ArrayList;
+
+public class Test {
+    public static void main(String[] args) {
+        Jdbc jdbc = new Jdbc();
+        ResultSet re = jdbc.select("select * from student");
+        ArrayList<Student> stu = new ArrayList<>();
+        try {
+            while (re.next()) {
+                int id = re.getInt(1);
+                String name = re.getString(2);
+                String sex = re.getString(3);
+                Student s = new Student(id, name, sex);
+                stu.add(s);
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+         System.out.println("ID\t\t姓名\t\t性别");
+         for (int i = 0; i < stu.size(); i++) {
+             Student s = stu.get(i);
+             System.out.println(s.getId()+"\t\t"+s.getName()+"\t\t"+s.getSex());
+         }
+     }
+}
+
+
+```
+
-- 
Gitee