From 249ac07bf419a50b9e6604d7b713f1b9bc6ad2b9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E5=BF=97=E4=BC=9F?= <2152890632@qq.com>
Date: Thu, 18 May 2023 00:09:24 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=B8=80=E6=AC=A1=E7=9A=84=E4=BD=9C?=
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---
 ...10\345\271\266\344\275\234\344\270\232.md" | 167 ++++++++++++++++++
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 create mode 100644 "06 \351\231\210\345\277\227\344\274\237/20230518 js\345\220\210\345\271\266\344\275\234\344\270\232.md"

diff --git "a/06 \351\231\210\345\277\227\344\274\237/20230518 js\345\220\210\345\271\266\344\275\234\344\270\232.md" "b/06 \351\231\210\345\277\227\344\274\237/20230518 js\345\220\210\345\271\266\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..8c804b1
--- /dev/null
+++ "b/06 \351\231\210\345\277\227\344\274\237/20230518 js\345\220\210\345\271\266\344\275\234\344\270\232.md"	
@@ -0,0 +1,167 @@
+# 查询
+
+```java
+import java.sql.*;
+
+public class Select {
+    public static void main(String[] args) {
+        //0.导包
+        //1.注册驱动
+        ResultSet rst = null;
+        Connection conn = null;
+        Statement smt = null;
+        try {
+            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";
+            conn = DriverManager.getConnection(url, username, password);
+            //3.编写sql语句
+            String sql = "select * from biao";
+            //4.获取执行sql的对象
+            smt = conn.createStatement();
+            //5.smt执行sql
+            rst = smt.executeQuery(sql);
+            //6.处理返回的结果
+            while (rst.next()) {
+                int id = rst.getInt("id");
+                String name = rst.getString("name");
+                double money = rst.getDouble("money");
+                System.out.println(id + ":" + name + "-" + money);
+            }
+            //7.释放资源
+
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包没有正确导入");
+        } catch (SQLException e) {
+            System.out.println("sql语句执行错误");
+        } finally {
+            try {
+                if (rst!=null){
+                    rst.close();
+                }
+                if (conn!=null){
+                    conn.close();
+                }
+                if (smt!=null) {
+                    smt.close();
+                }
+            } catch (SQLException e) {
+                System.out.println("资源释放异常");
+            }
+        }
+
+    }
+}
+
+```
+
+# 添加
+
+```java
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class Inset {
+    public static void main(String[] args) {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            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);
+            String sql="insert into biao values('黎明',6,1000)";
+            Statement sta = conn.createStatement();
+            int i = sta.executeUpdate(sql);
+            if (i>0){
+                System.out.println("添加成功");
+            }else {
+                System.out.println("添加失败");
+            }
+            conn.close();
+            sta.close();
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包没有正确导入");
+        } catch (SQLException e) {
+            System.out.println("sql语句执行错误");
+        }
+    }
+}
+
+```
+
+# 删除
+
+```java
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class Delect {
+    public static void main(String[] args) {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            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);
+            String sql="delete from biao where id = 6";
+            Statement sta = conn.createStatement();
+            int i = sta.executeUpdate(sql);
+            if (i>0){
+                System.out.println("删除成功"+i+"条");
+            }else {
+                System.out.println("删除失败");
+            }
+            conn.close();
+            sta.close();
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包没有正确导入");
+        } catch (SQLException e) {
+            System.out.println("sql语句执行错误");
+        }
+    }
+}
+
+```
+
+# 修改
+
+```java
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class Update {
+    public static void main(String[] args) {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            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);
+            String sql="update biao set name ='李明' where id = 6";
+            Statement sta = conn.createStatement();
+            int i = sta.executeUpdate(sql);
+            if (i>0){
+                System.out.println("修改成功"+i+"条");
+            }else {
+                System.out.println("修改失败");
+            }
+            conn.close();
+            sta.close();
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包没有正确导入");
+        } catch (SQLException e) {
+            System.out.println("sql语句执行错误");
+        }
+    }
+}
+
+```
+
-- 
Gitee