bcc library database

ASP get database table name, field name Take SQL Server as an example: SET conn=server.createobject ("ADODB. Connection ")Conn.Open "SERVER=IP address; provider=sqloledb;database= library name; uid= user name; pwd= password; "%> Read the table name in the SQL Server library: Set Rs=conn.openschema While not Rs.

-ins, and then use the plug-in to access the database, directly realize the separation.The advantages are: less code, simple implementation, and good extensibility.Disadvantages are: Difficult to control, the separation method is limited, there are problems difficult to solve. No particularly mature plugins found.3, middleware implementation. Using some of the database access middleware, before accessing th

Program | pagination | keywords | data | database | display. Ayu often write some database-related programs, of course, can not be separated from the display of data in the library, to tell the truth, do such a program is really boring ah, so, Ayu want to write a function, a common database display function. Requireme

When the number of single-table records reaches millions to tens, the use of a table is necessary.Data segmentation can be physical, the data through a series of segmentation rules to distribute the data to different DB servers, routing rules to access a specific database, so that each access to face is not a single server, but the n server, which can reduce the load pressure on a single machine.Data segmentation can also be within the

Code farmers will encounter the tedious operation of writing library, the data Access layer of the SQL statement package is good to implement, but once the field, such as more than 10 more than 20 fields, the SQL package will be a huge problem, not to say how difficult, but this operation is very cumbersome, and very prone to error, SQL statements can be difficult to troubleshoot once they are faulted. I also encountered the same problem in developmen

replacement3. Ensure that the database is not updated, export all dataMysqldump-uroot-p--quick--no-create-info--extended-insert--default-character-set=latin1 dbname >alldata.sql650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M01/8B/0F/wKioL1hDvOXQXg4pAAKbP5wYnIA523.png "title=" Picture 1.png "alt=" Wkiol1hdvoxqxg4paakbp5wynia523.png "/>4. Open alldata.sql to modify the set names latin1 to set names GBK; or modify the server and client of t

Tags: User process egrep Tab Plain Sub-Library backup mysqld repr mysqSub-Library Backup#!/bin/sh DBPATH=/server/backup MYUSER=root MYPASS=oldboy123 SOCKET=/data/3306/mysql.sock MYCMD="mysql-u$MYUSER-p$MYPASS-S$SOCKET" MYDUMP="mysqldump-u$MYUSER-p$MYPASS-S$SOCKET" [!-d$DBPATH]mkdir$DBPATH fordbnamein`$MYCMD-e"showdatabases;"|sed‘1,2d‘|egrep -v"mysql|schema"` do $MYDUMP$dbname|gzip>$DBPATH/${dbname}_$(date+%

找到相应数据所在的位置是我们需要关心的。?常用的路由策略有：?1.?按号分段：? ?user_id为区分，1-1000对应DB1，1001-2000对应DB2依次类推? ?优点：可部分迁移? ?缺点：数据分布不均?2.hash取模? ?对user_id等字段进行hash值计算后取模。比如应用中分为4个库的话，对hash(user_id)%4为1的对应DB1,为2的对应DB2,为3的对应DB3,为0? ?的对应DB4? ?优点：数据分布均匀? ?缺点：迁移麻烦，不能按照机器性能分摊数据Common design options:?1.提供分库规则和路由规则?2.引入集群，保证数据的可用性?3.引入负载均衡?4.引入集群节点探测?5.引入读写分离Provision of library rules and routing rules introduction of clusters to ensure data availability introduct

Tags: blog http ar os using SP Java Data divWhen the team of the system business and the database has been carefully combed, determined the segmentation scheme, the next problem is how to achieve the segmentation scheme, at present, there are many open source framework and products for reference in Sharding, at the same time many teams will choose to self-development implementation, regardless of the choice of framework or self-development, Will face

The design of database extensibility Architecture Http://mp.weixin.qq.com/s/gI6j_TyjJ4jEb-i8HstFawProblems and solutions to be considered in the sub-list of http://www.jianshu.com/p/32b3e91aa22cInfinite Capacity Database architecture design HTTPS://MP.WEIXIN.QQ.COM/S/AD4TPM6CDI9R6VGFBATZXGMQ Message Accessibility + idempotent + time-lapse architecture design Http://mp.weixin.qq.com/s/8oX7u8XcLL80_nNdN-UkvQH

Tags: schema change high concurrency balanced data migration split infinite load balancing delayThe design of database extensibility Architecture Http://mp.weixin.qq.com/s/gI6j_TyjJ4jEb-i8HstFawProblems and solutions to be considered in the sub-list of http://www.jianshu.com/p/32b3e91aa22cInfinite Capacity Database architecture design HTTPS://MP.WEIXIN.QQ.COM/S/AD4TPM6CDI9R6VGFBATZXGMQ Message Accessibility

' Installing the react native and Redux bindings Library: NPM Install–save React-redux Installing Redux thunk Asynchronous Action middleware: NPM install–save redux-thunk Three Principles Single Data source The state of the entire application is stored in an object tree, and the object tree exists in the unique store. The state in the store is bound to a component State is read-only The only way to change state is to trigger an action. The

Tags: size Create drop string Lin Color runner json loadAtitit dbservicev4qb9 database query class library v4 new features V4 new Features security features, shielding the executeupdate , using version v2 SQL Exception conversions, especially the Duplicateentryex Exception Split meta Svs,sql ast SVS ... public int executeupdatev2qb0 (String sql) throws Getconnex, Duplicateentryex, SQLException {

Label:After the sharding transformation of the system, the original single database will become multiple databases, how to ensure the simultaneous operation of multi-data source atomicity and consistency is a problem that has to be considered. Overall, there are currently three ways to transact transactions for a distributed system: Distributed transactions, transaction based on best efforts 1PC, and transaction compensation mechanisms. We analyze eac

written is too large to directlyMaximum burst disk.Resources have the maximum limit, the CPU is used for example 64-core model, the disk up to hundreds of T, then high sorry, no more cock machine, but there is no limit to the user's data and queries.The upper limit of connection pool resources, why to put the connection pool alone, the reason is that the business volume of a large,Disaster tolerance, although the transaction can ensure that the data is not lost after the restart, but the line o