andmebaasid

praktikum 2.9/psql.c

+#include <stdio.h>
+#include <pgsql/libpq-fe.h>
+
+void yl1(PGconn*);
+
+int main(void)
+{
+    PGconn *conn;
+
+
+    conn = PQconnectdb("dbname=ablib host=ewis.pld.ttu.ee user=student password=iag0582");
+
+    if (PQstatus(conn) == CONNECTION_BAD) {
+        printf("We were unable to connect to the database\n");
+        return 0;
+    }
+    yl1(conn);
+
+    return 0;
+}
+
+void yl1(PGconn *conn)
+{
+    PGresult *res;
+    int rec_count;
+    int row;
+    int col;
+
+    res = PQexec(conn, "SELECT name, length_km FROM river LIMIT 5;");
+
+    if (PQresultStatus(res) != PGRES_TUPLES_OK) {
+        printf("We did not get any data!\n");
+        PQfinish(conn);
+    } else {
+
+        rec_count = PQntuples(res);
+
+        printf("We received %d records.\n", rec_count);
+
+        printf("==========================\n");
+
+        for (row=0; row<rec_count; row++) {
+            for (col=0; col<2; col++) {
+                printf("%-10s\t", PQgetvalue(res, row, col));
+            }
+            printf("\n");
+        }
+
+        printf("==========================\n");
+    }
+}

praktikum 2.9/yl.c

+#include <stdio.h>
+#include <pgsql/libpq-fe.h>
+
+void yl1(PGconn*);
+void yl2(PGconn*);
+void yl3(PGconn*);
+
+int main(void)
+{
+    PGconn *conn;
+
+    conn = PQconnectdb("dbname=ablid host=ewis.pld.ttu.ee user=student password=iag0582");
+
+    if (PQstatus(conn) == CONNECTION_BAD) {
+        printf("We were unable to connect to the database\n");
+        return 0;
+    }
+    //yl1(conn); tehtud!
+    //yl2(conn); tehtud!
+    yl3(conn);
+    return 0;
+}
+
+void yl1(PGconn *conn)
+{
+    PGresult *res;
+    int rec_count;
+    int row;
+    int col;
+
+    res = PQexec(conn, "SELECT joenimi, pikkus_km FROM joe_andmed ORDER BY pikkus_km DESC LIMIT 5;");
+
+    if (PQresultStatus(res) != PGRES_TUPLES_OK) {
+        printf("We did not get any data!\n");
+        PQfinish(conn);
+    } else {
+
+        rec_count = PQntuples(res);
+
+        printf("We received %d records.\n", rec_count);
+
+        printf("==========================\n");
+
+        for (row=0; row<rec_count; row++) {
+            for (col=0; col<2; col++) {
+                printf("%-10s\t", PQgetvalue(res, row, col));
+            }
+            printf("\n");
+        }
+
+        printf("==========================\n");
+    }
+}
+
+//Pärida jõed, mis on peajõed ja pikemad kui 70km.Peajõe kindlaks tegemiseks saab kasutada id_peajogi välja.
+
+void yl2(PGconn *conn)
+{
+    PGresult *res;
+    int rec_count;
+    int row;
+    int col;
+
+    res = PQexec(conn, "SELECT joenimi, pikkus_km FROM joe_andmed WHERE pikkus_km > 70 AND id_peajogi = id_jogi ORDER BY pikkus_km DESC;");
+
+    if (PQresultStatus(res) != PGRES_TUPLES_OK) {
+        printf("We did not get any data!\n");
+        PQfinish(conn);
+    } else {
+
+        rec_count = PQntuples(res);
+
+        printf("We received %d records.\n", rec_count);
+
+        printf("==========================\n");
+
+        for (row=0; row<rec_count; row++) {
+            for (col=0; col<2; col++) {
+                printf("%-10s\t", PQgetvalue(res, row, col));
+            }
+            printf("\n");
+        }
+
+        printf("==========================\n");
+    }
+}
+
+//Leida eelmises punktis leitud jõgedel asetsevad seirejaamad.
+
+void yl3(PGconn *conn)
+{
+    PGresult *res;
+    PGresult *res1;
+    PGresult *res2;
+    int rec_count;
+    int row;
+    int col;
+
+    //res = PQexec(conn, "SELECT joenimi, id_jogi FROM joe_andmed WHERE pikkus_km > 70 AND id_peajogi = id_jogi INNER JOIN seire_jaamad ON ;");
+    res = PQexec(conn, "SELECT joenimi, id_jogi FROM joe_andmed INNER JOIN seire_jaamad ON
+
+
+    if (PQresultStatus(res) != PGRES_TUPLES_OK) {
+        printf("We did not get any data!\n");
+        PQfinish(conn);
+    } else {
+
+        rec_count = PQntuples(res);
+
+        printf("We received %d records.\n", rec_count);
+
+        printf("==========================\n");
+
+        for (row=0; row<rec_count; row++) {
+            for (col=0; col<2; col++) {
+                printf("%-10s\t", PQgetvalue(res, row, col));
+            }
+            printf("\n");
+        }
+
+        printf("==========================\n");
+    }
+
+}