From e51a387b997435eae6e6e28d877578371306f443 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A7=9C=E4=BC=9F=E5=B1=B1?= <2609838563@qq.com>
Date: Fri, 19 May 2023 18:53:16 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BD=9C=E4=B8=9A?=
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Content-Type: text/plain; charset=UTF-8
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---
 .../20230519 jsp\345\237\272\347\241\200.md"  | 164 ++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 "39 \345\247\234\344\274\237\345\261\261/20230519 jsp\345\237\272\347\241\200.md"

diff --git "a/39 \345\247\234\344\274\237\345\261\261/20230519 jsp\345\237\272\347\241\200.md" "b/39 \345\247\234\344\274\237\345\261\261/20230519 jsp\345\237\272\347\241\200.md"
new file mode 100644
index 0000000..e8f45c2
--- /dev/null
+++ "b/39 \345\247\234\344\274\237\345\261\261/20230519 jsp\345\237\272\347\241\200.md"	
@@ -0,0 +1,164 @@
+```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);
+        }
+    }
+}
+
+
+
+```
+
+```java
+### 修改
+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);
+        }
+
+    }
+}
+```
+
+```java
+### 增加
+
+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);
+        }
+    }
+}
+```
+
+```java
+### 删除
+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);
+        }
+
+    }
+}
+```
+
-- 
Gitee