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SET AUTOCOMMIT
Name
SET AUTOCOMMIT—settheautocommitbehaviorofthecurrentsession
Synopsis
SET AUTOCOMMIT { = | TO } { ON | OFF }
Description
SET AUTOCOMMIT
sets the autocommit behaviorofthe current database session. Bydefault,em-
beddedSQLprogramsarenotinautocommitmode,so
COMMIT
needs tobeissuedexplicitlywhen
desired.Thiscommandcanchangethesessiontoautocommitmode,whereeachindividualstatement
iscommittedimplicitly.
Compatibility
SET AUTOCOMMIT
isanextensionofPostgreSQLECPG.
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SET CONNECTION
Name
SET CONNECTION—selectadatabaseconnection
Synopsis
SET CONNECTION [ TO | = ]
connection_name
Description
SET CONNECTION
sets the“current”databaseconnection,whichistheonethatallcommandsuse
unlessoverridden.
Parameters
connection_name
Adatabaseconnectionnameestablishedbythe
CONNECT
command.
DEFAULT
Settheconnectiontothedefaultconnection.
Examples
EXEC SQL SET CONNECTION TO con2;
EXEC SQL SET CONNECTION = con1;
Compatibility
SET CONNECTION
isspecifiedintheSQLstandard.
See Also
CONNECT,DISCONNECT
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SET DESCRIPTOR
Name
SET DESCRIPTOR—setinformationinanSQLdescriptorarea
Synopsis
SET DESCRIPTOR
descriptor_name descriptor_header_item
=
value
[, ... ]
SET DESCRIPTOR
descriptor_name
VALUE
number descriptor_item
=
value
[, ...]
Description
SET DESCRIPTOR
populatesanSQLdescriptorareawithvalues.Thedescriptorareaisthentypically
usedtobindparametersinapreparedqueryexecution.
Thiscommandhastwoforms:Thefirstformappliestothedescriptor“header”,whichisindependent
ofaparticulardatum.Thesecondformassignsvaluestoparticulardatums,identifiedbynumber.
Parameters
descriptor_name
Adescriptorname.
descriptor_header_item
Atokenidentifyingwhich header informationitemtoset.Only
COUNT
,toset the numberof
descriptoritems,iscurrentlysupported.
number
Thenumberofthedescriptoritemtoset.Thecountstartsat1.
descriptor_item
Atokenidentifyingwhichitemofinformationtosetinthedescriptor.SeeSection33.7.1fora
listofsupporteditems.
value
Avaluetostoreintothedescriptoritem.ThiscanbeanSQLconstantorahostvariable.
Examples
EXEC SQL SET DESCRIPTOR indesc COUNT = 1;
EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = 2;
EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = :val1;
EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val1, DATA = ’some string’;
EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val2null, DATA = :val2;
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SETDESCRIPTOR
Compatibility
SET DESCRIPTOR
isspecifiedintheSQLstandard.
See Also
ALLOCATEDESCRIPTOR,GETDESCRIPTOR
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TYPE
Name
TYPE—defineanewdatatype
Synopsis
TYPE
type_name
IS
ctype
Description
The
TYPE
commanddefinesanewCtype.Itisequivalenttoputtinga
typedef
intoadeclaresection.
Thiscommandisonlyrecognizedwhen
ecpg
isrunwiththe
-c
option.
Parameters
type_name
Thenameforthenewtype.ItmustbeavalidCtypename.
ctype
ACtypespecification.
Examples
EXEC SQL TYPE customer IS
struct
{
varchar name[50];
int
phone;
};
EXEC SQL TYPE cust_ind IS
struct ind
{
short
name_ind;
short
phone_ind;
};
EXEC SQL TYPE c IS char reference;
EXEC SQL TYPE ind IS union { int integer; short smallint; };
EXEC SQL TYPE intarray IS int[AMOUNT];
EXEC SQL TYPE str IS varchar[BUFFERSIZ];
EXEC SQL TYPE string IS char[11];
Hereisanexampleprogramthatuses
EXEC SQL TYPE
:
EXEC SQL WHENEVER SQLERROR SQLPRINT;
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TYPE
EXEC SQL TYPE tt IS
struct
{
varchar v[256];
int
i;
};
EXEC SQL TYPE tt_ind IS
struct ind {
short
v_ind;
short
i_ind;
};
int
main(void)
{
EXEC SQL BEGIN DECLARE SECTION;
tt t;
tt_ind t_ind;
EXEC SQL END DECLARE SECTION;
EXEC SQL CONNECT TO testdb AS con1;
EXEC SQL SELECT current_database(), 256 INTO :t:t_ind LIMIT 1;
printf("t.v = %s\n", t.v.arr);
printf("t.i = %d\n", t.i);
printf("t_ind.v_ind = %d\n", t_ind.v_ind);
printf("t_ind.i_ind = %d\n", t_ind.i_ind);
EXEC SQL DISCONNECT con1;
return 0;
}
Theoutputfromthisprogramlookslikethis:
t.v = testdb
t.i = 256
t_ind.v_ind = 0
t_ind.i_ind = 0
Compatibility
The
TYPE
commandisaPostgreSQLextension.
823
VAR
Name
VAR—defineavariable
Synopsis
VAR
varname
IS
ctype
Description
The
VAR
commandassignsanewCdatatypetoahostvariable.Thehostvariablemustbepreviously
declaredinadeclaresection.
Parameters
varname
ACvariablename.
ctype
ACtypespecification.
Examples
Exec sql begin declare section;
short a;
exec sql end declare section;
EXEC SQL VAR a IS int;
Compatibility
The
VAR
commandisaPostgreSQLextension.
824
WHENEVER
Name
WHENEVER—specifytheactiontobetakenwhenanSQLstatementcausesaspecificclass
conditiontoberaised
Synopsis
WHENEVER { NOT FOUND | SQLERROR | SQLWARNING }
action
Description
Defineabehaviorwhichiscalledonthespecialcases(Rowsnotfound,SQLwarningsorerrors)in
theresultofSQLexecution.
Parameters
SeeSection33.8.1foradescriptionoftheparameters.
Examples
EXEC SQL WHENEVER NOT FOUND CONTINUE;
EXEC SQL WHENEVER NOT FOUND DO BREAK;
EXEC SQL WHENEVER SQLWARNING SQLPRINT;
EXEC SQL WHENEVER SQLWARNING DO warn();
EXEC SQL WHENEVER SQLERROR sqlprint;
EXEC SQL WHENEVER SQLERROR CALL print2();
EXEC SQL WHENEVER SQLERROR DO handle_error("select");
EXEC SQL WHENEVER SQLERROR DO sqlnotice(NULL, NONO);
EXEC SQL WHENEVER SQLERROR DO sqlprint();
EXEC SQL WHENEVER SQLERROR GOTO error_label;
EXEC SQL WHENEVER SQLERROR STOP;
Atypicalapplicationistheuseof
WHENEVER NOT FOUND BREAK
tohandleloopingthroughresult
sets:
int
main(void)
{
EXEC SQL CONNECT TO testdb AS con1;
EXEC SQL ALLOCATE DESCRIPTOR d;
EXEC SQL DECLARE cur CURSOR FOR SELECT current_database(), ’hoge’, 256;
EXEC SQL OPEN cur;
/
*
when end of result set reached, break out of while loop
*
/
EXEC SQL WHENEVER NOT FOUND DO BREAK;
while (1)
{
825
WHENEVER
EXEC SQL FETCH NEXT FROM cur INTO SQL DESCRIPTOR d;
...
}
EXEC SQL CLOSE cur;
EXEC SQL COMMIT;
EXEC SQL DEALLOCATE DESCRIPTOR d;
EXEC SQL DISCONNECT ALL;
return 0;
}
Compatibility
WHENEVER
isspecifiedintheSQLstandard,butmostoftheactionsarePostgreSQLextensions.
826
Chapter33.ECPG-EmbeddedSQLinC
33.15. Informix Compatibility Mode
ecpg
canberuninaso-calledInformixcompatibilitymode.Ifthismodeisactive,ittriestobehave
asifitweretheInformixprecompilerforInformixE/SQL.Generallyspokenthiswillallowyouto
usethedollarsigninsteadofthe
EXEC SQL
primitivetointroduceembeddedSQLcommands.:
$int j = 3;
$CONNECT TO :dbname;
$CREATE TABLE test(i INT PRIMARY KEY, j INT);
$INSERT INTO test(i, j) VALUES (7, :j);
$COMMIT;
Note:Theremustnotbeanywhitespacebetweenthe
$
andafollowingpreprocessordirective,
thatis,
include
,
define
,
ifdef
,etc.Otherwise,thepreprocessorwillparsethetokenasahost
variable.
Therearetwocompatibilitymodes:
INFORMIX
,
INFORMIX_SE
Whenlinkingprogramsthatusethiscompatibilitymode,remembertolinkagainst
libcompat
that
isshippedwithECPG.
Besidesthepreviouslyexplainedsyntacticsugar,theInformixcompatibilitymodeportssomefunc-
tionsforinput,outputandtransformationofdataaswellasembeddedSQLstatementsknownfrom
E/SQLtoECPG.
InformixcompatibilitymodeiscloselyconnectedtothepgtypesliblibraryofECPG.pgtypeslibmaps
SQLdatatypes todatatypeswithintheChostprogramandmostoftheadditionalfunctionsofthe
InformixcompatibilitymodeallowyoutooperateonthoseChostprogramtypes.Notehoweverthat
theextentofthecompatibilityislimited.ItdoesnottrytocopyInformixbehavior;itallowsyoutodo
moreorlessthesameoperationsandgivesyoufunctionsthathavethesamenameandthesamebasic
behaviorbutitisnodrop-inreplacementifyouareusingInformixatthemoment.Moreover,some
ofthedatatypesaredifferent.Forexample,PostgreSQL’s datetimeandintervaltypesdonotknow
aboutrangeslikeforexample
YEAR TO MINUTE
soyouwon’tfindsupportinECPGforthateither.
33.15.1. AdditionalTypes
TheInformix-special"string"pseudo-typeforstoringright-trimmedcharacterstringdataisnowsup-
portedinInformix-modewithoutusing
typedef
.Infact,inInformix-mode,ECPGrefusestoprocess
sourcefilesthatcontain
typedef sometype string;
EXEC SQL BEGIN DECLARE SECTION;
string userid; /
*
this variable will contain trimmed data
*
/
EXEC SQL END DECLARE SECTION;
EXEC SQL FETCH MYCUR INTO :userid;
827
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