diff options
Diffstat (limited to 'contrib/tablefunc/tablefunc.c')
| -rw-r--r-- | contrib/tablefunc/tablefunc.c | 212 |
1 files changed, 183 insertions, 29 deletions
diff --git a/contrib/tablefunc/tablefunc.c b/contrib/tablefunc/tablefunc.c index be99d855bf5..d883793aace 100644 --- a/contrib/tablefunc/tablefunc.c +++ b/contrib/tablefunc/tablefunc.c @@ -4,6 +4,8 @@ * Sample to demonstrate C functions which return setof scalar * and setof composite. * Joe Conway <mail@joeconway.com> + * And contributors: + * Nabil Sayegh <postgresql@e-trolley.de> * * Copyright 2002 by PostgreSQL Global Development Group * @@ -45,7 +47,7 @@ static Tuplestorestate *get_crosstab_tuplestore(char *sql, int num_categories, TupleDesc tupdesc, MemoryContext per_query_ctx); -static void validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch); +static void validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch, bool show_serial); static bool compatCrosstabTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2); static bool compatConnectbyTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2); static void get_normal_pair(float8 *x1, float8 *x2); @@ -54,21 +56,26 @@ static TupleDesc make_crosstab_tupledesc(TupleDesc spi_tupdesc, static Tuplestorestate *connectby(char *relname, char *key_fld, char *parent_key_fld, + char *orderby_fld, char *branch_delim, char *start_with, int max_depth, bool show_branch, + bool show_serial, MemoryContext per_query_ctx, AttInMetadata *attinmeta); static Tuplestorestate *build_tuplestore_recursively(char *key_fld, char *parent_key_fld, char *relname, + char *orderby_fld, char *branch_delim, char *start_with, char *branch, int level, + int *serial, int max_depth, bool show_branch, + bool show_serial, MemoryContext per_query_ctx, AttInMetadata *attinmeta, Tuplestorestate *tupstore); @@ -1017,31 +1024,32 @@ get_crosstab_tuplestore(char *sql, * * e.g. given table foo: * - * keyid parent_keyid - * ------+-------------- - * row1 NULL - * row2 row1 - * row3 row1 - * row4 row2 - * row5 row2 - * row6 row4 - * row7 row3 - * row8 row6 - * row9 row5 + * keyid parent_keyid pos + * ------+------------+-- + * row1 NULL 0 + * row2 row1 0 + * row3 row1 0 + * row4 row2 1 + * row5 row2 0 + * row6 row4 0 + * row7 row3 0 + * row8 row6 0 + * row9 row5 0 * * - * connectby(text relname, text keyid_fld, text parent_keyid_fld, - * text start_with, int max_depth [, text branch_delim]) - * connectby('foo', 'keyid', 'parent_keyid', 'row2', 0, '~') returns: + * connectby(text relname, text keyid_fld, text parent_keyid_fld + * [, text orderby_fld], text start_with, int max_depth + * [, text branch_delim]) + * connectby('foo', 'keyid', 'parent_keyid', 'pos', 'row2', 0, '~') returns: * - * keyid parent_id level branch + * keyid parent_id level branch serial * ------+-----------+--------+----------------------- - * row2 NULL 0 row2 - * row4 row2 1 row2~row4 - * row6 row4 2 row2~row4~row6 - * row8 row6 3 row2~row4~row6~row8 - * row5 row2 1 row2~row5 - * row9 row5 2 row2~row5~row9 + * row2 NULL 0 row2 1 + * row5 row2 1 row2~row5 2 + * row9 row5 2 row2~row5~row9 3 + * row4 row2 1 row2~row4 4 + * row6 row4 2 row2~row4~row6 5 + * row8 row6 3 row2~row4~row6~row8 6 * */ PG_FUNCTION_INFO_V1(connectby_text); @@ -1059,6 +1067,7 @@ connectby_text(PG_FUNCTION_ARGS) int max_depth = PG_GETARG_INT32(4); char *branch_delim = NULL; bool show_branch = false; + bool show_serial = false; ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; TupleDesc tupdesc; AttInMetadata *attinmeta; @@ -1088,7 +1097,7 @@ connectby_text(PG_FUNCTION_ARGS) tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc); /* does it meet our needs */ - validateConnectbyTupleDesc(tupdesc, show_branch); + validateConnectbyTupleDesc(tupdesc, show_branch, show_serial); /* OK, use it then */ attinmeta = TupleDescGetAttInMetadata(tupdesc); @@ -1105,10 +1114,12 @@ connectby_text(PG_FUNCTION_ARGS) rsinfo->setResult = connectby(relname, key_fld, parent_key_fld, + NULL, branch_delim, start_with, max_depth, show_branch, + show_serial, per_query_ctx, attinmeta); rsinfo->setDesc = tupdesc; @@ -1125,6 +1136,85 @@ connectby_text(PG_FUNCTION_ARGS) return (Datum) 0; } +PG_FUNCTION_INFO_V1(connectby_text_serial); +Datum +connectby_text_serial(PG_FUNCTION_ARGS) +{ + char *relname = GET_STR(PG_GETARG_TEXT_P(0)); + char *key_fld = GET_STR(PG_GETARG_TEXT_P(1)); + char *parent_key_fld = GET_STR(PG_GETARG_TEXT_P(2)); + char *orderby_fld = GET_STR(PG_GETARG_TEXT_P(3)); + char *start_with = GET_STR(PG_GETARG_TEXT_P(4)); + int max_depth = PG_GETARG_INT32(5); + char *branch_delim = NULL; + bool show_branch = false; + bool show_serial = true; + + ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; + TupleDesc tupdesc; + AttInMetadata *attinmeta; + MemoryContext per_query_ctx; + MemoryContext oldcontext; + + /* check to see if caller supports us returning a tuplestore */ + if (!rsinfo || !(rsinfo->allowedModes & SFRM_Materialize)) + elog(ERROR, "connectby: materialize mode required, but it is not " + "allowed in this context"); + + if (fcinfo->nargs == 7) + { + branch_delim = GET_STR(PG_GETARG_TEXT_P(6)); + show_branch = true; + } + else + /* default is no show, tilde for the delimiter */ + branch_delim = pstrdup("~"); + + per_query_ctx = rsinfo->econtext->ecxt_per_query_memory; + oldcontext = MemoryContextSwitchTo(per_query_ctx); + + /* get the requested return tuple description */ + tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc); + + /* does it meet our needs */ + validateConnectbyTupleDesc(tupdesc, show_branch, show_serial); + + /* OK, use it then */ + attinmeta = TupleDescGetAttInMetadata(tupdesc); + + /* check to see if caller supports us returning a tuplestore */ + if (!rsinfo->allowedModes & SFRM_Materialize) + elog(ERROR, "connectby requires Materialize mode, but it is not " + "allowed in this context"); + + /* OK, go to work */ + rsinfo->returnMode = SFRM_Materialize; + rsinfo->setResult = connectby(relname, + key_fld, + parent_key_fld, + orderby_fld, + branch_delim, + start_with, + max_depth, + show_branch, + show_serial, + per_query_ctx, + attinmeta); + rsinfo->setDesc = tupdesc; + + MemoryContextSwitchTo(oldcontext); + + /* + * SFRM_Materialize mode expects us to return a NULL Datum. The actual + * tuples are in our tuplestore and passed back through + * rsinfo->setResult. rsinfo->setDesc is set to the tuple description + * that we actually used to build our tuples with, so the caller can + * verify we did what it was expecting. + */ + return (Datum) 0; +} + + /* * connectby - does the real work for connectby_text() */ @@ -1132,10 +1222,12 @@ static Tuplestorestate * connectby(char *relname, char *key_fld, char *parent_key_fld, + char *orderby_fld, char *branch_delim, char *start_with, int max_depth, bool show_branch, + bool show_serial, MemoryContext per_query_ctx, AttInMetadata *attinmeta) { @@ -1143,6 +1235,8 @@ connectby(char *relname, int ret; MemoryContext oldcontext; + int serial = 1; + /* Connect to SPI manager */ if ((ret = SPI_connect()) < 0) /* internal error */ @@ -1160,12 +1254,15 @@ connectby(char *relname, tupstore = build_tuplestore_recursively(key_fld, parent_key_fld, relname, + orderby_fld, branch_delim, start_with, start_with, /* current_branch */ 0, /* initial level is 0 */ + &serial, /* initial serial is 1 */ max_depth, show_branch, + show_serial, per_query_ctx, attinmeta, tupstore); @@ -1179,12 +1276,15 @@ static Tuplestorestate * build_tuplestore_recursively(char *key_fld, char *parent_key_fld, char *relname, + char *orderby_fld, char *branch_delim, char *start_with, char *branch, int level, + int *serial, int max_depth, bool show_branch, + bool show_serial, MemoryContext per_query_ctx, AttInMetadata *attinmeta, Tuplestorestate *tupstore) @@ -1194,18 +1294,35 @@ build_tuplestore_recursively(char *key_fld, StringInfo sql = makeStringInfo(); int ret; int proc; + int serial_column; if (max_depth > 0 && level > max_depth) return tupstore; /* Build initial sql statement */ - appendStringInfo(sql, "SELECT %s, %s FROM %s WHERE %s = '%s' AND %s IS NOT NULL", + if (!show_serial) + { + appendStringInfo(sql, "SELECT %s, %s FROM %s WHERE %s = '%s' AND %s IS NOT NULL", key_fld, parent_key_fld, relname, parent_key_fld, start_with, key_fld); + serial_column=0; + } + else + { + appendStringInfo(sql, "SELECT %s, %s FROM %s WHERE %s = '%s' AND %s IS NOT NULL ORDER BY %s", + key_fld, + parent_key_fld, + relname, + parent_key_fld, + start_with, + key_fld, + orderby_fld); + serial_column=1; + } /* Retrieve the desired rows */ ret = SPI_exec(sql->data, 0); @@ -1222,6 +1339,7 @@ build_tuplestore_recursively(char *key_fld, char *current_key; char *current_key_parent; char current_level[INT32_STRLEN]; + char serial_str[INT32_STRLEN]; char *current_branch; char **values; StringInfo branchstr = NULL; @@ -1236,9 +1354,9 @@ build_tuplestore_recursively(char *key_fld, chk_current_key = makeStringInfo(); if (show_branch) - values = (char **) palloc(CONNECTBY_NCOLS * sizeof(char *)); + values = (char **) palloc((CONNECTBY_NCOLS + serial_column) * sizeof(char *)); else - values = (char **) palloc(CONNECTBY_NCOLS_NOBRANCH * sizeof(char *)); + values = (char **) palloc((CONNECTBY_NCOLS_NOBRANCH + serial_column) * sizeof(char *)); /* First time through, do a little setup */ if (level == 0) @@ -1270,6 +1388,16 @@ build_tuplestore_recursively(char *key_fld, if (show_branch) values[3] = start_with; + /* root starts the serial with 1 */ + if (show_serial) + { + sprintf(serial_str, "%d", (*serial)++); + if (show_branch) + values[4] = serial_str; + else + values[3] = serial_str; + } + /* construct the tuple */ tuple = BuildTupleFromCStrings(attinmeta, values); @@ -1317,6 +1445,14 @@ build_tuplestore_recursively(char *key_fld, values[2] = current_level; if (show_branch) values[3] = current_branch; + if (show_serial) + { + sprintf(serial_str, "%d", (*serial)++); + if (show_branch) + values[4] = serial_str; + else + values[3] = serial_str; + } tuple = BuildTupleFromCStrings(attinmeta, values); @@ -1338,12 +1474,15 @@ build_tuplestore_recursively(char *key_fld, tupstore = build_tuplestore_recursively(key_fld, parent_key_fld, relname, + orderby_fld, branch_delim, values[0], current_branch, level + 1, + serial, max_depth, show_branch, + show_serial, per_query_ctx, attinmeta, tupstore); @@ -1367,12 +1506,17 @@ build_tuplestore_recursively(char *key_fld, * Check expected (query runtime) tupdesc suitable for Connectby */ static void -validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch) +validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch, bool show_serial) { + int serial_column=0; + + if (show_serial) + serial_column=1; + /* are there the correct number of columns */ if (show_branch) { - if (tupdesc->natts != CONNECTBY_NCOLS) + if (tupdesc->natts != (CONNECTBY_NCOLS + serial_column)) ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("invalid return type"), @@ -1381,7 +1525,7 @@ validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch) } else { - if (tupdesc->natts != CONNECTBY_NCOLS_NOBRANCH) + if (tupdesc->natts != CONNECTBY_NCOLS_NOBRANCH + serial_column) ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("invalid return type"), @@ -1412,6 +1556,16 @@ validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch) errdetail("Fourth column must be type %s.", format_type_be(TEXTOID)))); + /* check that the type of the fifth column is INT4 */ + if (show_branch && show_serial && tupdesc->attrs[4]->atttypid != INT4OID) + elog(ERROR, "Query-specified return tuple not valid for Connectby: " + "fifth column must be type %s", format_type_be(INT4OID)); + + /* check that the type of the fifth column is INT4 */ + if (!show_branch && show_serial && tupdesc->attrs[3]->atttypid != INT4OID) + elog(ERROR, "Query-specified return tuple not valid for Connectby: " + "fourth column must be type %s", format_type_be(INT4OID)); + /* OK, the tupdesc is valid for our purposes */ } |