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+# 20230517 第一次作业 JDBC
+
+## （Java连接MySQL数据库）
+
+### JDBC作业：
+
+1. MySQL中创建一个数据库student_db
+
+2. 库中创建student表
+
+3. 表中数据如下
+
+4. | 编号 | 姓名 | 性别 |
+   | ---- | ---- | ---- |
+   | 1    | 张三 | 男   |
+   | 2    | 李四 | 女   |
+   | 3    | 王五 | 男   |
+
+5. 编写java 4个类，分别实现以下功能
+
+   1. 查询功能，查询student中所有数据
+   2. 添加功能
+   3. 修改功能
+   4. 删除功能
+
+6. 扩展题【预习题】
+
+   1. 能否实现一个类中，用四个方法来实现上面4个类的功能
+   
+   2. 能否实现将查询的结果，封装成java对象
+   
+## 答案
+
+```java
+import java.sql.*;
+/*
+查询
+* */
+public class Select {
+    public static final String Driver = "com.mysql.jdbc.Driver";
+    public static final String URL = "jdbc:mysql://localhost:3306/student_db?useSSL=false";
+    public static final String user = "root";
+    public static final String password = "root";
+
+    public static void main(String[] args) {
+        try {
+            Class.forName(Driver);
+            Connection conn= DriverManager.getConnection(URL,user,password);
+//            System.out.println(conn);
+            Statement sta=conn.createStatement();
+            String sql="SELECT id,name,sex from student";
+            ResultSet resultSet = sta.executeQuery(sql);
+            while (resultSet.next()){
+                int id=resultSet.getInt("id");
+                String name=resultSet.getString("name");
+                String sex=resultSet.getString("name");
+                System.out.println("ID:"+id+"\tname："+name+"\tsex："+sex);
+
+            }
+            conn.close();
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入错误！");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误!");
+        }
+    }
+}
+```
+
+```java
+package java与数据库的连接;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+/*
+更新
+* */
+public class Update {
+    public static final String Driver = "com.mysql.jdbc.Driver";
+    public static final String URL = "jdbc:mysql://localhost:3306/student_db?useSSL=false";
+    public static final String user = "root";
+    public static final String password = "root";
+
+    public static void main(String[] args) {
+        try {
+            Class.forName(Driver);
+            Connection conn= DriverManager.getConnection(URL,user,password);
+            Statement sta=conn.createStatement();
+            String sql="update student set name='zs' where id=3";
+            int i =sta.executeUpdate(sql);
+            if (i==1) {
+                System.out.println("修改成功");
+            } else {
+                System.out.println("修改失败");
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("DriverError");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误");
+        }
+    }
+}
+```
+
+```java
+package java与数据库的连接;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+/*
+删除
+*/
+public class Delete {
+    public static final String Driver = "com.mysql.jdbc.Driver";
+    public static final String URL = "jdbc:mysql://localhost:3306/student_db?useSSL=false";
+    public static final String user = "root";
+    public static final String password = "root";
+
+    public static void main(String[] args) {
+        try {
+            Class.forName(Driver);
+            Connection conn = DriverManager.getConnection(URL, user, password);
+            Statement sta = conn.createStatement();
+            String sql = "delete from student where id=2";
+            int i = sta.executeUpdate(sql);
+            if (i == 1) {
+                System.out.println("删除成功");
+            } else {
+                System.out.println("删除失败");
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("DriverError");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误");
+        }
+
+    }
+}
+```
+
+```java
+package java与数据库的连接;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+/*
+增加
+ */
+public class Insert {
+    public static final String Driver = "com.mysql.jdbc.Driver";
+    public static final String URL = "jdbc:mysql://localhost:3306/student_db?useSSL=false";
+    public static final String user = "root";
+    public static final String password = "root";
+
+    public static void main(String[] args) {
+        try {
+            Class.forName(Driver);
+            Connection conn= DriverManager.getConnection(URL,user,password);
+            Statement sta=conn.createStatement();
+            String sql="insert into student values(4,'小明','男')";
+            int i=sta.executeUpdate(sql);
+            if (i==1) {
+                System.out.println("插入成功");
+            } else {
+                System.out.println("插入失败");
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("DeriveError");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误");
+        }
+
+    }
+}
+```
+