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+## 作业
+
+## 数据库代码
+
+```mysql
+create database student_db CHARSET utf8;
+use student_db;
+CREATE table studen(
+	id int,
+	name varchar(10),
+	sex enum('男','女')
+);
+insert into studen values
+(1,'张三','男'),
+(2,'李四','女'),
+(3,'王五','男');
+```
+
+## 查询
+
+```java
+public class Sele {
+    public static void main(String[] args) {
+        ResultSet re = null;
+        Statement sta = null;
+        Connection con = null;
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
+            String usename = "root";//数据库用户名
+            String password = "root";//数据库密码
+            con = DriverManager.getConnection(url, usename, password);
+            String sql = "select * from studen";
+            sta = con.createStatement();
+            re = sta.executeQuery(sql);
+            while (re.next()) {
+                System.out.println(re.getInt("id") + ":" + re.getString("name") +" "+ re.getString("sex"));
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入错误！");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误!");
+        } finally {
+            try {
+                if (con != null) {
+                    con.close();
+                }
+                if (sta != null) {
+                    sta.close();
+                }
+                if (re != null) {
+                    re.close();
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+    }
+}
+
+```
+
+
+
+## 添加
+
+```java
+public class Inse {
+    public static void main(String[] args) {
+        Statement sta = null;
+        Connection con = null;
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
+            String usename = "root";//数据库用户名
+            String password = "root";//数据库密码
+            con = DriverManager.getConnection(url, usename, password);
+            String sql = "insert into studen values(4,'赵六','男')";
+            sta = con.createStatement();
+            int i = sta.executeUpdate(sql);
+            System.out.println("添加成功！");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入错误！");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误!");
+        } finally {
+            try {
+                if (con != null) {
+                    con.close();
+                }
+                if (sta != null) {
+                    sta.close();
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+}
+
+```
+
+
+
+## 修改
+
+```java
+public class Upda {
+    public static void main(String[] args) {
+        Statement sta = null;
+        Connection con = null;
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
+            String usename = "root";//数据库用户名
+            String password = "root";//数据库密码
+            con = DriverManager.getConnection(url, usename, password);
+            String sql = "update studen set name='老六' where id=4";
+            sta = con.createStatement();
+            int i = sta.executeUpdate(sql);
+            System.out.println("修改成功！");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入错误！");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误!");
+        } finally {
+            try {
+                if (con != null) {
+                    con.close();
+                }
+                if (sta != null) {
+                    sta.close();
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+}
+
+```
+
+## 删除
+
+```java
+public class Dele {
+    public static void main(String[] args) {
+        Statement sta = null;
+        Connection con = null;
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            String url = "jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8";//地址
+            String usename = "root";//数据库用户名
+            String password = "root";//数据库密码
+            con = DriverManager.getConnection(url, usename, password);
+            String sql = "delete from studen where id=4";
+            sta = con.createStatement();
+            int i = sta.executeUpdate(sql);
+            System.out.println("删除成功！");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包导入错误！");
+        } catch (SQLException e) {
+            System.out.println("SQL语句错误!");
+        } finally {
+            try {
+                if (con != null) {
+                    con.close();
+                }
+                if (sta != null) {
+                    sta.close();
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+}
+
+```
+