snowflake sql

image in a black rectangle first // The following generates a snowflake background. In fact, some symbols are generated on the image.For ($ I = 1; $ I Imagestring ($ aimg, 1, mt_rand (1, $ img_width), mt_rand (1, $ img_height), "*", imageColorAllocate ($ aimg, mt_rand (200,255 ), mt_rand (200,255), mt_rand (200,255 )));// Actually, it is not a snowflake, that is, generating the * number. To make them look

); // srand is not required after PHP420For ($ Tmpa = 0; $ Tmpa $ Nmsg. = dechex (rand (0, 15 ));} // By sports98$ HTTP_SESSION_VARS [login_check_number] = $ nmsg; // $ HTTP_SESSION_VARS [login_check_number] = strval (mt_rand ("1111", "9999"); // generates a four-digit random number and puts it into the session// Who can make the supplement and generate letters and numbers at the same time ?? ---- Completed by sports98 $ Aimg = imageCreate ($ img_height, $ img_width); // generate an imageImageCo

This algorithm is used to generate Koch fragment (coastline, snowflake) with fast speed and brilliant effects. // The horizontal angle of the supported initial straight line is a multiple of 60. You can change the starting point and ending point coordinates to generate void Koch (CDC * PDC, int X1, int Y1, int X2, int Y2, int N) {If (n> 0) {Double K = 1.0 * (Y2-Y1)/(x2-X1); int X3 = (x2-X1) /3; int Y3 = (Y2-Y1)/3; Koch (PDC, X1, Y1, X1 + X3, Y1 + Y3,

After hashing, compare 6 times for each snowflake.1#include 2#include 3#include 4#include 5#include 6 7 using namespacestd;8 9 Const intMAXN =15010;Ten Const intPrime =14997; One A structFlake - { - intarm[6]; the BOOL operator== (Const structFlake b)Const - { - for(intI=0;i6; i++) - { + intJ; - for(j=0;j6; j + +) + { A if(arm[(j+i)%6]! = B.arm[j]) Break; at

, $ black); // enclose an image in a black rectangle first// The following generates a snowflake background. In fact, some symbols are generated on the image.For ($ I = 1; $ I ImageString ($ aimg, 1, mt_rand (1, $ img_height), mt_rand (1, $ img_width), "*", imageColorAllocate ($ aimg, mt_rand (200,255 ), mt_rand (200,255), mt_rand (200,255 )));// Ha, you can see it. it's not actually a snowflake, it's just

sessionWho can make the next addition, you can generate letters and numbers at the same time?? ----finished by Sports98.$aimg = Imagecreate ($img _height, $img _width); Create a pictureImagecolorallocate ($aimg, 255,255,255); Image background, imagecolorallocate the 1th time definition of color PHP is considered an undertone.$black = Imagecolorallocate ($aimg, 0,0,0); Define the required BlackImagerectangle ($aimg, 0,0, $img _height-1, $img _width-1, $black);//First a black rectangle surrounds

In the distributed system, the need to generate global uid or more, the snowflake of Twitter to solve this demand, implementation is still very simple, remove configuration information, the core code is the millisecond time 41-bit + machine ID 10-bit + millisecond sequence 12 bits. There are many PHP plug-ins on the Web module, the core of the network communication will generate the ID sent to PHP use, not in-depth study of PHP module writing. No more

] = Strval (Mt_rand ("1111", "9999")); Generate 4-bit random numbers and put them in sessionWho can make the next addition, you can generate letters and numbers at the same time?? ----finished by Sports98.$aimg = Imagecreate ($img _height, $img _width); Create a pictureImagecolorallocate ($aimg, 255,255,255); Image background, imagecolorallocate the 1th time definition of color PHP is considered an undertone.$black = Imagecolorallocate ($aimg, 0,0,0); Define the required BlackImagerectangle ($ai

When the display is turned off, the build speed of 30,000 per millisecond can be reached/*** An implementation of Twitter snowflake ID Generator*/ Public classSnowflakeid {Private Final Static LongEPOCH = 0L;//shift for smaller timestamp Private Final Static LongDevice_id_bits = 2L; Private Final Static LongSequence_bits = 16L; Private Final Static Longmax_worker_id = -1l ^ -1l //with non-or | xor ^, only the bit on Worker_id_bits is 1 Private

] = $ nmsg;// $ HTTP_SESSION_VARS [login_check_number] = strval (mt_rand ("1111", "9999"); // generates a four-digit random number and puts it into the session// Who can make the supplement and generate letters and numbers at the same time ?? ---- Completed by sports98$ Aimg = imageCreate ($ img_height, $ img_width); // generate an imageImageColorAllocate ($ aimg, 255,255,255); // image background color, ImageColorAllocate 1st definition color PHP considers it as background color$ Black = ImageC

The SnowFlake algorithm and phpsnowflake Algorithm for generating unique IDs in PHP Recently, a CMS system needs to be developed. Due to its single function and flexible requirements, the mature system like WP is abandoned and its own one is relatively simple. The URL of the article is designed to be a URL pseudo-static format: xxx.html. xxx has considered using an auto-incrementing primary key directly. However, it seems that the number of articles i

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su

The recent project used the snowflake algorithm to generate ID, and in the actual running environment will generate duplicate ID, so wrote a go program to verify, by the way also practice the go to the process and channel.As for the process of go and the basic knowledge of the channel, please own Baidu.The code is as follows:Package Mainimport ("FMT" "Github.com/zheng-ji/gosnowflake") func main () {FMT. Println ("Hell Go!") IW, err: = Gosnowflake.newi

The MyBatis plus configuration primary key generation strategy is 2, which is to generate IDs using the Twitter snowflake algorithmThe spring boot is configured as:Globalconfiguration conf = new Globalconfiguration (new Logicsqlinjector ());Conf.setidtype (5);This generates a long type, and if you want to convert the ID to a string type, configure the primary key generation strategy to 5.https://gitee.com/baomidou/mybatis-plus/blob/dev/mybatis-plus-su