JavaÁ¬½ÓmysqlÊý¾Ý¿â
Ê×ÏÈ£¬´ò¿ªMySQL Query Browser£¬ÔÚµ±Ç°TestÊý¾Ý¿âÏ£¬Ð½¨Ò»¸östudent±í£¬ÓÐÈçÏÂÊôÐÔ£º
create table student (name varchar(10),id int(2),sex varchar(10));
³ÌÐò¼ûÏ£º
package com.JDBC;
import java.sql.*;
public class JDBCTest {
public static void main(String[] args) {String driver = "com.mysql.jdbc.Driver"; // Çý¶¯³ÌÐòÃû
String url = "jdbc:mysql://localhost/test"; // URLÖ¸ÏòÒª·ÃÎʵÄÊý¾Ý¿âÃûscutcs
String user = "root"; // MySQLÅäÖÃʱµÄÓû§Ãû
String password = "123456"; // MySQLÅäÖÃʱµÄÃÜÂë
try {
Class.forName(driver); // ¼ÓÔØÇý¶¯³ÌÐò
Connection conn = DriverManager.getConnection(url, user, password); // Á¬ÐøÊý¾Ý¿â
if (!conn.isClosed())
System.out.println("Succeeded connecting to the Database!"); // ÑéÖ¤ÊÇ·ñÁ¬½Ó³É¹¦
Statement statement = conn.createStatement(); // statementÓÃÀ´Ö´ÐÐSQLÓï¾ä
String sql = "select * from student"; // ÒªÖ´ÐеÄSQLÓï¾ä
ResultSet rs = statement.executeQuery(sql); // ½á¹û¼¯
System.out.println("-----------------------------------------");
System.out.println("Ö´Ðнá¹ûÈçÏÂËùʾ:");
System.out.println("-----------------------------------------");
System.out.println(" ѧºÅ" + "\t\t" + " ÐÕÃû" + "\t\t" + "ÐÔ±ð");
System.out.println("-----------------------------------------");
String name = null;
while (rs.next()) {
name = rs.getString("name"); // Ñ¡ÔñnoÕâÁÐÊý¾Ý
System.out.println(rs.getString("id") + "\t\t" + name + "\t\t"
+ rs.getString("sex")); // Êä³ö½á¹û
}
rs.close();
conn.close();
} catch (ClassNotFoundException e) {
System.out.println("Sorry,can`t find the Driver!");
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Ïà¹ØÎĵµ£º
Ò».Óï·¨
explain < table_name >
ÀýÈç: explain select * from t3 where id=3952602;
¶þ.explainÊä³ö½âÊÍ
+----+-------------+-------+-------+-------------------+---------+---------+-------+------+-------+
| id | select_type | table | type | possible_keys | key ......
mysql ´ó¶ÔÏó´æÈ¡:
¡¡¡¡ÀàÐÍÒ»°ãÓ¦¸ÃÓÃmediumblod,
¡¡¡¡blobÖ»ÄÜ´æ2µÄ16´Î·½¸öbyte,
¡¡¡¡mediumblodÊÇ24´Î·½,
¡¡¡¡Ò»°ãÀ´Ëµ¹»ÓÃÁË.longblobÊÇ32´Î·½ÓÐЩ´ó.
¡¡¡¡MYSQLĬÈÏÅäÖÃÖ»ÄÜ´æ1M´óСµÄÎļþ,ÒªÐÞ¸ÄÅäÖÃ,WIN°æ±¾µÄÔÚmysql.iniÎļþÖÐ
¡¡¡¡ÐÞ¸Ämax_allowed_packet,net_buffer_lengthµÈ¼¸¸ö²ÎÊý,»òÖ±½ÓSET GLOBAL va ......
¹ØÓÚÐÞ¸ÄmysqlµÄrootÃÜÂëµÄ½â´ð£¨×Ü½áÆª£©
ÕûÀíÁËÒÔÏÂËÄÖÖÔÚMySQLÖÐÐÞ¸ÄrootÃÜÂëµÄ·½·¨,Ö÷ÒªÊÇÓÐʱºò×Ô¼ºÓöµ½ÁËÕâ¸öÎÊÌâ²»ÖªµÀÔõô¸ãÁË£¬µ±È»Èç¹ûÄܸø¹ã´óµÄPHPer½â¾öÎÊÌâÒ²ÊÇÎÒµÄÈÙÐÒ°¡£¬ºÇºÇ¡£
·½·¨1£º ÓÃSET PASSWORDÃüÁî
¡¡¡¡mysql -u root
¡¡¡¡mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('n ......
MySQL³£ÓòÙ×÷»ù±¾²Ù×÷£¬ÒÔ϶¼ÊÇMySQL5.0ϲâÊÔͨ¹ýÊ×ÏÈ˵Ã÷Ï£¬¼ÇסÔÚÿ¸öÃüÁî½áÊøÊ±¼ÓÉÏ£»£¨·ÖºÅ£©
1.µ¼³öÕû¸öÊý¾Ý¿â
mysqldump -u Óû§Ãû -p --default-character-set=latin1 Êý¾Ý¿âÃû > µ¼³öµÄÎļþÃû(Êý¾Ý¿âĬÈϱàÂëÊÇlatin1)
mysqldump -u wcnc -p smgp_apps_wcnc > wcnc.sql
2.µ¼³öÒ»¸ö±í
mysqldump -u Ó ......
JDBCÁ¬½ÓMySQL
JDBCÁ¬½ÓMySQL
¼ÓÔØ¼°×¢²áJDBCÇý¶¯³ÌÐò
Class.forName("com.mysql.jdbc.Driver");
Class.forName("com.mysql.jdbc.Driver").newInstance();
JDBC URL ¶¨ÒåÇý¶¯³ÌÐòÓëÊý¾ÝÔ´Ö®¼äµÄÁ¬½Ó
±ê×¼Óï·¨£º
<protocol£¨Ö÷ҪͨѶÐÒ飩>:<subprotocol£¨´ÎҪͨѶÐÒ飬¼´Çý¶¯³ÌÐòÃû³Æ£©>:<data so ......