database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-31 10:30:33 +03:00
Code Activity

Implement CASE expression.

Browse Source
This commit is contained in:
Thomas G. Lockhart
1998-12-04 15:34:49 +00:00
parent 19740e2fff
commit bedd04a551
17 changed files with 779 additions and 110 deletions
Download Patch File Download Diff File Expand all files Collapse all files

87
src/backend/nodes/outfuncs.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.48 1998/11/22 10:48:39 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.49 1998/12/04 15:33:33 thomas Exp $
*
* NOTES
* Every (plan) node in POSTGRES has an associated "out" routine which
@@ -1635,6 +1635,82 @@ _outAConst(StringInfo str, A_Const *node)
return;
}
static void
_outConstraint(StringInfo str, Constraint *node)
{
char buf[500];
sprintf(buf," %s :type",
((node->name != NULL)? node->name: "<>"));
appendStringInfo(str, buf);
switch (node->contype)
{
case CONSTR_PRIMARY:
sprintf(buf," PRIMARY KEY ");
appendStringInfo(str, buf);
_outNode(str, node->keys);
break;
case CONSTR_CHECK:
sprintf(buf," CHECK ");
appendStringInfo(str, buf);
appendStringInfo(str, node->def);
break;
case CONSTR_DEFAULT:
sprintf(buf," DEFAULT ");
appendStringInfo(str, buf);
appendStringInfo(str, node->def);
break;
case CONSTR_NOTNULL:
sprintf(buf," NOT NULL ");
appendStringInfo(str, buf);
break;
case CONSTR_UNIQUE:
sprintf(buf," UNIQUE ");
appendStringInfo(str, buf);
_outNode(str, node->keys);
break;
default:
sprintf(buf,"<unrecognized constraint>");
appendStringInfo(str, buf);
break;
}
return;
}
static void
_outCaseExpr(StringInfo str, CaseExpr *node)
{
char buf[500];
sprintf(buf, "CASE ");
appendStringInfo(str, buf);
_outNode(str, node->args);
sprintf(buf, " :default ");
appendStringInfo(str, buf);
_outNode(str, node->defresult);
return;
}
static void
_outCaseWhen(StringInfo str, CaseWhen *node)
{
char buf[500];
sprintf(buf, " :when ");
appendStringInfo(str, buf);
_outNode(str, node->expr);
sprintf(buf, " :then ");
appendStringInfo(str, buf);
_outNode(str, node->result);
return;
}
/*
* _outNode -
* converts a Node into ascii string and append it to 'str'
@@ -1861,6 +1937,15 @@ _outNode(StringInfo str, void *obj)
case T_A_Const:
_outAConst(str, obj);
break;
case T_Constraint:
_outConstraint(str, obj);
break;
case T_CaseExpr:
_outCaseExpr(str, obj);
break;
case T_CaseWhen:
_outCaseWhen(str, obj);
break;
default:
elog(NOTICE, "_outNode: don't know how to print type %d ",
nodeTag(obj));