From 2151406169c6934cb0f88e4222a7c7dc483ab995 Mon Sep 17 00:00:00 2001 From: Administrator <752478464@qq.com> Date: Tue, 28 May 2024 20:38:42 +0800 Subject: [PATCH 1/3] =?UTF-8?q?feat:=E8=B6=85=E7=9A=84?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../MysqlMain.java" | 33 +++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 "work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" diff --git "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" new file mode 100644 index 0000000..4342068 --- /dev/null +++ "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" @@ -0,0 +1,33 @@ +package com.java.minxi.java_20240524.java_2302_陈冠宇_2344310209; + +import com.mysql.cj.jdbc.Driver; + +import javax.xml.stream.events.StartDocument; +import java.net.ConnectException; +import java.sql.Connection; +import java.sql.DriverManager; +import java.sql.Statement; +import java.sql.*; + + +public class MysqlMain { + + + public static void main(String[] args) throws Exception{ + String url="jdbc:mysql://127.0.0.1:3306/company?serverTimezone=Asia/Shanghai"; + String username="root"; + String password="123456"; + Connection conn= DriverManager.getConnection(url,username,password); + String sql="select id,user_name,user_age,user_sex,user_phone from user_info;"; + Statement stmt = conn.createStatement(); + int count = stmt.executeUpdate(sql); + System.out.println(count); + stmt.close(); + conn.close(); + + } + + + + +} -- Gitee From f16f1a494e1abf709587d3e176f8afaec942ecc2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=99=88=E5=86=A0=E5=AE=87?= <752478464@qq.com> Date: Wed, 29 May 2024 17:36:03 +0800 Subject: [PATCH 2/3] =?UTF-8?q?fix:=E8=B6=85=E7=9A=84?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../MysqlMain.java" | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" index 4342068..d705a4d 100644 --- "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" +++ "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" @@ -1,5 +1,6 @@ package com.java.minxi.java_20240524.java_2302_陈冠宇_2344310209; +import com.java.minxi.java_20240512.java_2302_陈冠宇_2344310209.List; import com.mysql.cj.jdbc.Driver; import javax.xml.stream.events.StartDocument; @@ -18,13 +19,14 @@ public class MysqlMain { String username="root"; String password="123456"; Connection conn= DriverManager.getConnection(url,username,password); - String sql="select id,user_name,user_age,user_sex,user_phone from user_info;"; - Statement stmt = conn.createStatement(); - int count = stmt.executeUpdate(sql); - System.out.println(count); - stmt.close(); + String sql="select id,teacher_name,teacher_age from teacher_info;"; + PreparedStatement pre = conn.prepareStatement(sql); + ResultSet resultSet = pre.executeQuery(); + + pre.close(); conn.close(); + List<> } -- Gitee From f186c5e1975a59b9ea0040240dd9bce2430931d3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=99=88=E5=86=A0=E5=AE=87?= <752478464@qq.com> Date: Thu, 30 May 2024 10:45:00 +0800 Subject: [PATCH 3/3] =?UTF-8?q?fix:=E8=B6=85=E7=9A=84?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../MysqlMain.java" | 116 +++++++++++++++--- 1 file changed, 102 insertions(+), 14 deletions(-) diff --git "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" index d705a4d..6bfc2f7 100644 --- "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" +++ "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\345\206\240\345\256\207_2344310209/MysqlMain.java" @@ -1,10 +1,6 @@ package com.java.minxi.java_20240524.java_2302_陈冠宇_2344310209; -import com.java.minxi.java_20240512.java_2302_陈冠宇_2344310209.List; -import com.mysql.cj.jdbc.Driver; -import javax.xml.stream.events.StartDocument; -import java.net.ConnectException; import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; @@ -12,24 +8,116 @@ import java.sql.*; public class MysqlMain { + public static void main(String[] args) throws Exception { + Text1(); + Text2(); + Text3(); + } + + + + public static void Text1() throws Exception{ + Class.forName("com.mysql.cj.jdbc.Driver"); + + String url = "jdbc:mysql:///student?serverTimezone=Asia/Shanghai"; + + String username = "root"; + + String password = "123456"; + + Connection conn = DriverManager.getConnection(url, username, password); + + String sql = "select * from teacher_info;"; + + Statement stmt = conn.createStatement(); + + ResultSet resultSet = stmt.executeQuery(sql); + + System.out.println("所有用户信息:"); - public static void main(String[] args) throws Exception{ - String url="jdbc:mysql://127.0.0.1:3306/company?serverTimezone=Asia/Shanghai"; - String username="root"; - String password="123456"; - Connection conn= DriverManager.getConnection(url,username,password); - String sql="select id,teacher_name,teacher_age from teacher_info;"; - PreparedStatement pre = conn.prepareStatement(sql); - ResultSet resultSet = pre.executeQuery(); + System.out.println("id\t\tteacher_name\tteacher_age"); + + while (resultSet.next()){ + int id = resultSet.getInt("id"); + String name = resultSet.getString("teacher_name"); + + int age = resultSet.getInt("teacher_age"); + System.out.println(id+"\t\t"+name+"\t\t\t"+age); + } + System.out.println(); + + resultSet.close(); + + stmt.close(); - pre.close(); conn.close(); - List<> } + private static void Text2() throws Exception{ + + String url = "jdbc:mysql:///student?serverTimezone=Asia/Shanghai"; + + String username = "root"; + + String password = "123456"; + + Connection conn = DriverManager.getConnection(url, username, password); + + String sql = "select * from teacher_info where id = 1 && teacher_age = 35;"; + + Statement stmt = conn.createStatement(); + + ResultSet resultSet = stmt.executeQuery(sql); + System.out.println("id为1，且年龄为35岁的用户:"); + + System.out.println("id\t\tteacher_name\tteacher_age"); + + while (resultSet.next()){ + + int id = resultSet.getInt(1); + + String name = resultSet.getString(2); + + int age = resultSet.getInt(3); + + System.out.println(id+"\t\t"+name+"\t\t\t"+age); + + } + System.out.println(); + + resultSet.close(); + + stmt.close(); + + conn.close(); + } + + private static void Text3() throws Exception { + + String url = "jdbc:mysql:///student?serverTimezone=Asia/Shanghai"; + + + String username = "root"; + + String password = "123456"; + + Connection conn = DriverManager.getConnection(url, username, password); + + String sql = "update teacher_info set teacher_name = '小严' where id = 3;"; + Statement stmt = conn.createStatement(); + + int i = stmt.executeUpdate(sql); + if (i > 0) { + System.out.println("执行成功"); + } else { + System.out.println("执行失败"); + } + stmt.close(); + conn.close(); + } } -- Gitee