From 4aec2755f18fc864ecddd782ae65e9f6f0b4a7f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=91=A8=E4=BA=9A=E8=BE=89?= <3192667214@qq.com>
Date: Wed, 17 May 2023 13:25:02 +0000
Subject: [PATCH] =?UTF-8?q?41=20=E5=91=A8=E4=BA=9A=E8=BE=89?=
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Signed-off-by: 周亚辉 <3192667214@qq.com>
---
 .../20230517 JDBC\344\275\234\344\270\232.md" | 151 ++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 "41 \345\221\250\344\272\232\350\276\211/20230517 JDBC\344\275\234\344\270\232.md"

diff --git "a/41 \345\221\250\344\272\232\350\276\211/20230517 JDBC\344\275\234\344\270\232.md" "b/41 \345\221\250\344\272\232\350\276\211/20230517 JDBC\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..5f5d46e
--- /dev/null
+++ "b/41 \345\221\250\344\272\232\350\276\211/20230517 JDBC\344\275\234\344\270\232.md"	
@@ -0,0 +1,151 @@
+
+
+# 作业
+
+## mysql
+
+```mysql
+CREATE DATABASE student_db CHARSET utf8;
+use student_db;
+CREATE TABLE student(
+id int,
+name VARCHAR(20),
+sex enum('男','女'));
+INSERT into student VALUES(
+1,'张三','男'),
+(2,'李四','女'),
+(3,'王五','男');
+```
+
+## java
+
+```java
+import java.sql.*;
+import java.util.Scanner;
+
+public class test {
+    static Connection conn = null;
+    static Statement sta = null;
+    static ResultSet res = null;
+
+    static Scanner sc = new Scanner(System.in);
+
+    public static void main(String[] args) {
+        try {
+            OUT:
+            while (true) {
+                Class.forName("com.mysql.jdbc.Driver");
+                conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8", "root", "root");
+                sta = conn.createStatement();
+                System.out.println("1. 查询功能\n2. 添加功能\n3. 修改功能\n4. 删除功能\n退出");
+                System.out.println("输入");
+                int i = sc.nextInt();
+                switch (i) {
+                    case 1:
+                        select(sta);
+                        break;
+                    case 2:
+                        add(sta);
+                        break;
+                    case 3:
+                        update(sta);
+                        break;
+                    case 4:
+                        delete(sta);
+                        break;
+                    case 5:
+                        break OUT;
+                }
+            }
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                sta.close();
+                conn.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    private static void delete(Statement sta) {
+        try {
+            int a = sta.executeUpdate("delete from student where id=3");
+            if (a > 0) {
+                System.out.println("ok");
+            } else {
+                System.out.println("no");
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+
+        }
+    }
+
+    private static void update(Statement sta) {
+        try {
+            int a = sta.executeUpdate("update student set name='张二' where id=1");
+            if (a > 0) {
+                System.out.println("ok");
+            } else {
+                System.out.println("no");
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+
+        }
+    }
+
+    private static void add(Statement sta) {
+        try {
+            int a = sta.executeUpdate("INSERT into student VALUES(1,'小明','男')");
+            if (a > 0) {
+                System.out.println("ok");
+            } else {
+                System.out.println("no");
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } finally {
+
+        }
+    }
+
+    static void select(Statement sta) {
+        try {
+            res = sta.executeQuery("select * from student;");
+            while (res.next()) {
+                System.out.println(res.getInt("id") + res.getString("name") + res.getString("sex"));
+            }
+        } catch (SQLException e) {
+
+        } finally {
+            try {
+                res.close();
+            } catch (SQLException e) {
+
+            }
+        }
+    }
+}
+
+class stu {
+    int id;
+    String name;
+    String sex;
+
+    @Override
+    public String toString() {
+        return "id=" + id +
+                " name='" + name +
+                " sex='" + sex;
+    }
+}
+
+```
+
-- 
Gitee