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(* Copyright (c) 2008-2009, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
structure Postgres :> POSTGRES = struct
open Settings
open Print.PD
open Print
fun init (dbstring, ss) =
box [if #persistent (currentProtocol ()) then
box [string "static void uw_db_prepare(uw_context ctx) {",
newline,
string "PGconn *conn = uw_get_db(ctx);",
newline,
string "PGresult *res;",
newline,
newline,
p_list_sepi newline (fn i => fn (s, n) =>
box [string "res = PQprepare(conn, \"uw",
string (Int.toString i),
string "\", \"",
string (String.toString s),
string "\", ",
string (Int.toString n),
string ", NULL);",
newline,
string "if (PQresultStatus(res) != PGRES_COMMAND_OK) {",
newline,
box [string "char msg[1024];",
newline,
string "strncpy(msg, PQerrorMessage(conn), 1024);",
newline,
string "msg[1023] = 0;",
newline,
string "PQclear(res);",
newline,
string "PQfinish(conn);",
newline,
string "uw_error(ctx, FATAL, \"Unable to create prepared statement:\\n",
string (String.toString s),
string "\\n%s\", msg);",
newline],
string "}",
newline,
string "PQclear(res);",
newline])
ss,
string "}",
newline,
newline,
string "void uw_db_close(uw_context ctx) {",
newline,
string "PQfinish(uw_get_db(ctx));",
newline,
string "}",
newline,
newline,
string "int uw_db_begin(uw_context ctx) {",
newline,
string "PGconn *conn = uw_get_db(ctx);",
newline,
string "PGresult *res = PQexec(conn, \"BEGIN ISOLATION LEVEL SERIALIZABLE\");",
newline,
newline,
string "if (res == NULL) return 1;",
newline,
newline,
string "if (PQresultStatus(res) != PGRES_COMMAND_OK) {",
box [string "PQclear(res);",
newline,
string "return 1;",
newline],
string "}",
newline,
string "return 0;",
newline,
string "}",
newline,
newline,
string "int uw_db_commit(uw_context ctx) {",
newline,
string "PGconn *conn = uw_get_db(ctx);",
newline,
string "PGresult *res = PQexec(conn, \"COMMIT\");",
newline,
newline,
string "if (res == NULL) return 1;",
newline,
newline,
string "if (PQresultStatus(res) != PGRES_COMMAND_OK) {",
box [string "PQclear(res);",
newline,
string "return 1;",
newline],
string "}",
newline,
string "return 0;",
newline,
string "}",
newline,
newline,
string "int uw_db_rollback(uw_context ctx) {",
newline,
string "PGconn *conn = uw_get_db(ctx);",
newline,
string "PGresult *res = PQexec(conn, \"ROLLBACK\");",
newline,
newline,
string "if (res == NULL) return 1;",
newline,
newline,
string "if (PQresultStatus(res) != PGRES_COMMAND_OK) {",
box [string "PQclear(res);",
newline,
string "return 1;",
newline],
string "}",
newline,
string "return 0;",
newline,
string "}",
newline,
newline]
else
string "static void uw_db_prepare(uw_context ctx) { }",
newline,
newline,
string "void uw_db_init(uw_context ctx) {",
newline,
string "PGconn *conn = PQconnectdb(\"",
string (String.toString dbstring),
string "\");",
newline,
string "if (conn == NULL) uw_error(ctx, FATAL, ",
string "\"libpq can't allocate a connection.\");",
newline,
string "if (PQstatus(conn) != CONNECTION_OK) {",
newline,
box [string "char msg[1024];",
newline,
string "strncpy(msg, PQerrorMessage(conn), 1024);",
newline,
string "msg[1023] = 0;",
newline,
string "PQfinish(conn);",
newline,
string "uw_error(ctx, BOUNDED_RETRY, ",
string "\"Connection to Postgres server failed: %s\", msg);"],
newline,
string "}",
newline,
string "uw_set_db(ctx, conn);",
newline,
string "uw_db_validate(ctx);",
newline,
string "uw_db_prepare(ctx);",
newline,
string "}"]
fun p_getcol {wontLeakStrings, col = i, typ = t} =
let
fun p_unsql t e eLen =
case t of
Int => box [string "uw_Basis_stringToInt_error(ctx, ", e, string ")"]
| Float => box [string "uw_Basis_stringToFloat_error(ctx, ", e, string ")"]
| String =>
if wontLeakStrings then
e
else
box [string "uw_strdup(ctx, ", e, string ")"]
| Bool => box [string "uw_Basis_stringToBool_error(ctx, ", e, string ")"]
| Time => box [string "uw_Basis_stringToTime_error(ctx, ", e, string ")"]
| Blob => box [string "uw_Basis_stringToBlob_error(ctx, ",
e,
string ", ",
eLen,
string ")"]
| Channel => box [string "uw_Basis_stringToChannel_error(ctx, ", e, string ")"]
| Client => box [string "uw_Basis_stringToClient_error(ctx, ", e, string ")"]
| Nullable _ => raise Fail "Postgres: Recursive Nullable"
fun getter t =
case t of
Nullable t =>
box [string "(PQgetisnull(res, i, ",
string (Int.toString i),
string ") ? NULL : ",
case t of
String => getter t
| _ => box [string "({",
newline,
p_sql_type t,
space,
string "*tmp = uw_malloc(ctx, sizeof(",
p_sql_type t,
string "));",
newline,
string "*tmp = ",
getter t,
string ";",
newline,
string "tmp;",
newline,
string "})"],
string ")"]
| _ =>
box [string "(PQgetisnull(res, i, ",
string (Int.toString i),
string ") ? ",
box [string "({",
p_sql_type t,
space,
string "tmp;",
newline,
string "uw_error(ctx, FATAL, \"Unexpectedly NULL field #",
string (Int.toString i),
string "\");",
newline,
string "tmp;",
newline,
string "})"],
string " : ",
p_unsql t
(box [string "PQgetvalue(res, i, ",
string (Int.toString i),
string ")"])
(box [string "PQgetlength(res, i, ",
string (Int.toString i),
string ")"]),
string ")"]
in
getter t
end
fun queryCommon {loc, query, numCols, doCols} =
box [string "int n, i;",
newline,
newline,
string "if (res == NULL) uw_error(ctx, FATAL, \"Out of memory allocating query result.\");",
newline,
newline,
string "if (PQresultStatus(res) != PGRES_TUPLES_OK) {",
newline,
box [string "PQclear(res);",
newline,
string "uw_error(ctx, FATAL, \"",
string (ErrorMsg.spanToString loc),
string ": Query failed:\\n%s\\n%s\", ",
query,
string ", PQerrorMessage(conn));",
newline],
string "}",
newline,
newline,
string "if (PQnfields(res) != ",
string (Int.toString numCols),
string ") {",
newline,
box [string "int nf = PQnfields(res);",
newline,
string "PQclear(res);",
newline,
string "uw_error(ctx, FATAL, \"",
string (ErrorMsg.spanToString loc),
string ": Query returned %d columns instead of ",
string (Int.toString numCols),
string ":\\n%s\\n%s\", nf, ",
query,
string ", PQerrorMessage(conn));",
newline],
string "}",
newline,
newline,
string "uw_end_region(ctx);",
newline,
string "uw_push_cleanup(ctx, (void (*)(void *))PQclear, res);",
newline,
string "n = PQntuples(res);",
newline,
string "for (i = 0; i < n; ++i) {",
newline,
doCols p_getcol,
string "}",
newline,
newline,
string "uw_pop_cleanup(ctx);",
newline]
fun query {loc, numCols, doCols} =
box [string "PGconn *conn = uw_get_db(ctx);",
newline,
string "PGresult *res = PQexecParams(conn, query, 0, NULL, NULL, NULL, NULL, 0);",
newline,
newline,
queryCommon {loc = loc, numCols = numCols, doCols = doCols, query = string "query"}]
fun p_ensql t e =
case t of
Int => box [string "uw_Basis_attrifyInt(ctx, ", e, string ")"]
| Float => box [string "uw_Basis_attrifyFloat(ctx, ", e, string ")"]
| String => e
| Bool => box [string "(", e, string " ? \"TRUE\" : \"FALSE\")"]
| Time => box [string "uw_Basis_attrifyTime(ctx, ", e, string ")"]
| Blob => box [e, string ".data"]
| Channel => box [string "uw_Basis_attrifyChannel(ctx, ", e, string ")"]
| Client => box [string "uw_Basis_attrifyClient(ctx, ", e, string ")"]
| Nullable String => e
| Nullable t => box [string "(",
e,
string " == NULL ? NULL : ",
p_ensql t (box [string "(*", e, string ")"]),
string ")"]
fun queryPrepared {loc, id, query, inputs, numCols, doCols} =
box [string "PGconn *conn = uw_get_db(ctx);",
newline,
string "const int paramFormats[] = { ",
p_list_sep (box [string ",", space])
(fn t => if isBlob t then string "1" else string "0") inputs,
string " };",
newline,
string "const int paramLengths[] = { ",
p_list_sepi (box [string ",", space])
(fn i => fn Blob => string ("arg" ^ Int.toString (i + 1) ^ ".size")
| Nullable Blob => string ("arg" ^ Int.toString (i + 1)
^ "?arg" ^ Int.toString (i + 1) ^ "->size:0")
| _ => string "0") inputs,
string " };",
newline,
string "const char *paramValues[] = { ",
p_list_sepi (box [string ",", space])
(fn i => fn t => p_ensql t (box [string "arg",
string (Int.toString (i + 1))]))
inputs,
string " };",
newline,
newline,
string "PGresult *res = ",
if #persistent (Settings.currentProtocol ()) then
box [string "PQexecPrepared(conn, \"uw",
string (Int.toString id),
string "\", ",
string (Int.toString (length inputs)),
string ", paramValues, paramLengths, paramFormats, 0);"]
else
box [string "PQexecParams(conn, \"",
string (String.toString query),
string "\", ",
string (Int.toString (length inputs)),
string ", NULL, paramValues, paramLengths, paramFormats, 0);"],
newline,
newline,
queryCommon {loc = loc, numCols = numCols, doCols = doCols, query = box [string "\"",
string (String.toString query),
string "\""]}]
val () = addDbms {name = "postgres",
header = "postgresql/libpq-fe.h",
link = "-lpq",
global_init = box [string "void uw_client_init() { }",
newline],
init = init,
query = query,
queryPrepared = queryPrepared}
val () = setDbms "postgres"
end
|
