MySQL 分页存储过程 (转)
无详细内容 无 /*--名称:MYSQL版查询分页存储过程 by peace 2013-8-14--输入参数:@fields -- 要查询的字段用逗号隔开--输入参数:@tables -- 要查询的表--输入参数:@where -- 查询条件--输入参数:@orderby -- 排序字段--输出参数:@page -- 当前页计数从1
/* --名称:MYSQL版查询分页存储过程 by peace 2013-8-14 --输入参数:@fields -- 要查询的字段用逗号隔开 --输入参数:@tables -- 要查询的表 --输入参数:@where -- 查询条件 --输入参数:@orderby -- 排序字段 --输出参数:@page -- 当前页计数从1开始 --输出参数:@pagesize -- 每页大小 --输出参数:@totalcount -- 总记录数 --输出参数:@pagecount -- 总页数 --输出参数:_sumfields -- 统计字段 */ DROP PROCEDURE IF EXISTS Proc_Page; CREATE PROCEDURE Proc_Page ( in _fields varchar(2000), in _tables text, in _where varchar(2000), in _orderby varchar(200), in _pageindex int, in _pagesize int, in _sumfields varchar(200), out _totalcount int , out _pagecount int ) begin set @startRow = _pageSize*(_pageIndex -1); set @pageSize = _pageSize; set @rowindex = 0; set @strsql = CONCAT('select sql_calc_found_rows @rowindex:=@rowindex+1 as rownumber,',_fields,' from ',_tables,case ifnull(_where,'') when '' then '' else concat(' where ',_where) end,' order by ',_orderby,' limit ',@startRow,',',@pageSize); prepare strsql from @strsql; execute strsql; deallocate prepare strsql; set _totalcount = found_rows(); if (_totalcount <= _pageSize) then set _pagecount = 1; else if (_totalcount % _pageSize > 0) then set _pagecount = _totalcount / _pageSize + 1; else set _pagecount = _totalcount / _pageSize; end if; end if; if(ifnull(_sumfields,'') <> '') then set @sumsql = contact('select ',_sumfields,' from ',_tables,case ifnull(_where,'') when '' then '' else concat(' where ',_where) end); prepare sumsql from @sumsql; execute sumsql; deallocate prepare sumsql; end if; end

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In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

MySQL is suitable for beginners because it is simple to install, powerful and easy to manage data. 1. Simple installation and configuration, suitable for a variety of operating systems. 2. Support basic operations such as creating databases and tables, inserting, querying, updating and deleting data. 3. Provide advanced functions such as JOIN operations and subqueries. 4. Performance can be improved through indexing, query optimization and table partitioning. 5. Support backup, recovery and security measures to ensure data security and consistency.

Navicat itself does not store the database password, and can only retrieve the encrypted password. Solution: 1. Check the password manager; 2. Check Navicat's "Remember Password" function; 3. Reset the database password; 4. Contact the database administrator.

1. Use the correct index to speed up data retrieval by reducing the amount of data scanned select*frommployeeswherelast_name='smith'; if you look up a column of a table multiple times, create an index for that column. If you or your app needs data from multiple columns according to the criteria, create a composite index 2. Avoid select * only those required columns, if you select all unwanted columns, this will only consume more server memory and cause the server to slow down at high load or frequency times For example, your table contains columns such as created_at and updated_at and timestamps, and then avoid selecting * because they do not require inefficient query se

Create a database using Navicat Premium: Connect to the database server and enter the connection parameters. Right-click on the server and select Create Database. Enter the name of the new database and the specified character set and collation. Connect to the new database and create the table in the Object Browser. Right-click on the table and select Insert Data to insert the data.

View the MySQL database with the following command: Connect to the server: mysql -u Username -p Password Run SHOW DATABASES; Command to get all existing databases Select database: USE database name; View table: SHOW TABLES; View table structure: DESCRIBE table name; View data: SELECT * FROM table name;

Navicat for MariaDB cannot view the database password directly because the password is stored in encrypted form. To ensure the database security, there are three ways to reset your password: reset your password through Navicat and set a complex password. View the configuration file (not recommended, high risk). Use system command line tools (not recommended, you need to be proficient in command line tools).

Copying a table in MySQL requires creating new tables, inserting data, setting foreign keys, copying indexes, triggers, stored procedures, and functions. The specific steps include: creating a new table with the same structure. Insert data from the original table into a new table. Set the same foreign key constraint (if the original table has one). Create the same index. Create the same trigger (if the original table has one). Create the same stored procedure or function (if the original table is used).
