implement autoadjustment

diff --git a/linux/dbstore.c b/linux/dbstore.c
index 1a85dbac1a7a50eb2564982cead098587f1fcc08..56e5ba4b53696737e49ffe33ca2910410eaff159 100644 (file)
--- a/linux/dbstore.c
+++ b/linux/dbstore.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <stdint.h>
 #include <time.h>
 #include <ctype.h>
@@ -68,8 +69,10 @@ int dbstore(uint8_t which, uint32_t val)
        struct tm tm;
        char buf[64];
        char tstr[32];
-       char *table = (which == 1) ? "coldcnt" : "hotcnt";
+       char *table = (which == 1) ? "cold" : "hot";
        char statement[64];
+       MYSQL_RES *result;
+       uint32_t prev_val = 0;
 
        t = time(NULL);
        (void)gmtime_r(&t, &tm);
@@ -79,13 +82,40 @@ int dbstore(uint8_t which, uint32_t val)
                g_warning("mysql connect error: %s\n", mysql_error(&mysql));
                return 1;
        }
+       mysql_autocommit(&mysql, FALSE);
+       /* ======== */
        snprintf(statement, sizeof(statement),
-                "insert into %s values (\"%s\",%u);\n",
+                "select value from %scnt order by timestamp desc limit 1;\n",
+                table);
+       if ((rc = mysql_query(&mysql, statement)))
+               g_warning("mysql \"%s\" error: %s\n",
+                               statement, mysql_error(&mysql));
+       else if ((result = mysql_store_result(&mysql))){
+               MYSQL_ROW row = mysql_fetch_row(result);
+               if (row && *row) prev_val = atoi(*row);
+               mysql_free_result(result);
+       }
+       if (val <= prev_val) {
+               snprintf(statement, sizeof(statement),
+                        "insert into %sadj values (\"%s\",%u);\n",
+                        table, tstr, prev_val);
+               g_info("%s %u <= %u, %s", table, val, prev_val, statement);
+               if ((rc = mysql_query(&mysql, statement)))
+                       g_warning("mysql \"%s\" error: %s\n",
+                                       statement, mysql_error(&mysql));
+       }
+       snprintf(statement, sizeof(statement),
+                "insert into %scnt values (\"%s\",%u);\n",
                 table, tstr, val);
-       rc = mysql_query(&mysql, statement);
-       if (rc)
-               g_warning("mysql insert \"%s\" error: %s\n",
+       if ((rc = mysql_query(&mysql, statement)))
+               g_warning("mysql \"%s\" error: %s\n",
                                statement, mysql_error(&mysql));
+       /* ======== */
+       if (!rc) {
+               if ((rc = mysql_commit(&mysql)))
+                       g_warning("mysql commit error: %s\n",
+                                       mysql_error(&mysql));
+       }
        mysql_close(&mysql);
        return rc;
 }