diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/commands/typecmds.c | 67 |
1 files changed, 40 insertions, 27 deletions
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c index 8cc58a9f588..dd5b52bc97a 100644 --- a/src/backend/commands/typecmds.c +++ b/src/backend/commands/typecmds.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.82.2.1 2005/11/22 18:23:08 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.82.2.2 2007/06/20 18:16:04 tgl Exp $ * * DESCRIPTION * The "DefineFoo" routines take the parse tree and pick out the @@ -493,9 +493,9 @@ DefineDomain(CreateDomainStmt *stmt) char typtype; Datum datum; bool isnull; - Node *defaultExpr = NULL; char *defaultValue = NULL; char *defaultValueBin = NULL; + bool saw_default = false; bool typNotNull = false; bool nullDefined = false; Oid basetypelem; @@ -602,7 +602,6 @@ DefineDomain(CreateDomainStmt *stmt) { Node *newConstraint = lfirst(listptr); Constraint *constr; - ParseState *pstate; /* Check for unsupported constraint types */ if (IsA(newConstraint, FkConstraint)) @@ -623,35 +622,49 @@ DefineDomain(CreateDomainStmt *stmt) /* * The inherited default value may be overridden by the user - * with the DEFAULT <expr> statement. + * with the DEFAULT <expr> clause ... but only once. */ - if (defaultExpr) + if (saw_default) ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("multiple default expressions"))); + saw_default = true; - /* Create a dummy ParseState for transformExpr */ - pstate = make_parsestate(NULL); - - /* - * Cook the constr->raw_expr into an expression. Note: Name is - * strictly for error message - */ - defaultExpr = cookDefault(pstate, constr->raw_expr, - basetypeoid, - stmt->typename->typmod, - domainName); - - /* - * Expression must be stored as a nodeToString result, but we - * also require a valid textual representation (mainly to make - * life easier for pg_dump). - */ - defaultValue = deparse_expression(defaultExpr, - deparse_context_for(domainName, - InvalidOid), - false, false); - defaultValueBin = nodeToString(defaultExpr); + if (constr->raw_expr) + { + ParseState *pstate; + Node *defaultExpr; + + /* Create a dummy ParseState for transformExpr */ + pstate = make_parsestate(NULL); + + /* + * Cook the constr->raw_expr into an expression. + * Note: name is strictly for error message + */ + defaultExpr = cookDefault(pstate, constr->raw_expr, + basetypeoid, + stmt->typename->typmod, + domainName); + + /* + * Expression must be stored as a nodeToString result, but + * we also require a valid textual representation (mainly + * to make life easier for pg_dump). + */ + defaultValue = + deparse_expression(defaultExpr, + deparse_context_for(domainName, + InvalidOid), + false, false); + defaultValueBin = nodeToString(defaultExpr); + } + else + { + /* DEFAULT NULL is same as not having a default */ + defaultValue = NULL; + defaultValueBin = NULL; + } break; case CONSTR_NOTNULL: |