From 8454aef0594f824d8f24b186ca93ca3b68fbe134 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Sun, 21 May 2023 22:56:44 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../20230521 \344\275\234\344\270\232.txt"    | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 "43 \345\272\236\346\200\235\350\277\234/20230521 \344\275\234\344\270\232.txt"

diff --git "a/43 \345\272\236\346\200\235\350\277\234/20230521 \344\275\234\344\270\232.txt" "b/43 \345\272\236\346\200\235\350\277\234/20230521 \344\275\234\344\270\232.txt"
new file mode 100644
index 0000000..b16895f
--- /dev/null
+++ "b/43 \345\272\236\346\200\235\350\277\234/20230521 \344\275\234\344\270\232.txt"	
@@ -0,0 +1,98 @@
+```java
+public class Student {
+    private int id;
+    private String name;
+    private String sex;
+
+    public Student(int id, String name, String sex) {
+        this.id = id;
+        this.name = name;
+        this.sex = sex;
+    }
+
+    public Student() {
+    }
+
+    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;
+    }
+
+    @Override
+    public String toString() {
+        return "Student{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", sex='" + sex + '\'' +
+                '}';
+    }
+}
+import java.sql.*;
+import java.util.ArrayList;
+
+public class DBUtil {
+    static {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    public static Connection getConn() throws SQLException {
+        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&character=utf8", "root", "122319");
+        return conn;
+    }
+    public static ResultSet Query(String sql,String ...keys) throws SQLException {
+        Connection conn = getConn();
+        PreparedStatement pre = conn.prepareStatement(sql);
+        for (int i = 0; i < keys.length; i++) {
+            pre.setString((i+1),keys[i]);
+        }
+        ResultSet res = pre.executeQuery();
+        return res;
+    }
+    public static void close(Connection con,PreparedStatement pre,ResultSet res) throws SQLException {
+        if(res!=null){
+            res.close();
+        }if(pre!=null){
+            pre.close();
+        }if(con!=null){
+            con.close();
+        }
+    }
+}
+class Test{
+    public static void main(String[] args) throws SQLException {
+        String sql="select * from student";
+        ResultSet res = DBUtil.Query(sql);
+        ArrayList<Student> list = new ArrayList<>();
+        while (res.next()){
+            list.add(new Student(res.getInt(1),res.getString(2),res.getString(3)));
+        }
+        for (int i = 0; i < list.size(); i++) {
+            Student student = list.get(i);
+            System.out.println(student);
+        }
+        DBUtil.close(null,null,res);
+    }
+}
+```
\ No newline at end of file
-- 
Gitee