Use shell to extract and update db2 data

The db2 tutorial is: use shell to extract and update db2 data. The shell that is written for work needs to process the db2 database program. Use shell to extract and process db2 data.
# SQL Definition

SQL = "SELECT AAA, BBB, CCC FROM MYTBL1"

# Execute SQL

SDATA = 'db2 "$ SQL "'

# Return Value Judgment

If [$? -Ne 0]

Then

# Display error messages returned by db2

Echo "$ SDATA"

Exit 1

Fi

# Process the obtained data.

Echo "$ SDATA" | sed-e'4,/^ $ /! D;/^ $/d' |

While read AAA BBB CCC

Do

Echo "aaa is $ AAA, bbb is $ BBB, ccc is $ CCC"

Done

# Retrieve data pieces

Echo "$ SDATA" | sed-n-e '/^ $/{1, 3d; n; s/[^ 0-9] * \ ([0-9] * \) [^ 0-9] */\ 1/; p;} '| read CNT

Echo "The count of selected data is $ CNT ."

Exit 0★Update db2 data and obtain the update result.

SQL = "UPDATE MYTBL1 SET AAA = '000000', BBB = '05 ', CCC = '12 '"

# Execute SQL

SDATA = 'db2-a "$ SQL "'

# Obtain SQLCODE

Echo "$ SDATA" | sed-n-e's/^. * sqlcode: \ ([-, 0-9] [0-9] * \). */\ 1/P' | read SQLCODE

Echo "Sqlcode is $ SQLCODE ."

# Obtain SQLSTATE

Echo "$ SDATA" | sed-n-e's/^. * sqlstate: \ ([-, 0-9] [0-9] * \). */\ 1/P' | read SQLSTATE

Echo "Sqlstate is $ SQLSTATE ."

# Obtain the number of updates (the third value of sqlerrd)

Echo "$ SDATA" | sed-n-e '/sqlerrd/s/^. * (3) \ ([-, 0-9] [0-9] * \). */\ 1/P' | read UPDCNT

Echo "Updated data's count is $ UPDCNT ."

# Obtain the fifth value of sqlerrd

Echo "$ SDATA" | sed-n-e '/sqlerrd/{n; s/^. * (5) \ ([-, 0-9] [0-9] * \). */\ 1/; p;} '| read SQLERRD5

Echo "Sqlerrd (5) is $ SQLERRD5 ."