execute()

Read(534) Label: database, execute sql,

Here’s how to use execute() function.

db .execute()

Description:

Execute a SQL statement through a specified database connection.

Syntax:

db.execute(sql {,args …} )

Execute the SQL statement sql in database db. args,… is the parameter of sql, which can also be a sequence consisting of parameter values

db.execute(A/cs, sql {, args,…} )

Execute the SQL statement sql in database db over sequence A/cs. args,… is the parameter of sql. The method can reduce the frequency of database access. Here args shouldn’t be a a sequence type parameter.

Note:

The function executes a SQL statement sql through the specified database connection. It is generally used to execute the SQL statements that change the records in a database (such as update and insert).

Parameters:

db

Data source connection

sql

A SQL statement in the form of select * from table, for example.

args

An argument value passed into the specified SQL command sql. It can be a constant or an expression. The comma is used to separate multiple arguments.

A

A sequence. the SQL statement is executed on each member of A. Generally args is computed against each member of A and the value is passed to the SQL statement for execution.

cs

A cursor

Options:

@k

After the execution is completed, the transaction won't be committed. by default the transaction will be committed.

@s

No preparation will be done for transaction processing.

Example:

 

A

 

1

=demo.execute("insert into DEPARTMENT (DEPT, MANAGER)values(?,?)","TecSupport",5)

Insert a record into the table

2

=demo.execute("delete from DEPARTMENT where DEPT='TecSupport'")

Delete the records whose DEPT values are ''TecSupport''

3

=demo.execute("update DEPARTMENT set MANAGER = ? where DEPT='Sales'","7")

Modify the MANAGER value of the record whose DEPT value is 'Sales' into 7

4

=[["'TecSupport ",5],[" AppSupport",9]].new(~(1):Dept,~(2): Manager)

5

=demo.execute(A4,"insert into DEPARTMENT (DEPT, MANAGER) values (?,?)", #1,#2)

#1 and #2 stand for the first and second columns respectively in A4

6

=demo.query("select * from DEPARTMENT")

7

=file("D://data_dept.txt").cursor@t()

Below is data_dept.txt:

8

=demo.execute(A7,"insert into DEPARTMENT (DEPT, MANAGER)values (?,?)", #1,#2)

A7 is a cursor

9

=demo.execute("insert into DEPARTMENT(DEPT, MANAGER) values(?)",["TecSupport",9])

a args is a sequence of parameter values. It is automatically converted into  =demo.execute("insert into DEPARTMENT(DEPT, MANAGER) values(?,?)","TecSupport",9) before execution. Same result as A1’s.

Related functions:

db.query()

db.proc()