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Extended query protocol: parse, bind, execute, describe FE/BE messages.

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Only lightly tested as yet, since libpq doesn't know anything about 'em.
This commit is contained in:
Tom Lane
2003-05-05 00:44:56 +00:00
parent a59793f82c
commit 16503e6fa4
17 changed files with 1336 additions and 268 deletions
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63
src/backend/parser/analyze.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.269 2003/05/02 20:54:34 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.270 2003/05/05 00:44:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -83,6 +83,12 @@ typedef struct
IndexStmt *pkey; /* PRIMARY KEY index, if any */
} CreateStmtContext;
typedef struct
{
Oid *paramTypes;
int numParams;
} check_parameter_resolution_context;
static List *do_parse_analyze(Node *parseTree, ParseState *pstate);
static Query *transformStmt(ParseState *pstate, Node *stmt,
@ -124,6 +130,8 @@ static void transformColumnType(ParseState *pstate, ColumnDef *column);
static bool relationHasPrimaryKey(Oid relationOid);
static void release_pstate_resources(ParseState *pstate);
static FromExpr *makeFromExpr(List *fromlist, Node *quals);
static bool check_parameter_resolution_walker(Node *node,
check_parameter_resolution_context *context);
/*
@ -179,6 +187,16 @@ parse_analyze_varparams(Node *parseTree, Oid **paramTypes, int *numParams)
pfree(pstate);
/* make sure all is well with parameter types */
if (*numParams > 0)
{
check_parameter_resolution_context context;
context.paramTypes = *paramTypes;
context.numParams = *numParams;
check_parameter_resolution_walker((Node *) result, &context);
}
return result;
}
@ -2465,7 +2483,7 @@ transformExecuteStmt(ParseState *pstate, ExecuteStmt *stmt)
result->commandType = CMD_UTILITY;
result->utilityStmt = (Node *) stmt;
paramtypes = FetchQueryParams(stmt->name);
paramtypes = FetchPreparedStatementParams(stmt->name);
if (stmt->params || paramtypes)
{
@ -2879,3 +2897,44 @@ analyzeCreateSchemaStmt(CreateSchemaStmt *stmt)
return result;
}
/*
* Traverse a fully-analyzed tree to verify that parameter symbols
* match their types. We need this because some Params might still
* be UNKNOWN, if there wasn't anything to force their coercion,
* and yet other instances seen later might have gotten coerced.
*/
static bool
check_parameter_resolution_walker(Node *node,
check_parameter_resolution_context *context)
{
if (node == NULL)
return false;
if (IsA(node, Param))
{
Param *param = (Param *) node;
if (param->paramkind == PARAM_NUM)
{
int paramno = param->paramid;
if (paramno <= 0 || /* shouldn't happen, but... */
paramno > context->numParams)
elog(ERROR, "Parameter '$%d' is out of range", paramno);
if (param->paramtype != context->paramTypes[paramno-1])
elog(ERROR, "Could not determine datatype of parameter $%d",
paramno);
}
return false;
}
if (IsA(node, Query))
{
/* Recurse into RTE subquery or not-yet-planned sublink subquery */
return query_tree_walker((Query *) node,
check_parameter_resolution_walker,
(void *) context, 0);
}
return expression_tree_walker(node, check_parameter_resolution_walker,
(void *) context);
}