diff --git "a/05 \346\236\227\344\274\237\345\275\254/20230517 JDBC\345\237\272\347\241\200\344\275\234\344\270\232 .md" "b/05 \346\236\227\344\274\237\345\275\254/20230517 JDBC\345\237\272\347\241\200\344\275\234\344\270\232 .md"
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@@ -0,0 +1,174 @@
+# 作业
+
+### 查询
+
+```java
+import java.sql.*;
+public class select {
+    public static void main(String[] args) {
+        try {
+            //1.注册驱动
+            Class.forName("com.mysql.jdbc.Driver");
+            //2.连接对象
+            String url ="jdbc:mysql://localhost:3306/user?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username="root";
+            String password="root";
+            Connection conn = DriverManager.getConnection(url, username, password);
+            //3.定义Sql语句
+            String sql="select * from  sysy";
+            //4.获取执行SQL语句的对象
+            Statement st = conn.createStatement();
+            //5.执行SQL
+            ResultSet rs = st.executeQuery(sql);
+            //6.处理返回的结果
+            while (rs.next()){
+                //rs结果中有，三个字段 id name money
+                System.out.println(rs.getInt("编号")+
+                        "\t"+ rs.getString("姓名")+
+                        "\t"+rs.getInt("工资"));
+            }
+            //7.释放资源
+            st.close();
+            rs.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+
+```
+
+### 修改
+
+```java
+import java.sql.*;
+
+public class update {
+    public static void main(String[] args) {
+        try {
+            //1.注册驱动
+            Class.forName("com.mysql.jdbc.Driver");
+            //2.连接对象
+            String url ="jdbc:mysql://localhost:3306/user?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username="root";
+            String password="root";
+            Connection conn = DriverManager.getConnection(url, username, password);
+            //3.定义Sql语句
+            String sql="UPDATE sysy SET 姓名='小臂崽子'where 编号=5";
+            //4.获取执行SQL语句的对象
+            Statement st = conn.createStatement();
+            //5.执行SQL
+            int rs = st.executeUpdate(sql);
+            //6.处理返回的结果
+           if (rs>0){
+               System.out.println("修改成功-------------------------");
+           }else {
+               System.out.println("修改失败-------------------------");
+           }
+            //7.释放资源
+            st.close();
+            conn.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+}
+
+```
+
+### 增加
+
+```java
+import java.sql.*;
+
+public class insert {
+    public static void main(String[] args) {
+        try {
+            //1.注册驱动
+            Class.forName("com.mysql.jdbc.Driver");
+            //2.连接对象
+            String url = "jdbc:mysql://localhost:3306/user?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username = "root";
+            String password = "root";
+            Connection conn = DriverManager.getConnection(url, username, password);
+            //3.定义Sql语句
+            String sql = "insert into sysy values(6,'小鸡崽子',2000) ";
+            //4.获取执行SQL语句的对象
+            Statement st = conn.createStatement();
+            //5.执行SQL
+            int  rs = st.executeUpdate(sql);
+
+            //6.处理返回的结果
+
+            if (rs>0){
+                System.out.println("添加成功-----------------------");
+            }else {
+                System.out.println("添加失败------------------------");
+
+            }
+
+            //7.释放资源
+            st.close();
+            conn.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    }
+
+
+
+
+```
+
+### 删除
+
+```java
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class delete {
+    public static void main(String[] args) {
+        try {
+            //1.注册驱动
+            Class.forName("com.mysql.jdbc.Driver");
+            //2.连接对象
+            String url ="jdbc:mysql://localhost:3306/user?useSSL=false&useUnicode=true&characterEncoding=utf8";
+            String username="root";
+            String password="root";
+            Connection conn = DriverManager.getConnection(url, username, password);
+            //3.定义Sql语句
+            String sql="DELETE FROM sysy WHERE 编号=6";
+            //4.获取执行SQL语句的对象
+            Statement st = conn.createStatement();
+            //5.执行SQL
+            int rs = st.executeUpdate(sql);
+            //6.处理返回的结果
+            if (rs>0){
+                System.out.println("删除成功-------------------------");
+            }else {
+                System.out.println("删除失败-------------------------");
+            }
+            //7.释放资源
+            st.close();
+            conn.close();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+}
+
+```
+