treat empty as NULL

diff --git a/servers/slapd/back-sql/schema-map.c b/servers/slapd/back-sql/schema-map.c
index d64d5e937e1ecef30a5573e5a2fe9195be18117c..a9405a010f148931189c0370c613525cee280c6e 100644 (file)
--- a/servers/slapd/back-sql/schema-map.c
+++ b/servers/slapd/back-sql/schema-map.c
@@ -352,7 +352,7 @@ backsql_oc_get_attr_mapping( void *v_oc, void *v_bas )
                at_map->bam_ad = ad;
 
                ber_str2bv( at_row.cols[ 1 ], 0, 1, &at_map->bam_sel_expr );
-               if ( at_row.value_len[ 8 ] < 0 ) {
+               if ( at_row.value_len[ 8 ] <= 0 ) {
                        BER_BVZERO( &at_map->bam_sel_expr_u );
 
                } else {
@@ -363,7 +363,7 @@ backsql_oc_get_attr_mapping( void *v_oc, void *v_bas )
                ber_str2bv( at_row.cols[ 2 ], 0, 0, &bv );
                backsql_merge_from_clause( bas->bas_bi, &bb, &bv );
                at_map->bam_from_tbls = bb.bb_val;
-               if ( at_row.value_len[ 3 ] < 0 ) {
+               if ( at_row.value_len[ 3 ] <= 0 ) {
                        BER_BVZERO( &at_map->bam_join_where );
 
                } else {
@@ -499,16 +499,16 @@ backsql_load_schema_map( backsql_info *bi, SQLHDBC dbh )
                
                ber_str2bv( oc_row.cols[ 2 ], 0, 1, &oc_map->bom_keytbl );
                ber_str2bv( oc_row.cols[ 3 ], 0, 1, &oc_map->bom_keycol );
-               oc_map->bom_create_proc = ( oc_row.value_len[ 4 ] < 0 ) ? NULL 
+               oc_map->bom_create_proc = ( oc_row.value_len[ 4 ] <= 0 ) ? NULL 
                        : ch_strdup( oc_row.cols[ 4 ] );
 
                colnum = 5;
                if ( BACKSQL_CREATE_NEEDS_SELECT( bi ) ) {
                        colnum = 6;
-                       oc_map->bom_create_keyval = ( oc_row.value_len[ 5 ] < 0 ) 
+                       oc_map->bom_create_keyval = ( oc_row.value_len[ 5 ] <= 0 ) 
                                ? NULL : ch_strdup( oc_row.cols[ 5 ] );
                }
-               oc_map->bom_delete_proc = ( oc_row.value_len[ colnum ] < 0 ) ? NULL 
+               oc_map->bom_delete_proc = ( oc_row.value_len[ colnum ] <= 0 ) ? NULL 
                        : ch_strdup( oc_row.cols[ colnum ] );
                if ( lutil_atoix( &oc_map->bom_expect_return, oc_row.cols[ colnum + 1 ], 0 ) != 0 ) {
                        Debug( LDAP_DEBUG_TRACE, "backsql_load_schema_map(): "