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LEGALNOTICE.html	2.62 KB	-rw-r--r--
acronyms.html	15.9 KB	-rw-r--r--
admin.html	12.27 KB	-rw-r--r--
adminpack.html	7.7 KB	-rw-r--r--
app-clusterdb.html	10.35 KB	-rw-r--r--
app-createdb.html	12.55 KB	-rw-r--r--
app-createlang.html	9.67 KB	-rw-r--r--
app-createuser.html	15.27 KB	-rw-r--r--
app-dropdb.html	9.42 KB	-rw-r--r--
app-droplang.html	9.41 KB	-rw-r--r--
app-dropuser.html	9.37 KB	-rw-r--r--
app-ecpg.html	8.51 KB	-rw-r--r--
app-initdb.html	15.04 KB	-rw-r--r--
app-pg-ctl.html	21.93 KB	-rw-r--r--
app-pg-dumpall.html	20.22 KB	-rw-r--r--
app-pgbasebackup.html	19.37 KB	-rw-r--r--
app-pgconfig.html	10.83 KB	-rw-r--r--
app-pgcontroldata.html	3.89 KB	-rw-r--r--
app-pgdump.html	42.93 KB	-rw-r--r--
app-pgreceivexlog.html	10.8 KB	-rw-r--r--
app-pgresetxlog.html	11.29 KB	-rw-r--r--
app-pgrestore.html	29.56 KB	-rw-r--r--
app-postgres.html	31.08 KB	-rw-r--r--
app-postmaster.html	2.93 KB	-rw-r--r--
app-psql.html	135.62 KB	-rw-r--r--
app-reindexdb.html	11.02 KB	-rw-r--r--
app-vacuumdb.html	12.32 KB	-rw-r--r--
appendixes.html	25.71 KB	-rw-r--r--
applevel-consistency.html	10.07 KB	-rw-r--r--
archive-recovery-settings.html	7.17 KB	-rw-r--r--
arrays.html	27.42 KB	-rw-r--r--
auth-delay.html	3.69 KB	-rw-r--r--
auth-methods.html	35.35 KB	-rw-r--r--
auth-pg-hba-conf.html	29.06 KB	-rw-r--r--
auth-username-maps.html	8.4 KB	-rw-r--r--
auto-explain.html	9.66 KB	-rw-r--r--
backup-dump.html	15.55 KB	-rw-r--r--
backup-file.html	7.81 KB	-rw-r--r--
backup.html	4.38 KB	-rw-r--r--
biblio.html	11.28 KB	-rw-r--r--
bki-commands.html	9.42 KB	-rw-r--r--
bki-example.html	2.98 KB	-rw-r--r--
bki-format.html	3.38 KB	-rw-r--r--
bki-structure.html	4.22 KB	-rw-r--r--
bki.html	4.23 KB	-rw-r--r--
bookindex.html	237.47 KB	-rw-r--r--
btree-gin.html	4.49 KB	-rw-r--r--
btree-gist.html	6.72 KB	-rw-r--r--
bug-reporting.html	18.21 KB	-rw-r--r--
catalog-pg-aggregate.html	5.37 KB	-rw-r--r--
catalog-pg-am.html	10.3 KB	-rw-r--r--
catalog-pg-amop.html	7.42 KB	-rw-r--r--
catalog-pg-amproc.html	4.77 KB	-rw-r--r--
catalog-pg-attrdef.html	4.26 KB	-rw-r--r--
catalog-pg-attribute.html	10.05 KB	-rw-r--r--
catalog-pg-auth-members.html	4.16 KB	-rw-r--r--
catalog-pg-authid.html	6.66 KB	-rw-r--r--
catalog-pg-cast.html	6.79 KB	-rw-r--r--
catalog-pg-class.html	12.36 KB	-rw-r--r--
catalog-pg-collation.html	5.76 KB	-rw-r--r--
catalog-pg-constraint.html	11.31 KB	-rw-r--r--
catalog-pg-conversion.html	4.33 KB	-rw-r--r--
catalog-pg-database.html	6.86 KB	-rw-r--r--
catalog-pg-db-role-setting.htm...	3.97 KB	-rw-r--r--
catalog-pg-default-acl.html	5.14 KB	-rw-r--r--
catalog-pg-depend.html	8.43 KB	-rw-r--r--
catalog-pg-description.html	4.37 KB	-rw-r--r--
catalog-pg-enum.html	4.61 KB	-rw-r--r--
catalog-pg-extension.html	5.16 KB	-rw-r--r--
catalog-pg-foreign-data-wrappe...	4.83 KB	-rw-r--r--
catalog-pg-foreign-server.html	4.58 KB	-rw-r--r--
catalog-pg-foreign-table.html	3.94 KB	-rw-r--r--
catalog-pg-index.html	8.66 KB	-rw-r--r--
catalog-pg-inherits.html	3.8 KB	-rw-r--r--
catalog-pg-language.html	5.81 KB	-rw-r--r--
catalog-pg-largeobject-metadat...	3.54 KB	-rw-r--r--
catalog-pg-largeobject.html	5.03 KB	-rw-r--r--
catalog-pg-namespace.html	3.66 KB	-rw-r--r--
catalog-pg-opclass.html	5.73 KB	-rw-r--r--
catalog-pg-operator.html	6.49 KB	-rw-r--r--
catalog-pg-opfamily.html	4.7 KB	-rw-r--r--
catalog-pg-pltemplate.html	5.24 KB	-rw-r--r--
catalog-pg-proc.html	13.09 KB	-rw-r--r--
catalog-pg-range.html	5.06 KB	-rw-r--r--
catalog-pg-rewrite.html	5.26 KB	-rw-r--r--
catalog-pg-seclabel.html	4.41 KB	-rw-r--r--
catalog-pg-shdepend.html	6.88 KB	-rw-r--r--
catalog-pg-shdescription.html	4.15 KB	-rw-r--r--
catalog-pg-shseclabel.html	4.3 KB	-rw-r--r--
catalog-pg-statistic.html	9.31 KB	-rw-r--r--
catalog-pg-tablespace.html	4.06 KB	-rw-r--r--
catalog-pg-trigger.html	8.09 KB	-rw-r--r--
catalog-pg-ts-config-map.html	4.09 KB	-rw-r--r--
catalog-pg-ts-config.html	4.38 KB	-rw-r--r--
catalog-pg-ts-dict.html	4.61 KB	-rw-r--r--
catalog-pg-ts-parser.html	4.96 KB	-rw-r--r--
catalog-pg-ts-template.html	4.16 KB	-rw-r--r--
catalog-pg-type.html	19.44 KB	-rw-r--r--
catalog-pg-user-mapping.html	3.76 KB	-rw-r--r--
catalogs-overview.html	10.19 KB	-rw-r--r--
catalogs.html	10.14 KB	-rw-r--r--
charset.html	4.06 KB	-rw-r--r--
chkpass.html	4.29 KB	-rw-r--r--
citext.html	10.89 KB	-rw-r--r--
client-authentication-problems...	4.13 KB	-rw-r--r--
client-authentication.html	5.78 KB	-rw-r--r--
client-interfaces.html	13.4 KB	-rw-r--r--
collation.html	13.89 KB	-rw-r--r--
config-setting.html	10.88 KB	-rw-r--r--
connect-estab.html	4.21 KB	-rw-r--r--
continuous-archiving.html	48.66 KB	-rw-r--r--
contrib-dblink-build-sql-delet...	5.32 KB	-rw-r--r--
contrib-dblink-build-sql-inser...	5.91 KB	-rw-r--r--
contrib-dblink-build-sql-updat...	6.13 KB	-rw-r--r--
contrib-dblink-cancel-query.ht...	3.73 KB	-rw-r--r--
contrib-dblink-close.html	4.54 KB	-rw-r--r--
contrib-dblink-connect-u.html	4.38 KB	-rw-r--r--
contrib-dblink-connect.html	7.15 KB	-rw-r--r--
contrib-dblink-disconnect.html	3.63 KB	-rw-r--r--
contrib-dblink-error-message.h...	3.43 KB	-rw-r--r--
contrib-dblink-exec.html	5.34 KB	-rw-r--r--
contrib-dblink-fetch.html	5.84 KB	-rw-r--r--
contrib-dblink-function.html	8.43 KB	-rw-r--r--
contrib-dblink-get-connections...	3.13 KB	-rw-r--r--
contrib-dblink-get-notify.html	4.07 KB	-rw-r--r--
contrib-dblink-get-pkey.html	4.39 KB	-rw-r--r--
contrib-dblink-get-result.html	6.8 KB	-rw-r--r--
contrib-dblink-is-busy.html	3.41 KB	-rw-r--r--
contrib-dblink-open.html	5.34 KB	-rw-r--r--
contrib-dblink-send-query.html	4.07 KB	-rw-r--r--
contrib-prog-client.html	3.35 KB	-rw-r--r--
contrib-prog-server.html	3.75 KB	-rw-r--r--
contrib-prog.html	3.24 KB	-rw-r--r--
contrib-spi.html	10.97 KB	-rw-r--r--
contrib.html	8.7 KB	-rw-r--r--
creating-cluster.html	12.17 KB	-rw-r--r--
cube.html	15.57 KB	-rw-r--r--
database-roles.html	5.95 KB	-rw-r--r--
datatype-binary.html	12.59 KB	-rw-r--r--
datatype-bit.html	4.98 KB	-rw-r--r--
datatype-boolean.html	5.14 KB	-rw-r--r--
datatype-character.html	11.61 KB	-rw-r--r--
datatype-datetime.html	49.57 KB	-rw-r--r--
datatype-enum.html	6.28 KB	-rw-r--r--
datatype-geometric.html	12.21 KB	-rw-r--r--
datatype-json.html	3.36 KB	-rw-r--r--
datatype-money.html	5.35 KB	-rw-r--r--
datatype-net-types.html	10.18 KB	-rw-r--r--
datatype-numeric.html	21.83 KB	-rw-r--r--
datatype-oid.html	9.46 KB	-rw-r--r--
datatype-pseudo.html	7.11 KB	-rw-r--r--
datatype-textsearch.html	9.8 KB	-rw-r--r--
datatype-uuid.html	4.45 KB	-rw-r--r--
datatype-xml.html	11.07 KB	-rw-r--r--
datatype.html	16.22 KB	-rw-r--r--
datetime-appendix.html	3.44 KB	-rw-r--r--
datetime-config-files.html	8.77 KB	-rw-r--r--
datetime-input-rules.html	6.6 KB	-rw-r--r--
datetime-keywords.html	4.98 KB	-rw-r--r--
datetime-units-history.html	7.46 KB	-rw-r--r--
dblink.html	5.2 KB	-rw-r--r--
ddl-alter.html	10.25 KB	-rw-r--r--
ddl-basics.html	7.63 KB	-rw-r--r--
ddl-constraints.html	22.26 KB	-rw-r--r--
ddl-default.html	4.43 KB	-rw-r--r--
ddl-depend.html	6.35 KB	-rw-r--r--
ddl-foreign-data.html	4.38 KB	-rw-r--r--
ddl-inherit.html	14.95 KB	-rw-r--r--
ddl-others.html	3.01 KB	-rw-r--r--
ddl-partitioning.html	27.11 KB	-rw-r--r--
ddl-priv.html	5.92 KB	-rw-r--r--
ddl-schemas.html	17.62 KB	-rw-r--r--
ddl-system-columns.html	7.86 KB	-rw-r--r--
ddl.html	6.23 KB	-rw-r--r--
dict-int.html	4.68 KB	-rw-r--r--
dict-xsyn.html	6.33 KB	-rw-r--r--
different-replication-solution...	14.45 KB	-rw-r--r--
disk-full.html	3.43 KB	-rw-r--r--
disk-usage.html	5.53 KB	-rw-r--r--
diskusage.html	2.61 KB	-rw-r--r--
dml-delete.html	3.48 KB	-rw-r--r--
dml-insert.html	5.67 KB	-rw-r--r--
dml-returning.html	4.98 KB	-rw-r--r--
dml-update.html	5.43 KB	-rw-r--r--
dml.html	2.88 KB	-rw-r--r--
docguide-authoring.html	6.6 KB	-rw-r--r--
docguide-build.html	14.92 KB	-rw-r--r--
docguide-docbook.html	3.76 KB	-rw-r--r--
docguide-style.html	7.25 KB	-rw-r--r--
docguide-toolsets.html	20.2 KB	-rw-r--r--
docguide.html	3.54 KB	-rw-r--r--
dummy-seclabel.html	4.26 KB	-rw-r--r--
dynamic-trace.html	26.6 KB	-rw-r--r--
earthdistance.html	8.6 KB	-rw-r--r--
ecpg-commands.html	9.3 KB	-rw-r--r--
ecpg-concept.html	4.86 KB	-rw-r--r--
ecpg-connect.html	10.57 KB	-rw-r--r--
ecpg-cpp.html	9.4 KB	-rw-r--r--
ecpg-descriptors.html	34.09 KB	-rw-r--r--
ecpg-develop.html	7.78 KB	-rw-r--r--
ecpg-dynamic.html	6.36 KB	-rw-r--r--
ecpg-errors.html	25.13 KB	-rw-r--r--
ecpg-informix-compat.html	51.52 KB	-rw-r--r--
ecpg-library.html	5.66 KB	-rw-r--r--
ecpg-lo.html	5.4 KB	-rw-r--r--
ecpg-pgtypes.html	53.18 KB	-rw-r--r--
ecpg-preproc.html	8.77 KB	-rw-r--r--
ecpg-process.html	5.26 KB	-rw-r--r--
ecpg-sql-allocate-descriptor.h...	3.89 KB	-rw-r--r--
ecpg-sql-commands.html	4.59 KB	-rw-r--r--
ecpg-sql-connect.html	9.16 KB	-rw-r--r--
ecpg-sql-deallocate-descriptor...	3.68 KB	-rw-r--r--
ecpg-sql-declare.html	5.27 KB	-rw-r--r--
ecpg-sql-describe.html	4.49 KB	-rw-r--r--
ecpg-sql-disconnect.html	4.62 KB	-rw-r--r--
ecpg-sql-execute-immediate.htm...	3.79 KB	-rw-r--r--
ecpg-sql-get-descriptor.html	7.53 KB	-rw-r--r--
ecpg-sql-open.html	4.53 KB	-rw-r--r--
ecpg-sql-prepare.html	4.08 KB	-rw-r--r--
ecpg-sql-set-autocommit.html	3.25 KB	-rw-r--r--
ecpg-sql-set-connection.html	3.84 KB	-rw-r--r--
ecpg-sql-set-descriptor.html	5.38 KB	-rw-r--r--
ecpg-sql-type.html	4.91 KB	-rw-r--r--
ecpg-sql-var.html	3.46 KB	-rw-r--r--
ecpg-sql-whenever.html	4.58 KB	-rw-r--r--
ecpg-variables.html	39.34 KB	-rw-r--r--
ecpg.html	10.1 KB	-rw-r--r--
encryption-options.html	7.32 KB	-rw-r--r--
errcodes-appendix.html	36.1 KB	-rw-r--r--
error-message-reporting.html	13.79 KB	-rw-r--r--
error-style-guide.html	16.38 KB	-rw-r--r--
event-log-registration.html	4.09 KB	-rw-r--r--
executor.html	6.46 KB	-rw-r--r--
explicit-joins.html	10.76 KB	-rw-r--r--
explicit-locking.html	24.49 KB	-rw-r--r--
extend-extensions.html	31.67 KB	-rw-r--r--
extend-how.html	4.45 KB	-rw-r--r--
extend-pgxs.html	11.49 KB	-rw-r--r--
extend-type-system.html	9.87 KB	-rw-r--r--
extend.html	9.75 KB	-rw-r--r--
external-admin-tools.html	2.66 KB	-rw-r--r--
external-extensions.html	3.19 KB	-rw-r--r--
external-interfaces.html	5.38 KB	-rw-r--r--
external-pl.html	4.56 KB	-rw-r--r--
external-projects.html	2.93 KB	-rw-r--r--
fdw-callbacks.html	12.6 KB	-rw-r--r--
fdw-functions.html	4.39 KB	-rw-r--r--
fdw-helpers.html	5.85 KB	-rw-r--r--
fdw-planning.html	9.61 KB	-rw-r--r--
fdwhandler.html	3.9 KB	-rw-r--r--
features-sql-standard.html	38.19 KB	-rw-r--r--
features.html	7.39 KB	-rw-r--r--
file-fdw.html	7.53 KB	-rw-r--r--
functions-admin.html	49.21 KB	-rw-r--r--
functions-aggregate.html	21.3 KB	-rw-r--r--
functions-array.html	13.2 KB	-rw-r--r--
functions-binarystring.html	12.29 KB	-rw-r--r--
functions-bitstring.html	6.63 KB	-rw-r--r--
functions-comparison.html	10.39 KB	-rw-r--r--
functions-comparisons.html	13.21 KB	-rw-r--r--
functions-conditional.html	10.75 KB	-rw-r--r--
functions-datetime.html	47.17 KB	-rw-r--r--
functions-enum.html	5.36 KB	-rw-r--r--
functions-formatting.html	34.57 KB	-rw-r--r--
functions-geometry.html	19.87 KB	-rw-r--r--
functions-info.html	57.28 KB	-rw-r--r--
functions-json.html	3.72 KB	-rw-r--r--
functions-logical.html	4.56 KB	-rw-r--r--
functions-matching.html	73.95 KB	-rw-r--r--
functions-math.html	19.92 KB	-rw-r--r--
functions-net.html	13.19 KB	-rw-r--r--
functions-range.html	10.6 KB	-rw-r--r--
functions-sequence.html	12.62 KB	-rw-r--r--
functions-srf.html	8.63 KB	-rw-r--r--
functions-string.html	57.67 KB	-rw-r--r--
functions-subquery.html	16 KB	-rw-r--r--
functions-textsearch.html	20.01 KB	-rw-r--r--
functions-trigger.html	4.44 KB	-rw-r--r--
functions-window.html	11.8 KB	-rw-r--r--
functions-xml.html	31.42 KB	-rw-r--r--
functions.html	9.71 KB	-rw-r--r--
fuzzystrmatch.html	7.87 KB	-rw-r--r--
geqo-biblio.html	3.38 KB	-rw-r--r--
geqo-intro.html	4.31 KB	-rw-r--r--
geqo-intro2.html	5.5 KB	-rw-r--r--
geqo-pg-intro.html	8.58 KB	-rw-r--r--
geqo.html	3.53 KB	-rw-r--r--
gin-examples.html	3.24 KB	-rw-r--r--
gin-extensibility.html	14.06 KB	-rw-r--r--
gin-implementation.html	6.41 KB	-rw-r--r--
gin-intro.html	4.55 KB	-rw-r--r--
gin-limit.html	2.75 KB	-rw-r--r--
gin-tips.html	5.58 KB	-rw-r--r--
gin.html	2.86 KB	-rw-r--r--
gist-examples.html	3.66 KB	-rw-r--r--
gist-extensibility.html	23.78 KB	-rw-r--r--
gist-implementation.html	4 KB	-rw-r--r--
gist-intro.html	3.53 KB	-rw-r--r--
gist.html	2.62 KB	-rw-r--r--
git.html	4.46 KB	-rw-r--r--
high-availability.html	7.52 KB	-rw-r--r--
history.html	11.64 KB	-rw-r--r--
hot-standby.html	35.2 KB	-rw-r--r--
hstore.html	22.1 KB	-rw-r--r--
index-catalog.html	7.81 KB	-rw-r--r--
index-cost-estimation.html	9.76 KB	-rw-r--r--
index-functions.html	18.67 KB	-rw-r--r--
index-locking.html	7.86 KB	-rw-r--r--
index-scanning.html	10.46 KB	-rw-r--r--
index-unique-checks.html	8.98 KB	-rw-r--r--
index.html	7.88 KB	-rw-r--r--
indexam.html	5.12 KB	-rw-r--r--
indexes-bitmap-scans.html	6.43 KB	-rw-r--r--
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indexes-examine.html	6.99 KB	-rw-r--r--
indexes-expressional.html	4.7 KB	-rw-r--r--
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indexes-ordering.html	6.33 KB	-rw-r--r--
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indexes-types.html	9.99 KB	-rw-r--r--
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information-schema.html	10.92 KB	-rw-r--r--
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infoschema-character-sets.html	6.88 KB	-rw-r--r--
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infoschema-columns.html	17.21 KB	-rw-r--r--
infoschema-constraint-column-u...	4.76 KB	-rw-r--r--
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infoschema-datatypes.html	4.13 KB	-rw-r--r--
infoschema-domain-constraints....	4.55 KB	-rw-r--r--
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infoschema-enabled-roles.html	3.69 KB	-rw-r--r--
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Code Editor : plpgsql-cursors.html

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><TD
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>Chapter 39. <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> - <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Procedural Language</TD
><TD
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><HR
ALIGN="LEFT"
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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="PLPGSQL-CURSORS"
>39.7. Cursors</A
></H1
><P
>    Rather than executing a whole query at once, it is possible to set
    up a <I
CLASS="FIRSTTERM"
>cursor</I
> that encapsulates the query, and then read
    the query result a few rows at a time. One reason for doing this is
    to avoid memory overrun when the result contains a large number of
    rows. (However, <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> users do not normally need
    to worry about that, since <TT
CLASS="LITERAL"
>FOR</TT
> loops automatically use a cursor
    internally to avoid memory problems.) A more interesting usage is to
    return a reference to a cursor that a function has created, allowing the
    caller to read the rows. This provides an efficient way to return
    large row sets from functions.
   </P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="PLPGSQL-CURSOR-DECLARATIONS"
>39.7.1. Declaring Cursor Variables</A
></H2
><P
>     All access to cursors in <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> goes through
     cursor variables, which are always of the special data type
     <TT
CLASS="TYPE"
>refcursor</TT
>.  One way to create a cursor variable
     is just to declare it as a variable of type <TT
CLASS="TYPE"
>refcursor</TT
>.
     Another way is to use the cursor declaration syntax,
     which in general is:
</P><PRE
CLASS="SYNOPSIS"
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> [<SPAN
CLASS="OPTIONAL"
> [<SPAN
CLASS="OPTIONAL"
> NO </SPAN
>] SCROLL </SPAN
>] CURSOR [<SPAN
CLASS="OPTIONAL"
> ( <TT
CLASS="REPLACEABLE"
><I
>arguments</I
></TT
> ) </SPAN
>] FOR <TT
CLASS="REPLACEABLE"
><I
>query</I
></TT
>;</PRE
><P>
     (<TT
CLASS="LITERAL"
>FOR</TT
> can be replaced by <TT
CLASS="LITERAL"
>IS</TT
> for
     <SPAN
CLASS="PRODUCTNAME"
>Oracle</SPAN
> compatibility.)
     If <TT
CLASS="LITERAL"
>SCROLL</TT
> is specified, the cursor will be capable of
     scrolling backward; if <TT
CLASS="LITERAL"
>NO SCROLL</TT
> is specified, backward
     fetches will be rejected; if neither specification appears, it is
     query-dependent whether backward fetches will be allowed.
     <TT
CLASS="REPLACEABLE"
><I
>arguments</I
></TT
>, if specified, is a
     comma-separated list of pairs <TT
CLASS="LITERAL"
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
>
     <TT
CLASS="REPLACEABLE"
><I
>datatype</I
></TT
></TT
> that define names to be
     replaced by parameter values in the given query.  The actual
     values to substitute for these names will be specified later,
     when the cursor is opened.
    </P
><P
>     Some examples:
</P><PRE
CLASS="PROGRAMLISTING"
>DECLARE
    curs1 refcursor;
    curs2 CURSOR FOR SELECT * FROM tenk1;
    curs3 CURSOR (key integer) FOR SELECT * FROM tenk1 WHERE unique1 = key;</PRE
><P>
     All three of these variables have the data type <TT
CLASS="TYPE"
>refcursor</TT
>,
     but the first can be used with any query, while the second has
     a fully specified query already <I
CLASS="FIRSTTERM"
>bound</I
> to it, and the last
     has a parameterized query bound to it.  (<TT
CLASS="LITERAL"
>key</TT
> will be
     replaced by an integer parameter value when the cursor is opened.)
     The variable <TT
CLASS="LITERAL"
>curs1</TT
>
     is said to be <I
CLASS="FIRSTTERM"
>unbound</I
> since it is not bound to
     any particular query.
    </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="PLPGSQL-CURSOR-OPENING"
>39.7.2. Opening Cursors</A
></H2
><P
>     Before a cursor can be used to retrieve rows, it must be
     <I
CLASS="FIRSTTERM"
>opened</I
>. (This is the equivalent action to the SQL
     command <TT
CLASS="COMMAND"
>DECLARE CURSOR</TT
>.) <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> has
     three forms of the <TT
CLASS="COMMAND"
>OPEN</TT
> statement, two of which use unbound
     cursor variables while the third uses a bound cursor variable.
    </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>      Bound cursor variables can also be used without explicitly opening the cursor,
      via the <TT
CLASS="COMMAND"
>FOR</TT
> statement described in
      <A
HREF="plpgsql-cursors.html#PLPGSQL-CURSOR-FOR-LOOP"
>Section 39.7.4</A
>.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN57411"
>39.7.2.1. <TT
CLASS="COMMAND"
>OPEN FOR</TT
> <TT
CLASS="REPLACEABLE"
><I
>query</I
></TT
></A
></H3
><PRE
CLASS="SYNOPSIS"
>OPEN <TT
CLASS="REPLACEABLE"
><I
>unbound_cursorvar</I
></TT
> [<SPAN
CLASS="OPTIONAL"
> [<SPAN
CLASS="OPTIONAL"
> NO </SPAN
>] SCROLL </SPAN
>] FOR <TT
CLASS="REPLACEABLE"
><I
>query</I
></TT
>;</PRE
><P
>        The cursor variable is opened and given the specified query to
        execute.  The cursor cannot be open already, and it must have been
        declared as an unbound cursor variable (that is, as a simple
        <TT
CLASS="TYPE"
>refcursor</TT
> variable).  The query must be a
        <TT
CLASS="COMMAND"
>SELECT</TT
>, or something else that returns rows
        (such as <TT
CLASS="COMMAND"
>EXPLAIN</TT
>).  The query
        is treated in the same way as other SQL commands in
        <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
>: <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
>
        variable names are substituted, and the query plan is cached for
        possible reuse.  When a <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
>
        variable is substituted into the cursor query, the value that is
        substituted is the one it has at the time of the <TT
CLASS="COMMAND"
>OPEN</TT
>;
        subsequent changes to the variable will not affect the cursor's
        behavior.
        The <TT
CLASS="LITERAL"
>SCROLL</TT
> and <TT
CLASS="LITERAL"
>NO SCROLL</TT
>
        options have the same meanings as for a bound cursor.
       </P
><P
>        An example:
</P><PRE
CLASS="PROGRAMLISTING"
>OPEN curs1 FOR SELECT * FROM foo WHERE key = mykey;</PRE
><P>
       </P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN57432"
>39.7.2.2. <TT
CLASS="COMMAND"
>OPEN FOR EXECUTE</TT
></A
></H3
><PRE
CLASS="SYNOPSIS"
>OPEN <TT
CLASS="REPLACEABLE"
><I
>unbound_cursorvar</I
></TT
> [<SPAN
CLASS="OPTIONAL"
> [<SPAN
CLASS="OPTIONAL"
> NO </SPAN
>] SCROLL </SPAN
>] FOR EXECUTE <TT
CLASS="REPLACEABLE"
><I
>query_string</I
></TT
>
                                     [<SPAN
CLASS="OPTIONAL"
> USING <TT
CLASS="REPLACEABLE"
><I
>expression</I
></TT
> [<SPAN
CLASS="OPTIONAL"
>, ... </SPAN
>] </SPAN
>];</PRE
><P
>          The cursor variable is opened and given the specified query to
          execute.  The cursor cannot be open already, and it must have been
          declared as an unbound cursor variable (that is, as a simple
          <TT
CLASS="TYPE"
>refcursor</TT
> variable).  The query is specified as a string
          expression, in the same way as in the <TT
CLASS="COMMAND"
>EXECUTE</TT
>
          command.  As usual, this gives flexibility so the query plan can vary
          from one run to the next (see <A
HREF="plpgsql-implementation.html#PLPGSQL-PLAN-CACHING"
>Section 39.10.2</A
>),
          and it also means that variable substitution is not done on the
          command string. As with <TT
CLASS="COMMAND"
>EXECUTE</TT
>, parameter values
          can be inserted into the dynamic command via <TT
CLASS="LITERAL"
>USING</TT
>.
          The <TT
CLASS="LITERAL"
>SCROLL</TT
> and
          <TT
CLASS="LITERAL"
>NO SCROLL</TT
> options have the same meanings as for a bound
          cursor.
         </P
><P
>        An example:
</P><PRE
CLASS="PROGRAMLISTING"
>OPEN curs1 FOR EXECUTE 'SELECT * FROM ' || quote_ident(tabname)
                                        || ' WHERE col1 = $1' USING keyvalue;</PRE
><P>
        In this example, the table name is inserted into the query textually,
        so use of <CODE
CLASS="FUNCTION"
>quote_ident()</CODE
> is recommended to guard against
        SQL injection.  The comparison value for <TT
CLASS="LITERAL"
>col1</TT
> is inserted
        via a <TT
CLASS="LITERAL"
>USING</TT
> parameter, so it needs no quoting.
       </P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="PLPGSQL-OPEN-BOUND-CURSOR"
>39.7.2.3. Opening a Bound Cursor</A
></H3
><PRE
CLASS="SYNOPSIS"
>OPEN <TT
CLASS="REPLACEABLE"
><I
>bound_cursorvar</I
></TT
> [<SPAN
CLASS="OPTIONAL"
> ( [<SPAN
CLASS="OPTIONAL"
> <TT
CLASS="REPLACEABLE"
><I
>argument_name</I
></TT
> := </SPAN
>] <TT
CLASS="REPLACEABLE"
><I
>argument_value</I
></TT
> [<SPAN
CLASS="OPTIONAL"
>, ...</SPAN
>] ) </SPAN
>];</PRE
><P
>          This form of <TT
CLASS="COMMAND"
>OPEN</TT
> is used to open a cursor
          variable whose query was bound to it when it was declared.  The
          cursor cannot be open already.  A list of actual argument value
          expressions must appear if and only if the cursor was declared to
          take arguments.  These values will be substituted in the query.
         </P
><P
>          The query plan for a bound cursor is always considered cacheable;
          there is no equivalent of <TT
CLASS="COMMAND"
>EXECUTE</TT
> in this case.
          Notice that <TT
CLASS="LITERAL"
>SCROLL</TT
> and <TT
CLASS="LITERAL"
>NO SCROLL</TT
> cannot be
          specified in <TT
CLASS="COMMAND"
>OPEN</TT
>, as the cursor's scrolling
          behavior was already determined.
         </P
><P
>          Argument values can be passed using either <I
CLASS="FIRSTTERM"
>positional</I
>
          or <I
CLASS="FIRSTTERM"
>named</I
> notation.  In positional
          notation, all arguments are specified in order.  In named notation,
          each argument's name is specified using <TT
CLASS="LITERAL"
>:=</TT
> to
          separate it from the argument expression. Similar to calling
          functions, described in <A
HREF="sql-syntax-calling-funcs.html"
>Section 4.3</A
>, it
          is also allowed to mix positional and named notation.
         </P
><P
>          Examples (these use the cursor declaration examples above):
</P><PRE
CLASS="PROGRAMLISTING"
>OPEN curs2;
OPEN curs3(42);
OPEN curs3(key := 42);</PRE
><P>
         </P
><P
>          Because variable substitution is done on a bound cursor's query,
          there are really two ways to pass values into the cursor: either
          with an explicit argument to <TT
CLASS="COMMAND"
>OPEN</TT
>, or implicitly by
          referencing a <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> variable in the query.
          However, only variables declared before the bound cursor was
          declared will be substituted into it.  In either case the value to
          be passed is determined at the time of the <TT
CLASS="COMMAND"
>OPEN</TT
>.
          For example, another way to get the same effect as the
          <TT
CLASS="LITERAL"
>curs3</TT
> example above is
</P><PRE
CLASS="PROGRAMLISTING"
>DECLARE
    key integer;
    curs4 CURSOR FOR SELECT * FROM tenk1 WHERE unique1 = key;
BEGIN
    key := 42;
    OPEN curs4;</PRE
><P>
         </P
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="PLPGSQL-CURSOR-USING"
>39.7.3. Using Cursors</A
></H2
><P
>     Once a cursor has been opened, it can be manipulated with the
     statements described here.
    </P
><P
>     These manipulations need not occur in the same function that
     opened the cursor to begin with.  You can return a <TT
CLASS="TYPE"
>refcursor</TT
>
     value out of a function and let the caller operate on the cursor.
     (Internally, a <TT
CLASS="TYPE"
>refcursor</TT
> value is simply the string name
     of a so-called portal containing the active query for the cursor.  This name
     can be passed around, assigned to other <TT
CLASS="TYPE"
>refcursor</TT
> variables,
     and so on, without disturbing the portal.)
    </P
><P
>     All portals are implicitly closed at transaction end.  Therefore
     a <TT
CLASS="TYPE"
>refcursor</TT
> value is usable to reference an open cursor
     only until the end of the transaction.
    </P
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN57494"
>39.7.3.1. <TT
CLASS="LITERAL"
>FETCH</TT
></A
></H3
><PRE
CLASS="SYNOPSIS"
>FETCH [<SPAN
CLASS="OPTIONAL"
> <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> { FROM | IN } </SPAN
>] <TT
CLASS="REPLACEABLE"
><I
>cursor</I
></TT
> INTO <TT
CLASS="REPLACEABLE"
><I
>target</I
></TT
>;</PRE
><P
>     <TT
CLASS="COMMAND"
>FETCH</TT
> retrieves the next row from the
     cursor into a target, which might be a row variable, a record
     variable, or a comma-separated list of simple variables, just like
     <TT
CLASS="COMMAND"
>SELECT INTO</TT
>.  If there is no next row, the
     target is set to NULL(s).  As with <TT
CLASS="COMMAND"
>SELECT
     INTO</TT
>, the special variable <TT
CLASS="LITERAL"
>FOUND</TT
> can
     be checked to see whether a row was obtained or not.
    </P
><P
>     The <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> clause can be any of the
     variants allowed in the SQL <A
HREF="sql-fetch.html"
>FETCH</A
>
     command except the ones that can fetch
     more than one row; namely, it can be
     <TT
CLASS="LITERAL"
>NEXT</TT
>,
     <TT
CLASS="LITERAL"
>PRIOR</TT
>,
     <TT
CLASS="LITERAL"
>FIRST</TT
>,
     <TT
CLASS="LITERAL"
>LAST</TT
>,
     <TT
CLASS="LITERAL"
>ABSOLUTE</TT
> <TT
CLASS="REPLACEABLE"
><I
>count</I
></TT
>,
     <TT
CLASS="LITERAL"
>RELATIVE</TT
> <TT
CLASS="REPLACEABLE"
><I
>count</I
></TT
>,
     <TT
CLASS="LITERAL"
>FORWARD</TT
>, or
     <TT
CLASS="LITERAL"
>BACKWARD</TT
>.
     Omitting <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> is the same
     as specifying <TT
CLASS="LITERAL"
>NEXT</TT
>.
     <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> values that require moving
     backward are likely to fail unless the cursor was declared or opened
     with the <TT
CLASS="LITERAL"
>SCROLL</TT
> option.
    </P
><P
>     <TT
CLASS="REPLACEABLE"
><I
>cursor</I
></TT
> must be the name of a <TT
CLASS="TYPE"
>refcursor</TT
>
     variable that references an open cursor portal.
    </P
><P
>     Examples:
</P><PRE
CLASS="PROGRAMLISTING"
>FETCH curs1 INTO rowvar;
FETCH curs2 INTO foo, bar, baz;
FETCH LAST FROM curs3 INTO x, y;
FETCH RELATIVE -2 FROM curs4 INTO x;</PRE
><P>
       </P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN57529"
>39.7.3.2. <TT
CLASS="LITERAL"
>MOVE</TT
></A
></H3
><PRE
CLASS="SYNOPSIS"
>MOVE [<SPAN
CLASS="OPTIONAL"
> <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> { FROM | IN } </SPAN
>] <TT
CLASS="REPLACEABLE"
><I
>cursor</I
></TT
>;</PRE
><P
>     <TT
CLASS="COMMAND"
>MOVE</TT
> repositions a cursor without retrieving
     any data. <TT
CLASS="COMMAND"
>MOVE</TT
> works exactly like the
     <TT
CLASS="COMMAND"
>FETCH</TT
> command, except it only repositions the
     cursor and does not return the row moved to. As with <TT
CLASS="COMMAND"
>SELECT
     INTO</TT
>, the special variable <TT
CLASS="LITERAL"
>FOUND</TT
> can
     be checked to see whether there was a next row to move to.
    </P
><P
>     The <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> clause can be any of the
     variants allowed in the SQL <A
HREF="sql-fetch.html"
>FETCH</A
>
     command, namely
     <TT
CLASS="LITERAL"
>NEXT</TT
>,
     <TT
CLASS="LITERAL"
>PRIOR</TT
>,
     <TT
CLASS="LITERAL"
>FIRST</TT
>,
     <TT
CLASS="LITERAL"
>LAST</TT
>,
     <TT
CLASS="LITERAL"
>ABSOLUTE</TT
> <TT
CLASS="REPLACEABLE"
><I
>count</I
></TT
>,
     <TT
CLASS="LITERAL"
>RELATIVE</TT
> <TT
CLASS="REPLACEABLE"
><I
>count</I
></TT
>,
     <TT
CLASS="LITERAL"
>ALL</TT
>,
     <TT
CLASS="LITERAL"
>FORWARD</TT
> [<SPAN
CLASS="OPTIONAL"
> <TT
CLASS="REPLACEABLE"
><I
>count</I
></TT
> | <TT
CLASS="LITERAL"
>ALL</TT
> </SPAN
>], or
     <TT
CLASS="LITERAL"
>BACKWARD</TT
> [<SPAN
CLASS="OPTIONAL"
> <TT
CLASS="REPLACEABLE"
><I
>count</I
></TT
> | <TT
CLASS="LITERAL"
>ALL</TT
> </SPAN
>].
     Omitting <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> is the same
     as specifying <TT
CLASS="LITERAL"
>NEXT</TT
>.
     <TT
CLASS="REPLACEABLE"
><I
>direction</I
></TT
> values that require moving
     backward are likely to fail unless the cursor was declared or opened
     with the <TT
CLASS="LITERAL"
>SCROLL</TT
> option.
    </P
><P
>     Examples:
</P><PRE
CLASS="PROGRAMLISTING"
>MOVE curs1;
MOVE LAST FROM curs3;
MOVE RELATIVE -2 FROM curs4;
MOVE FORWARD 2 FROM curs4;</PRE
><P>
       </P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN57568"
>39.7.3.3. <TT
CLASS="LITERAL"
>UPDATE/DELETE WHERE CURRENT OF</TT
></A
></H3
><PRE
CLASS="SYNOPSIS"
>UPDATE <TT
CLASS="REPLACEABLE"
><I
>table</I
></TT
> SET ... WHERE CURRENT OF <TT
CLASS="REPLACEABLE"
><I
>cursor</I
></TT
>;
DELETE FROM <TT
CLASS="REPLACEABLE"
><I
>table</I
></TT
> WHERE CURRENT OF <TT
CLASS="REPLACEABLE"
><I
>cursor</I
></TT
>;</PRE
><P
>        When a cursor is positioned on a table row, that row can be updated
        or deleted using the cursor to identify the row.  There are
        restrictions on what the cursor's query can be (in particular,
        no grouping) and it's best to use <TT
CLASS="LITERAL"
>FOR UPDATE</TT
> in the
        cursor.  For more information see the
        <A
HREF="sql-declare.html"
>DECLARE</A
>
        reference page.
       </P
><P
>        An example:
</P><PRE
CLASS="PROGRAMLISTING"
>UPDATE foo SET dataval = myval WHERE CURRENT OF curs1;</PRE
><P>
       </P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN57581"
>39.7.3.4. <TT
CLASS="LITERAL"
>CLOSE</TT
></A
></H3
><PRE
CLASS="SYNOPSIS"
>CLOSE <TT
CLASS="REPLACEABLE"
><I
>cursor</I
></TT
>;</PRE
><P
>        <TT
CLASS="COMMAND"
>CLOSE</TT
> closes the portal underlying an open
        cursor.  This can be used to release resources earlier than end of
        transaction, or to free up the cursor variable to be opened again.
       </P
><P
>        An example:
</P><PRE
CLASS="PROGRAMLISTING"
>CLOSE curs1;</PRE
><P>
       </P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN57590"
>39.7.3.5. Returning Cursors</A
></H3
><P
>        <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> functions can return cursors to the
        caller. This is useful to return multiple rows or columns,
        especially with very large result sets.  To do this, the function
        opens the cursor and returns the cursor name to the caller (or simply
        opens the cursor using a portal name specified by or otherwise known
        to the caller).  The caller can then fetch rows from the cursor. The
        cursor can be closed by the caller, or it will be closed automatically
        when the transaction closes.
       </P
><P
>        The portal name used for a cursor can be specified by the
        programmer or automatically generated.  To specify a portal name,
        simply assign a string to the <TT
CLASS="TYPE"
>refcursor</TT
> variable before
        opening it.  The string value of the <TT
CLASS="TYPE"
>refcursor</TT
> variable
        will be used by <TT
CLASS="COMMAND"
>OPEN</TT
> as the name of the underlying portal.
        However, if the <TT
CLASS="TYPE"
>refcursor</TT
> variable is null,
        <TT
CLASS="COMMAND"
>OPEN</TT
> automatically generates a name that does not
        conflict with any existing portal, and assigns it to the
        <TT
CLASS="TYPE"
>refcursor</TT
> variable.
       </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>         A bound cursor variable is initialized to the string value
         representing its name, so that the portal name is the same as
         the cursor variable name, unless the programmer overrides it
         by assignment before opening the cursor.  But an unbound cursor
         variable defaults to the null value initially, so it will receive
         an automatically-generated unique name, unless overridden.
        </P
></BLOCKQUOTE
></DIV
><P
>        The following example shows one way a cursor name can be supplied by
        the caller:

</P><PRE
CLASS="PROGRAMLISTING"
>CREATE TABLE test (col text);
INSERT INTO test VALUES ('123');

CREATE FUNCTION reffunc(refcursor) RETURNS refcursor AS '
BEGIN
    OPEN $1 FOR SELECT col FROM test;
    RETURN $1;
END;
' LANGUAGE plpgsql;

BEGIN;
SELECT reffunc('funccursor');
FETCH ALL IN funccursor;
COMMIT;</PRE
><P>
       </P
><P
>        The following example uses automatic cursor name generation:

</P><PRE
CLASS="PROGRAMLISTING"
>CREATE FUNCTION reffunc2() RETURNS refcursor AS '
DECLARE
    ref refcursor;
BEGIN
    OPEN ref FOR SELECT col FROM test;
    RETURN ref;
END;
' LANGUAGE plpgsql;

-- need to be in a transaction to use cursors.
BEGIN;
SELECT reffunc2();

reffunc2
--------------------
 &lt;unnamed cursor 1&gt;
(1 row)

FETCH ALL IN "&lt;unnamed cursor 1&gt;";
COMMIT;</PRE
><P>
       </P
><P
>        The following example shows one way to return multiple cursors
        from a single function:

</P><PRE
CLASS="PROGRAMLISTING"
>CREATE FUNCTION myfunc(refcursor, refcursor) RETURNS SETOF refcursor AS $$
BEGIN
    OPEN $1 FOR SELECT * FROM table_1;
    RETURN NEXT $1;
    OPEN $2 FOR SELECT * FROM table_2;
    RETURN NEXT $2;
END;
$$ LANGUAGE plpgsql;

-- need to be in a transaction to use cursors.
BEGIN;

SELECT * FROM myfunc('a', 'b');

FETCH ALL FROM a;
FETCH ALL FROM b;
COMMIT;</PRE
><P>
       </P
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="PLPGSQL-CURSOR-FOR-LOOP"
>39.7.4. Looping Through a Cursor's Result</A
></H2
><P
>     There is a variant of the <TT
CLASS="COMMAND"
>FOR</TT
> statement that allows
     iterating through the rows returned by a cursor.  The syntax is:

</P><PRE
CLASS="SYNOPSIS"
>[<SPAN
CLASS="OPTIONAL"
> &lt;&lt;<TT
CLASS="REPLACEABLE"
><I
>label</I
></TT
>&gt;&gt; </SPAN
>]
FOR <TT
CLASS="REPLACEABLE"
><I
>recordvar</I
></TT
> IN <TT
CLASS="REPLACEABLE"
><I
>bound_cursorvar</I
></TT
> [<SPAN
CLASS="OPTIONAL"
> ( [<SPAN
CLASS="OPTIONAL"
> <TT
CLASS="REPLACEABLE"
><I
>argument_name</I
></TT
> := </SPAN
>] <TT
CLASS="REPLACEABLE"
><I
>argument_value</I
></TT
> [<SPAN
CLASS="OPTIONAL"
>, ...</SPAN
>] ) </SPAN
>] LOOP
    <TT
CLASS="REPLACEABLE"
><I
>statements</I
></TT
>
END LOOP [<SPAN
CLASS="OPTIONAL"
> <TT
CLASS="REPLACEABLE"
><I
>label</I
></TT
> </SPAN
>];</PRE
><P>

The cursor variable must have been bound to some query when it was
     declared, and it <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>cannot</I
></SPAN
> be open already.  The
     <TT
CLASS="COMMAND"
>FOR</TT
> statement automatically opens the cursor, and it closes
     the cursor again when the loop exits.  A list of actual argument value
     expressions must appear if and only if the cursor was declared to take
     arguments.  These values will be substituted in the query, in just
     the same way as during an <TT
CLASS="COMMAND"
>OPEN</TT
> (see <A
HREF="plpgsql-cursors.html#PLPGSQL-OPEN-BOUND-CURSOR"
>Section 39.7.2.3</A
>).
   </P
><P
>     The variable <TT
CLASS="REPLACEABLE"
><I
>recordvar</I
></TT
> is automatically
     defined as type <TT
CLASS="TYPE"
>record</TT
> and exists only inside the loop (any
     existing definition of the variable name is ignored within the loop).
     Each row returned by the cursor is successively assigned to this
     record variable and the loop body is executed.
    </P
></DIV
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