Some work on indexes/write support. Bug fixes. Preliminary temp table/worktable work.

2025-10-20 18:50:44 +08:00 · 2004-01-09 21:05:56 +00:00
parent 09ec4202dd
commit d39cc57b44
9 changed files with 315 additions and 93 deletions
--- a/16
+++ b/16
@@ -1,3 +1,19 @@
+Wed Jan 9 15:22:11 EST 2004	Brian Bruns <camber@ais.org>
+
+	* include/mdbtools.h:
+	* src/libmdb/index.c:
+	* src/libmdb/write.c: modularize this a bit more to allow reuse
+	* src/libmdb/worktable.c: preliminary worktable/temp table support
+	* src/libmdb/table.c: fix reading of free page map and enable
+	* src/data/data.c: use mdb_crack_row() from write.c for cleaner row
+	handling.  Fix delflag bug.
+	* src/util/updrow.c: fix sarg handling
+	* src/util/mdb-import.c: check for valid table
+	* src/sql/mdbsql.c: 
+	* src/util/mdb-sql.c: Fix H and F flags.  Change "list tables" and 
+	"describe table" to write to worktable so client can pull results (almost)
+	like a normal query.
+
 Wed Jan 22 14:54:11 EST 2003	Brian Bruns <camber@ais.org>

 	* src/util/mdb-sql.c: typo fix
--- a/include/mdbsql.h
+++ b/include/mdbsql.h
@@ -20,6 +20,7 @@ typedef struct {
 	GList *sarg_stack;
 	/* FIX ME */
 	char *bound_values[256];
+	unsigned char *kludge_ttable_pg;
 } MdbSQL;

 typedef struct {
--- a/include/mdbtools.h
+++ b/include/mdbtools.h
@@ -444,5 +444,6 @@ extern int mdb_like_cmp(char *s, char *r);

 /* write.c */
 extern int mdb_crack_row(MdbTableDef *table, int row_start, int row_end, MdbField *fields);
+extern void mdb_add_row_to_pg(MdbTableDef *table, unsigned char *row_buffer, int new_row_size);

 #endif /* _mdbtools_h_ */
--- a/src/libmdb/data.c
+++ b/src/libmdb/data.c
@@ -221,23 +221,42 @@ int mdb_read_row(MdbTableDef *table, int row)
 		lookupflag ? "[lookup]" : "",
 		delflag ? "[delflag]" : "");
 #endif	
-	num_fields = mdb_crack_row(table, row_start, row_end, &fields);
-	if (!mdb_test_sargs(table, &fields, num_fields)) return 0;
-	for (i=0; i < num_fields; i++) {
-		//col = g_ptr_array_index (table->columns, fields[i].colnum - 1);
-		//rc = _mdb_attempt_bind(mdb, col, fields[i].is_null,
-			//row_start + col_start, col->col_size);
-	}
-	//if (!table->noskip_del && (delflag || lookupflag)) {
+
 	if (!table->noskip_del && delflag) {
 		row_end = row_start-1;
 		return 0;
 	}

+	num_fields = mdb_crack_row(table, row_start, row_end, &fields);
+	if (!mdb_test_sargs(table, &fields, num_fields)) return 0;
+	
+#if MDB_DEBUG
+	fprintf(stdout,"sarg test passed row %d \n", row);
+#endif 
+
 #if MDB_DEBUG
 	buffer_dump(mdb->pg_buf, row_start, row_end);
 #endif

+#if 1
+	/* take advantage of mdb_crack_row() to clean up binding */
+	for (i = 0; i < num_fields; i++) {
+		col = g_ptr_array_index(table->columns,fields[i].colnum);
+		if (fields[i].is_fixed) {
+			rc = _mdb_attempt_bind(mdb, col, 
+				fields[i].is_null,
+				fields[i].start, 
+				col->col_size);
+		} else {
+			rc = _mdb_attempt_bind(mdb, col, 
+				fields[i].is_null,
+				fields[i].start, 
+				fields[i].siz);
+		}
+	}
+#endif
+
+#if 0
 	/* find out all the important stuff about the row */
 	if (IS_JET4(mdb)) {
 		num_cols = mdb_pg_get_int16(mdb, row_start);
@@ -386,6 +405,7 @@ int mdb_read_row(MdbTableDef *table, int row)
 		}
 	}

+#endif
 	return 1;
 }
 static int _mdb_attempt_bind(MdbHandle *mdb, 
--- a/src/libmdb/index.c
+++ b/src/libmdb/index.c
@@ -23,6 +23,9 @@
 #include "dmalloc.h"
 #endif

+MdbIndexPage *mdb_index_read_bottom_pg(MdbHandle *mdb, MdbIndex *idx, MdbIndexChain *chain);
+MdbIndexPage *mdb_chain_add_page(MdbHandle *mdb, MdbIndexChain *chain, guint32 pg);
+
 char idx_to_text[] = {
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0-7     0x00-0x07 */
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 8-15    0x09-0x0f */
@@ -334,20 +337,19 @@ void mdb_index_page_init(MdbIndexPage *ipg)
 * pages at the end of the chain have been peeled off before the call.
 */
 MdbIndexPage *
-mdb_find_next_leaf(MdbHandle *mdb, MdbIndexChain *chain)
+mdb_find_next_leaf(MdbHandle *mdb, MdbIndex *idx, MdbIndexChain *chain)
 {
 	MdbIndexPage *ipg, *newipg;
 	guint32 pg;
 	guint passed = 0;

-	ipg = &(chain->pages[chain->cur_depth - 1]);
+	ipg = mdb_index_read_bottom_pg(mdb, idx, chain);

 	/*
 	 * If we are at the first page deep and it's not an index page then
 	 * we are simply done. (there is no page to find
 	 */

-	mdb_read_pg(mdb, ipg->pg);
 	if (mdb->pg_buf[0]==MDB_PAGE_LEAF) 
 		return ipg;

@@ -367,15 +369,8 @@ mdb_find_next_leaf(MdbHandle *mdb, MdbIndexChain *chain)
 		 * add to the chain and call this function
 		 * recursively.
 		 */
-		chain->cur_depth++;
-		if (chain->cur_depth > MDB_MAX_INDEX_DEPTH) {
-			fprintf(stderr,"Error! maximum index depth of %d exceeded.  This is probably due to a programming bug, If you are confident that your indexes really are this deep, adjust MDB_MAX_INDEX_DEPTH in mdbtools.h and recompile.\n", MDB_MAX_INDEX_DEPTH);
-			exit(1);
-		}
-		newipg = &(chain->pages[chain->cur_depth - 1]);
-		mdb_index_page_init(newipg);
-		newipg->pg = pg;
-		newipg = mdb_find_next_leaf(mdb, chain);
+		newipg = mdb_chain_add_page(mdb, chain, pg);
+		newipg = mdb_find_next_leaf(mdb, idx, chain);
 		//printf("returning pg %lu\n",newipg->pg);
 		return newipg;
 	} while (!passed);
@@ -383,6 +378,46 @@ mdb_find_next_leaf(MdbHandle *mdb, MdbIndexChain *chain)
 	return NULL;

 }
+MdbIndexPage *
+mdb_chain_add_page(MdbHandle *mdb, MdbIndexChain *chain, guint32 pg)
+{
+	MdbIndexPage *ipg;
+
+	chain->cur_depth++;
+	if (chain->cur_depth > MDB_MAX_INDEX_DEPTH) {
+		fprintf(stderr,"Error! maximum index depth of %d exceeded.  This is probably due to a programming bug, If you are confident that your indexes really are this deep, adjust MDB_MAX_INDEX_DEPTH in mdbtools.h and recompile.\n", MDB_MAX_INDEX_DEPTH);
+		exit(1);
+	}
+	ipg = &(chain->pages[chain->cur_depth - 1]);
+	mdb_index_page_init(ipg);
+	ipg->pg = pg;
+
+	return ipg;
+}
+MdbIndexPage *
+mdb_index_read_bottom_pg(MdbHandle *mdb, MdbIndex *idx, MdbIndexChain *chain)
+{
+	MdbIndexPage *ipg;
+
+	/*
+	 * if it's new use the root index page (idx->first_pg)
+	 */
+	if (!chain->cur_depth) {
+		ipg = &(chain->pages[0]);
+		mdb_index_page_init(ipg);
+		chain->cur_depth = 1;
+		ipg->pg = idx->first_pg;
+		if (!(ipg = mdb_find_next_leaf(mdb, idx, chain)))
+			return 0;
+	} else {
+		ipg = &(chain->pages[chain->cur_depth - 1]);
+		ipg->len = 0; 
+	}
+
+	mdb_read_pg(mdb, ipg->pg);
+
+	return ipg;
+}
 /*
 * the main index function.
 * caller provides an index chain which is the current traversal of index
@@ -401,22 +436,8 @@ mdb_index_find_next(MdbHandle *mdb, MdbIndex *idx, MdbIndexChain *chain, guint32
 	MdbIndexPage *ipg;
 	int passed = 0;

-	/*
-	 * if it's new use the root index page (idx->first_pg)
-	 */
-	if (!chain->cur_depth) {
-		ipg = &(chain->pages[0]);
-		mdb_index_page_init(ipg);
-		chain->cur_depth = 1;
-		ipg->pg = idx->first_pg;
-		if (!(ipg = mdb_find_next_leaf(mdb, chain)))
-			return 0;
-	} else {
-		ipg = &(chain->pages[chain->cur_depth - 1]);
-		ipg->len = 0; 
-	}

-	mdb_read_pg(mdb, ipg->pg);
+	ipg = mdb_index_read_bottom_pg(mdb, idx, chain);

 	/*
 	 * loop while the sargs don't match
@@ -436,7 +457,7 @@ mdb_index_find_next(MdbHandle *mdb, MdbIndex *idx, MdbIndexChain *chain, guint32
 			 */
 			while (chain->cur_depth>1) {
 				chain->cur_depth--;
-				if (!(ipg = mdb_find_next_leaf(mdb, chain)))
+				if (!(ipg = mdb_find_next_leaf(mdb, idx, chain)))
 					return 0;
 				mdb_index_find_next_on_page(mdb, ipg);
 			}
--- a/src/libmdb/table.c
+++ b/src/libmdb/table.c
@@ -82,8 +82,8 @@ int rownum, row_start, row_end;


 	/* now grab the free space page map */
-#if 0
-	mdb_swap_pgbuf(mdb);
+#if 1
+	//mdb_swap_pgbuf(mdb);
 	rownum = mdb->pg_buf[fmt->tab_free_map_offset];
 	mdb_read_alt_pg(mdb, mdb_pg_get_int24(mdb, fmt->tab_free_map_offset + 1));
 	mdb_swap_pgbuf(mdb);
@@ -92,6 +92,7 @@ int rownum, row_start, row_end;
 	table->freemap_sz = row_end - row_start + 1;
 	table->free_usage_map = malloc(table->freemap_sz);
 	memcpy(table->free_usage_map, &mdb->pg_buf[row_start], table->freemap_sz);
+	mdb_swap_pgbuf(mdb);
 #endif

 	table->first_data_pg = mdb_pg_get_int16(mdb, fmt->tab_first_dpg_offset);
--- a/src/libmdb/write.c
+++ b/src/libmdb/write.c
@@ -246,7 +246,7 @@ int i;
 		/* column is null is bit is clear (0) */
 		if (!fields[i].is_null) {
 			byte |= 1 << bit;
-			printf("%d %d %d %d\n", i, bit, 1 << bit, byte);
+			//printf("%d %d %d %d\n", i, bit, 1 << bit, byte);
 		}
 		bit++;
 		if (bit==8) {
@@ -302,9 +302,48 @@ mdb_update_indexes(MdbTableDef *table, int num_fields, MdbField *fields)
 #if MDB_DEBUG_WRITE
 		fprintf(stderr,"Updating %s (%d).\n", idx->name, idx->index_type);
 #endif
+		if (idx->index_type==1) {
+			mdb_update_index(table, idx, num_fields, fields);
+		}
 	}
 }

+mdb_init_index_chain(MdbTableDef *table, MdbIndex *idx)
+{
+	MdbCatalogEntry *entry = table->entry;
+	MdbHandle *mdb = entry->mdb;
+
+	table->scan_idx = idx;
+	table->chain = g_malloc0(sizeof(MdbIndexChain));
+	table->mdbidx = mdb_clone_handle(mdb);
+	mdb_read_pg(table->mdbidx, table->scan_idx->first_pg);
+}
+int
+mdb_update_index(MdbTableDef *table, MdbIndex *idx, int num_fields, MdbField *fields)
+{
+	int idx_xref[16];
+	int i, j;
+
+	for (i = 0; i < idx->num_keys; i++) {
+		for (j = 0; j < num_fields; j++) {
+			// key_col_num is 1 based, can't remember why though
+			if (fields[j].colnum == idx->key_col_num[i]-1)
+				idx_xref[i] = j;
+		}
+	}
+	for (i = 0; i < idx->num_keys; i++) {
+		fprintf(stdout, "key col %d (%d) is mapped to field %d (%d %d)\n",
+			i, idx->key_col_num[i], idx_xref[i], fields[idx_xref[i]].colnum, 
+			fields[idx_xref[i]].siz);
+	}
+	for (i = 0; i < num_fields; i++) {
+		fprintf(stdout, "%d (%d %d)\n",
+			i, fields[i].colnum, 
+			fields[i].siz);
+	}
+	//mdb_find_leaf_pg();
+}
+
 int
 mdb_insert_row(MdbTableDef *table, int num_fields, MdbField *fields)
 {
@@ -330,11 +369,39 @@ mdb_insert_row(MdbTableDef *table, int num_fields, MdbField *fields)
 		return 0;
 	}

+	mdb_add_row_to_pg(table, row_buffer, new_row_size);
+
+#if MDB_DEBUG_WRITE
+	buffer_dump(mdb->pg_buf, 0, 39);
+	buffer_dump(mdb->pg_buf, fmt->pg_size - 160, fmt->pg_size-1);
+	fprintf(stdout, "writing page %d\n", pgnum);
+#endif
+	if (!mdb_write_pg(mdb, pgnum)) {
+		fprintf(stderr, "write failed! exiting...\n");
+		exit(1);
+	}
+
+	mdb_update_indexes(table, num_fields, fields);
+}
+/*
+ * Assumes caller has verfied space is available on page and adds the new 
+ * row to the current pg_buf.
+ */
+void
+mdb_add_row_to_pg(MdbTableDef *table, unsigned char *row_buffer, int new_row_size)
+{
+	unsigned char *new_pg;
+	int num_rows, i, pos, row_start, row_end, row_size;
+	MdbCatalogEntry *entry = table->entry;
+	MdbHandle *mdb = entry->mdb;
+	MdbFormatConstants *fmt = mdb->fmt;

 	new_pg = mdb_new_data_pg(entry);
+
 	num_rows = mdb_pg_get_int16(mdb, fmt->row_count_offset);
 	pos = mdb->fmt->pg_size;

+	/* copy existing rows */
 	for (i=0;i<num_rows;i++) {
 		row_start = mdb_pg_get_int16(mdb, (fmt->row_count_offset + 2) + (i*2));
 		row_end = mdb_find_end_of_row(mdb, i);
@@ -347,19 +414,19 @@ mdb_insert_row(MdbTableDef *table, int num_fields, MdbField *fields)
 	/* add our new row */
 	pos -= new_row_size;
 	memcpy(&new_pg[pos], row_buffer, new_row_size);
+	/* add row to the row offset table */
 	_mdb_put_int16(new_pg, (fmt->row_count_offset + 2) + (num_rows*2), pos);

+	/* update number rows on this page */
 	num_rows++;
 	_mdb_put_int16(new_pg, fmt->row_count_offset, num_rows);

+	/* copy new page over old */
 	memcpy(mdb->pg_buf, new_pg, fmt->pg_size);
 	g_free(new_pg);
-#if MDB_DEBUG_WRITE
-	buffer_dump(mdb->pg_buf, 0, 39);
-	buffer_dump(mdb->pg_buf, fmt->pg_size - 160, fmt->pg_size-1);
-#endif

-	mdb_update_indexes(table, num_fields, fields);
+	/* update the freespace */
+	_mdb_put_int16(mdb->pg_buf, 2, mdb_pg_get_freespace(mdb));
 }
 int 
 mdb_update_row(MdbTableDef *table)
--- a/src/sql/mdbsql.c
+++ b/src/sql/mdbsql.c
@@ -418,6 +418,10 @@ MdbSQLSarg *sql_sarg;
 		mdb_free_tabledef(sql->cur_table);
 		sql->cur_table = NULL;
 	}
+	if (sql->kludge_ttable_pg) {
+		g_free(sql->kludge_ttable_pg);
+		sql->kludge_ttable_pg = NULL;
+	}
 	for (i=0;i<sql->num_columns;i++) {
 		c = g_ptr_array_index(sql->columns,i);
 		mdb_sql_free_column(c);
@@ -476,9 +480,18 @@ int vlen;
 }
 void mdb_sql_listtables(MdbSQL *sql)
 {
-int i;
-MdbCatalogEntry *entry;
-MdbHandle *mdb = sql->mdb;
+	int i;
+	MdbCatalogEntry *entry;
+	MdbHandle *mdb = sql->mdb;
+	MdbField fields[4];
+	int num_fields = 0;
+	char tmpstr[256];
+	unsigned char row_buffer[4096];
+	unsigned char *new_pg;
+	int row_size;
+	MdbTableDef *ttable, *table = NULL;
+	MdbColumn *col, tcol;
+	MdbSQLColumn *sqlcol;

 	if (!mdb) {
 		mdb_sql_error("You must connect to a database first");
@@ -486,36 +499,63 @@ MdbHandle *mdb = sql->mdb;
 	}
 	mdb_read_catalog (mdb, MDB_TABLE);

+	ttable = mdb_create_temp_table(mdb, "#listtables");
+
+	memset(&tcol,0,sizeof(MdbColumn));
+	strcpy(tcol.name, "Tables");
+	tcol.col_size = 30;
+	tcol.col_type = MDB_TEXT;
+	tcol.is_fixed = 0;
+	mdb_temp_table_add_col(ttable, &tcol);
+	mdb_sql_add_column(sql, "Tables");
+	sqlcol = g_ptr_array_index(sql->columns,0);
+	sqlcol->disp_size = mdb_col_disp_size(&tcol);
+
+	/* blank out the pg_buf */
+	new_pg = mdb_new_data_pg(ttable->entry);
+	memcpy(mdb->pg_buf, new_pg, mdb->fmt->pg_size);
+	g_free(new_pg);

-	print_break (30,1);
-	fprintf(stdout,"\n");
-	print_value ("Tables",30,1);
-	fprintf(stdout,"\n");
-	print_break (30,1);
-	fprintf(stdout,"\n");
 	/* loop over each entry in the catalog */
 	for (i=0; i < mdb->num_catalog; i++) {
-     	entry = g_ptr_array_index (mdb->catalog, i);
-     	/* if it's a table */
-     	if (entry->object_type == MDB_TABLE) {
-       		if (strncmp (entry->object_name, "MSys", 4)) {
-				print_value (entry->object_name,30,1);
-				fprintf(stdout,"\n");
+     		entry = g_ptr_array_index (mdb->catalog, i);
+     		/* if it's a table */
+     		if (entry->object_type == MDB_TABLE) {
+       			if (strncmp (entry->object_name, "MSys", 4)) {
+          			col = g_ptr_array_index(table->columns,0);
+   				fields[0].value = entry->object_name;
+   				fields[0].siz = strlen(entry->object_name); 
+   				fields[0].is_fixed = 0;
+   				fields[0].is_null = 0;
+   				fields[0].start = 0;
+   				fields[0].colnum = 0;
+
+				row_size = mdb_pack_row(ttable, row_buffer, 1, &fields);
+				mdb_add_row_to_pg(ttable,row_buffer, row_size);
+				ttable->num_rows++;
 			}
 		}
 	}
-	print_break (30,1);
-	fprintf(stdout,"\n");
+	sql->kludge_ttable_pg = g_memdup(mdb->pg_buf, mdb->fmt->pg_size);
+	sql->cur_table = ttable;
+
 }
 void mdb_sql_describe_table(MdbSQL *sql)
 {
-MdbTableDef *table = NULL;
-MdbSQLTable *sql_tab;
-MdbCatalogEntry *entry;
-MdbHandle *mdb = sql->mdb;
-MdbColumn *col;
-int i;
-char colsize[11];
+	MdbTableDef *ttable, *table = NULL;
+	MdbSQLTable *sql_tab;
+	MdbCatalogEntry *entry;
+	MdbHandle *mdb = sql->mdb;
+	MdbColumn *col, tcol;
+	MdbSQLColumn *sqlcol;
+	int i;
+	char colsize[11];
+	MdbField fields[4];
+	int num_fields = 0;
+	char tmpstr[256];
+	unsigned char row_buffer[4096];
+	unsigned char *new_pg;
+	int row_size;

 	if (!mdb) {
 		mdb_sql_error("You must connect to a database first");
@@ -543,35 +583,78 @@ char colsize[11];

 	mdb_read_columns(table);

-	print_break (30,1);
-	print_break (20,0);
-	print_break (10,0);
-	fprintf(stdout,"\n");
-	print_value ("Column Name",30,1);
-	print_value ("Type",20,0);
-	print_value ("Size",10,0);
-	fprintf(stdout,"\n");
-	print_break (30,1);
-	print_break (20,0);
-	print_break (10,0);
-	fprintf(stdout,"\n");
+	ttable = mdb_create_temp_table(mdb, "#describe");
+
+	memset(&tcol,0,sizeof(MdbColumn));
+	strcpy(tcol.name, "Column Name");
+	tcol.col_size = 30;
+	tcol.col_type = MDB_TEXT;
+	tcol.is_fixed = 0;
+	mdb_temp_table_add_col(ttable, &tcol);
+	mdb_sql_add_column(sql, "Column Name");
+	sqlcol = g_ptr_array_index(sql->columns,0);
+	sqlcol->disp_size = mdb_col_disp_size(&tcol);
+
+	memset(&tcol,0,sizeof(MdbColumn));
+	strcpy(tcol.name, "Type");
+	tcol.col_size = 20;
+	tcol.col_type = MDB_TEXT;
+	tcol.is_fixed = 0;
+	mdb_temp_table_add_col(ttable, &tcol);
+	mdb_sql_add_column(sql, "Type");
+	sqlcol = g_ptr_array_index(sql->columns,1);
+	sqlcol->disp_size = mdb_col_disp_size(&tcol);
+
+	memset(&tcol,0,sizeof(MdbColumn));
+	strcpy(tcol.name, "Size");
+	tcol.col_size = 10;
+	tcol.col_type = MDB_TEXT;
+	tcol.is_fixed = 0;
+	mdb_temp_table_add_col(ttable, &tcol);
+	mdb_sql_add_column(sql, "Size");
+	sqlcol = g_ptr_array_index(sql->columns,2);
+	sqlcol->disp_size = mdb_col_disp_size(&tcol);
+
+	/* blank out the pg_buf */
+	new_pg = mdb_new_data_pg(ttable->entry);
+	memcpy(mdb->pg_buf, new_pg, mdb->fmt->pg_size);
+	g_free(new_pg);

     for (i=0;i<table->num_cols;i++) {
+
          col = g_ptr_array_index(table->columns,i);
-    
-		print_value (col->name,30,1);
-		print_value (mdb_get_coltype_string(mdb->default_backend, col->col_type),20,0);
+   		fields[0].value = col->name; 
+   		fields[0].siz = strlen(col->name); 
+   		fields[0].is_fixed = 0;
+   		fields[0].is_null = 0;
+   		fields[0].start = 0;
+   		fields[0].colnum = 0;
+
+		strcpy(tmpstr, mdb_get_coltype_string(mdb->default_backend, col->col_type));
+   		fields[1].value = tmpstr; 
+   		fields[1].siz = strlen(tmpstr); 
+   		fields[1].is_fixed = 0;
+   		fields[1].is_null = 0;
+   		fields[1].start = 0;
+   		fields[1].colnum = 1;
+
 		sprintf(colsize,"%d",col->col_size);
-		print_value (colsize,10,0);
-		fprintf(stdout,"\n");
+   		fields[2].value = colsize; 
+   		fields[2].siz = strlen(colsize); 
+   		fields[2].is_fixed = 0;
+   		fields[2].is_null = 0;
+   		fields[2].start = 0;
+   		fields[2].colnum = 2;
+
+		row_size = mdb_pack_row(ttable, row_buffer, 3, &fields);
+		mdb_add_row_to_pg(ttable,row_buffer, row_size);
+		ttable->num_rows++;
     }
-	print_break (30,1);
-	print_break (20,0);
-	print_break (10,0);
-	fprintf(stdout,"\n");

 	/* the column and table names are no good now */
-	mdb_sql_reset(sql);
+	//mdb_sql_reset(sql);
+	sql->kludge_ttable_pg = g_memdup(mdb->pg_buf, mdb->fmt->pg_size);
+	sql->cur_table = ttable;
 }

 int mdb_sql_find_sargcol(MdbSargNode *node, gpointer data)
--- a/src/util/updrow.c
+++ b/src/util/updrow.c
@@ -95,18 +95,30 @@ MdbColumn *col;
 }
 void read_to_row(MdbTableDef *table, char *sargname)
 {
-MdbSarg sarg;
-char *sargcol, *sargop, *sargval;
+	static MdbSargNode sarg;
+	char *sargcol, *sargop, *sargval;
+	int i;
+	MdbColumn *col;


 	if (sargname) {
 		sargcol = strtok(sargname," ");
+		for (i=0;i<table->num_cols;i++) {
+			col=g_ptr_array_index(table->columns,i);
+			if (!strcasecmp(col->name, (char *)sargcol)) {
+				sarg.col = col;
+				break;
+			}
+		}
+
 		sargop = strtok(NULL," ");
 		sargval = strtok(NULL," ");
 		printf("col %s op %s val %s\n",sargcol,sargop,sargval);
        	sarg.op = MDB_EQUAL; /* only support = for now, sorry */
 		sarg.value.i = atoi(sargval);
-		mdb_add_sarg_by_name(table, sargcol, &sarg);
+		table->sarg_tree = &sarg;
+
+		// mdb_add_sarg_by_name(table, sargcol, &sarg);
 	}

        mdb_rewind_table(table);