Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo

Close

[r8763]: incubator / ooSQLite / examples / classic.rexx / preparedStmtRtn.rex Maximize Restore History

Download this file

preparedStmtRtn.rex    166 lines (144 with data), 7.5 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
#!/usr/bin/rexx
/*----------------------------------------------------------------------------*/
/* */
/* Copyright (c) 2012-2012 Rexx Language Association. All rights reserved. */
/* */
/* This program and the accompanying materials are made available under */
/* the terms of the Common Public License v1.0 which accompanies this */
/* distribution. A copy is also available at the following address: */
/* http://www.oorexx.org/license.html */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the following */
/* conditions are met: */
/* */
/* Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in */
/* the documentation and/or other materials provided with the distribution. */
/* */
/* Neither the name of Rexx Language Association nor the names */
/* of its contributors may be used to endorse or promote products */
/* derived from this software without specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* */
/*----------------------------------------------------------------------------*/
/**
* preparedStmtTestRtn.rex
*
* This example program demonstrates the classic Rexx interface to ooSQLite.
*
* It opens the ooFoods database, creates a prepared statement that queries the
* database and steps through the result set printing the rows returned.
*
* This example also demonstrates more of the error checking that is missing in
* some of the simple example programs.
*/
dbName = 'ooFoods.rdbx'
-- dbConn will be set to the handle to the database connection. We do not
-- need to explicitly set the variable first. We could just name the variable
-- in the oosqlOpen() function and the result would be the same. But, for an
-- example program we do this to better show what is happening.
dbConn = ''
ret = oosqlOpen(dbName, 'dbConn', .ooSQLite~OPEN_READWRITE)
if ret <> .ooSQLite~OK then do
-- dbConn could be a null handle, if and only if the return code is NOMEM.
-- In this simple program, I would say that is impossible. But, you can not
-- pass in a null handle to any ooSQLite function. So, here we show how to
-- properly deal with this.
if ret == .ooSQLite~NOMEM then do
errRC = .ooSQLite~NOMEM
errMsg = 'memory allocation failed'
end
else do
errRC = oosqlErrCode(dbConn)
errMsg = oosqlErrMsg(dbConn)
end
say 'Open database error'
say ' Error code:' errRC '('errMsg')'
if errRC == .ooSQLite~CANTOPEN then do
say ' Database file name:' dbName '(Is this the correct database?)'
end
-- The statement that you can not pass in a null handle to any ooSQLite
-- function is not 100% accurate. Using null handles for oosqlClose() and
-- oosqlFinalize() are harmles nops. So, we don't check here. If dbConn is
-- a null handle, it doesn't need to be closed. In all other cases it does.
ret = oosqlClose(dbConn)
return 99
end
-- The third argument to oosqlPrepare(), below, is the name of the variable
-- that the handle to the prepared statement is set to. Similar to
-- oosqlOpen() explained above. Here we do not explicity set the stmt
-- variable, we just name it in the call to oosqlPrepare()
--
-- The fourth argument is the name of a variable whose value will be set to
-- the 'tail' of the SQL statement. SQLite only prepares the first statement
-- in the SQL, that is up to and including the first semi-colon ';'. SQLite
-- calls the unused portion of the SQL string the tail and will return the
-- tail if asked. The fourth argument is opitonal. If not omitted, the named
-- varible will have its value set to the unused portion of the SQL string.
-- This value will be the empty string if there is no tail. Again, this
-- argument is optional.
--
-- Note the nonsense at the end of the first SQL statement. This string will
-- be returned by setting the value of the variable unusedTail to the string
-- following the first semi-colon. Further note that the stmt variable is
-- always set, but the unusedTail variable is never set on error. If the
-- return code from oosqlPrepare() is an error code, stmt will always be a
-- null handle and unusedTail will never be set.
sqlStatement = 'SELECT * FROM foods ORDER BY name; INSERT nonsense INTO foodes'
ret = oosqlPrepare(dbConn, sqlStatement, 'stmt', 'unusedTail')
if ret <> .ooSQLite~OK then do
say 'Prepared statment initialization error:'
say ' Error code:' oosqlErrCode(dbConn) '('oosqlErrMsg(dbConn)')'
say ' Is stmt a null handle?' oosqlIsHandleNull(stmt)
ret = oosqlFinalize(stmt); say 'Error finalize ret:' ret
ret = oosqlClose(dbConn) ; say 'Error close ret:' ret
return 99
end
else do
say 'Unused portion of sql:'
str = unusedTail
say ' string: ' str
say ' length: ' length(str)
say
end
stepRC = oosqlStep(stmt)
if stepRC == .ooSQLite~ROW then do
colCount = oosqlColumnCount(stmt)
header = ''
do i = 1 to colCount
header ||= oosqlColumnName(stmt, i)~left(20)
end
say header
say '='~copies(80)
do while stepRC == .ooSQLite~ROW
row = ''
do i = 1 to colCount
row ||= oosqlColumnText(stmt, i)~left(20)
end
say row
stepRC = oosqlStep(stmt)
end
end
else do
say 'Unexpected error running query "SELECT * FROM foods ORDER BY name;"'
say 'Error code:' stepRC
end
say
ret = oosqlFinalize(stmt); say 'No err finalize ret:' ret
ret = oosqlClose(dbConn) ; say 'No err close ret:' ret
return ret
::requires 'ooSQLite.cls'