标签：har 查看 mit exists des upd init 管理器 manager
sc
service console,服务控制台程序，可以启动，停止，删除等服务
sc start MySQL
sc stop MySQL
sc delete MySQL //删除，从注册表删除服务记录
MySQL常用指令
mysql -h hostname -u root -p password //连接远程数据库
mysql -u root -p password //连接localhost
mysql --help //查看帮助
mysql>select current_date; //
mysql>select now(); //函数
mysql>-- 这是注释
mysql>show databases; //显示所有数据库
mysql>drop database mydatabase; //删除某个数据库
mysql>create database mydatabase; //创建数据库
mysql>use mydatabase; //指定使用数据库
mysql>show tables; //显示表
mysql>create table tablename testtable(id varchar(20), psw varchar(20));//创建表
mysql>describe testtable; 或 desc testtable; //查看表结构
mysql>drop table testtable; //删除表
mysql>select * from testtable; //全字段，全表扫描
mysql>select * from testtable where id > 3;
mysql>select * from testtable where id >3 and id <5;
mysql> select * from testtable where id = ‘1‘;
mysql> select * from testtable where psw like ‘1%‘; //以1开头的，模糊查询
mysql> select * from testtable where psw not like ‘1%‘; //不是以1开头的
mysql> select * from testtable where psw like ‘1_‘; //以1开头的接着是任意一个字符
mysql> select * from testtable where psw like ‘1\_‘; //以1开头的接着是任意一个_(转义字符查询特殊字面量)
mysql> select * from testtable order by id desc; //j降序查询
mysql> select * from testtable order by id asc;
mysql> select * from testtable order by age asc, id desc; //组合排序
mysql>select id, psw from testtable; //投影查询
mysql>select * from testtable where psw is null; //查询psw为null
mysql>select * from testtable where psw is not null; //查询psw非null
mysql>select count(*) from testtable where psw = "123456";//聚集函数查询
mysql>select max(age) from testtable;
mysql>select min(age) from testtable;
mysql>select avg(age) from testtable;
mysql>select sum(age) from testtable where id < 5;
mysql>select * from testtable limit 1, 3;
mysql>select * from testtable limit 0, 3; =====select * from testtable limit 0. 3;//分页查询
mysql>insert into testtable(id, psw) values(‘1‘, ‘pass‘);//插入
mysql>insert into testtable(id) values(‘1‘);//插入部分字段
mysql>insert into testtable values(‘1‘, ‘pass‘);//插入全部字段
mysql>update testtable set psw = ‘123456‘ where id = ‘1‘;//修改
mysql>update testtable set age = 20 where id in (5, 6); //in
CRUD
[create]
insert into table_name(field_name,...) values(value,...);
[retrieve]
selete id,... from table_name where id = xxx,...;
[update]
update table_name set id = xxx, ... where id = xxx, ...;
[delete]
delete from table_name where ...;
source d:/findtest.sql //执行脚本文件
MySQL约束
1.primary key （非空，不能重复）
create tabe testtable(id int primary key, ...);
2.自增
create tabe testtable(id int primary key auto_increment, ...);
3.带条件创建
create database if not exists testbase;
create table if not exists test;
drop database if exists;
JDBC
java database connection, socket
//JDBCDemo.java
1 import java.sql.Connection; 2 import java.sql.DriverManager; 3 import java.sql.Statement; 4 5 public class JDBCDemo { 6 7 public static void main(String[] args) { 8 // 注册驱动程序 9 String url = "jdbc:mysql://localhost:3306/mytestbase"; 10 String user = "root"; 11 String password = "root"; 12 // 驱动器管理器 13 try { 14 Class.forName("com.mysql.jdbc.Driver"); 15 Connection connec = DriverManager.getConnection(url, user, password); 16 // 创建语句对象 17 Statement statement = connec.createStatement(); 18 String sql = "insert into testtable values(‘6‘, ‘opii‘)"; 19 statement.execute(sql); 20 System.out.println("over"); 21 // 释放资源 22 statement.close(); 23 connec.close(); 24 } catch (Exception e) { 25 e.printStackTrace(); 26 } 27 } 28 29 }
//TestCRUD.java
1 import java.sql.Connection; 2 import java.sql.DriverManager; 3 import java.sql.Statement; 4 5 import org.junit.Before; 6 import org.junit.Test; 7 8 import com.mysql.jdbc.ResultSet; 9 10 /** 11 * 测试增删查改 12 * 13 */ 14 public class TestCRUD { 15 16 private Connection connec; 17 18 /** 19 * 先执行 20 */ 21 @Before 22 public void initConn() { 23 String url = "jdbc:mysql://localhost:3306/mytestbase"; 24 String user = "root"; 25 String password = "root"; 26 // 驱动器管理器 27 try { 28 // 注册驱动程序 29 Class.forName("com.mysql.jdbc.Driver"); 30 connec = DriverManager.getConnection(url, user, password); 31 } catch (Exception e) { 32 e.printStackTrace(); 33 } 34 } 35 /** 36 * insert 37 */ 38 @Test 39 public void insert() { 40 try { 41 // 创建语句对象 42 Statement statement = connec.createStatement(); 43 String sql = "insert into testtable values(‘7‘, ‘opiill‘)"; 44 statement.execute(sql); 45 System.out.println("over"); 46 // 释放资源 47 statement.close(); 48 connec.close(); 49 } catch (Exception e) { 50 e.printStackTrace(); 51 } 52 } 53 54 /** 55 * update 56 */ 57 @Test 58 public void update() { 59 try { 60 // 创建语句对象 61 Statement statement = connec.createStatement(); 62 String sql = "update testtable set psw=‘newpass‘ where id = ‘7‘"; 63 statement.execute(sql); 64 System.out.println("over"); 65 // 释放资源 66 statement.close(); 67 connec.close(); 68 } catch (Exception e) { 69 e.printStackTrace(); 70 } 71 } 72 73 /** 74 * delete 75 */ 76 @Test 77 public void delete() { 78 try { 79 // 创建语句对象 80 Statement statement = connec.createStatement(); 81 String sql = "delete from testtable where id = ‘7‘"; 82 statement.execute(sql); 83 System.out.println("over"); 84 // 释放资源 85 statement.close(); 86 connec.close(); 87 } catch (Exception e) { 88 e.printStackTrace(); 89 } 90 } 91 92 /** 93 * query 94 */ 95 @Test 96 public void query() { 97 try { 98 // 创建语句对象 99 Statement statement = connec.createStatement(); 100 String sql = "select * from testtable"; 101 ResultSet rs = (ResultSet) statement.executeQuery(sql); 102 while (rs.next()) { 103 String id = rs.getString("id"); 104 String psw = rs.getString("psw"); 105 System.out.println(id + ":" + psw); 106 } 107 System.out.println("over"); 108 // 释放资源 109 rs.close(); 110 statement.close(); 111 connec.close(); 112 } catch (Exception e) { 113 e.printStackTrace(); 114 } 115 } 116 }
标签：har 查看 mit exists des upd init 管理器 manager
原文地址：http://www.cnblogs.com/8386blogs/p/7606207.html
