Common SQL commands and ASP programming

sql| programming in the database operation, nothing more than to add, delete, modify, this must be designed to some commonly used SQL statements, as follows:

How to use SQL Common commands:

(1) Data record filtering:

Sql= "SELECT * from data table where field name = field value order BY field name [desc]"

Sql= "SELECT * from data table where field name like% field value% order BY field name [desc]"

Sql= "SELECT top * from data table where field name order by field name [desc]"

Sql= "SELECT * from data table where field name in (value 1, value 2, value 3)"

Sql= "SELECT * from data table where field name between value 1 and value 2"

(2) Update data records:

sql= "Update data table set field name = field value where Condition expression"

Sql= Update data Table set field 1= value 1, field 2= value 2 ... field n= value n Where Condition expression "

(3) Delete data records:

Sql= "Delete from data table where condition expression"

Sql= "Delete from data table" (delete all records from datasheet)

(4) Adding data records:

sql= INSERT into Data table (field 1, Field 2, Field 3 ...) valuess (value 1, value 2, value 3 ...)

Sql= INSERT INTO Target datasheet SELECT * from source datasheet (add a record from the source datasheet to the destination datasheet)

(5) Data record statistic function:

AVG (field name) to derive a table column average
Count (*| field name) statistics on the number of data rows or the number of data rows that have a value for a column
Max (field name) gets the maximum value of a table column
Min (field name) gets the smallest value of a table column
sum (field name) adds the value of the data bar

How to reference the above function:

Sql= "Select sum (field name) as Alias from data table where condition expression"
Set Rs=conn.excute (SQL)

Using RS ("Alias") to obtain the value of the unified, other functions using the same.

(5) The establishment and deletion of the data table:

CREATE Table datasheet Name (field 1 type 1 (length), Field 2 type 2 (length) ...)

Example: CREATE TABLE tab01 (name varchar, datetime default Now ())

drop table datasheet name (permanently deletes a data table)

　　In ASP programming, the following statements must be known:

1. Connecting to the database

A. asp connects to an Access database:

<%@ Language=vbs cript%>
<%
Dim conn,mdbfile
Mdbfile=server.mappath ("database name. mdb")
Set Conn=server.createobject ("Adodb.connection")
Conn.Open "Driver={microsoft Access Driver (*.mdb)};uid=admin;pwd= database password; dbq=" &mdbfile
%>

B. asp connection to SQL database:

<%@ Language=vbs cript%>
<%
Dim conn
Set Conn=server.createobject ("Adodb.connection")
Con.open "Provider=sqloledb;data source=sql server name or IP address; Uid=sa; pwd= database password; database= database name
%>

To set up a Recordset object:

Set Rs=server.createobject ("Adodb.recordset")
Rs.Open SQL statement, conn,3,2

2. Method of Recordset object:

Rs.movenext moves the record pointer down one row from the current position
Rs.moveprevious move the record pointer up one row from the current position
Rs.movefirst move the record pointer to the first row of the datasheet
Rs.movelast move the record pointer to the last row of the datasheet
Rs.absoluteposition=n move the record pointer to the nth row of the datasheet
Rs.absolutepage=n move the record pointer to the first row of page N
Rs.pagesize=n set every page to N records
Rs.pagecount returns the total number of pages based on pagesize settings
Rs.recordcount returns the total number of records
RS.BOF returns whether the record pointer is over the first end of the datasheet, True indicates Yes, FALSE is no
Rs.eof returns whether the record pointer is over the end of the datasheet, True indicates Yes, FALSE is no
Rs.delete deletes the current record, but the record pointer does not move down
Rs.addnew add records to the end of the datasheet
Rs.update Update datasheet Record

Report:

Constants Constant Numerical description
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adLockReadOnly 1 defaults, the Recordset object starts as read-only and cannot run AddNew, Update, and Delete methods
Adlockprssimistic 2 When the data source is being updated, the system temporarily locks the actions of other users to maintain data consistency.
adLockOptimistic 3 When the data source is being updated, the system does not lock other users ' actions, other users can add, delete, and change the operation of the data.
adLockBatchOptimistic 4 When the data source is being updated, other users must change the CursorLocation property to Adudeclientbatch to add, delete, and modify the data.