feat: add server-version

example1/readme.md

@@ -14,4 +14,10 @@ make
 
 ```
 ./main 'postgresql://begerad:secret@localhost:5432/vbn_data'
+```
+
+* or run
+
+```
+./main 'host=localhost port=5432 user=begerad password=<secret> dbname=vbn_data'
 ```

lib-version/main.c

@@ -1,9 +1,8 @@
 #include <stdio.h>
 #include <libpq-fe.h>
 int main() {
+  /*return version of libpq*/
   int lib_ver = PQlibVersion();
   printf("Version of libpq: %d\n", lib_ver);
-  printf("Version of libpq: %d\n", lib_ver);
-  printf("Version of libpq: %d\n", lib_ver);
   return 0;
 }

lib-version/makefile

@@ -14,8 +14,11 @@ EXE    = main
 # Compiler, Linker Defines
 CC      = /usr/bin/gcc
 #
-all:
+all: main.o
 	$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
+#
+main.o:
+	$(CC) -c main.c -I/usr/include/postgresql
 # Clean Up Objects, Exectuables, Dumps out of source directory
 clean:
 	$(RM) *.o $(EXE) *~

lib-version/makefile-fine2

@@ -0,0 +1,24 @@
+# Docu
+#
+#$@ is the name of the file to be made
+#$? is the names of the changed dependents
+#$< the name of the related file that caused the action
+#$* the prefix shared by target and dependent files
+#
+# Others
+RM      = /bin/rm -f
+#
+# Source, Executable, Includes, Library Defines
+EXE    = main
+#
+# Compiler, Linker Defines
+CC      = /usr/bin/gcc
+#
+all: main.o
+	$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
+#
+main.o:
+	$(CC) -c main.c -I/usr/include/postgresql
+# Clean Up Objects, Exectuables, Dumps out of source directory
+clean:
+	$(RM) *.o $(EXE) *~

server-version/main.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <libpq-fe.h>
+
+void do_exit(PGconn *conn) {
+  /*close connection and free memory*/
+  PQfinish(conn);
+  exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv) {
+  /*declaration*/
+  const char *conninfo;
+  
+  printf("main() Started...\n");
+
+  /*read command line*/
+  if (argc > 1){
+    printf("main() argv[1]: %s\n", argv[1]);
+    conninfo = argv[1];
+  }else{
+    conninfo = "dbname=postgres";
+  }
+
+  /*connect to database*/
+  PGconn *conn = PQconnectdb(conninfo);
+
+  if (PQstatus(conn) == CONNECTION_BAD) {
+    fprintf(stderr, "Connection to database failed: %s\n",
+            PQerrorMessage(conn));
+    do_exit(conn);
+  }else if(PQstatus(conn)==CONNECTION_OK){
+    printf("main() connected to database\n");
+  }else{
+    printf("main() connection status NOT known\n");
+  }
+
+  char *user = PQuser(conn);
+  char *db_name = PQdb(conn);
+  char *pswd = PQpass(conn);
+  printf("User: %s\n", user);
+  printf("Database name: %s\n", db_name);
+  printf("Password: %s\n", pswd);
+
+    /*return integer representing database version*/
+  int ver = PQserverVersion(conn);
+  printf("Server version: %d\n", ver);
+
+  do_exit(conn);
+}

server-version/makefile

@@ -0,0 +1,24 @@
+# Docu
+#
+#$@ is the name of the file to be made
+#$? is the names of the changed dependents
+#$< the name of the related file that caused the action
+#$* the prefix shared by target and dependent files
+#
+# Others
+RM      = /bin/rm -f
+#
+# Source, Executable, Includes, Library Defines
+EXE    = main
+#
+# Compiler, Linker Defines
+CC      = /usr/bin/gcc
+#
+all: main.o
+	$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
+#
+main.o:
+	$(CC) -c main.c -I/usr/include/postgresql
+# Clean Up Objects, Exectuables, Dumps out of source directory
+clean:
+	$(RM) *.o $(EXE) *~

server-version/makefile-fine

@@ -0,0 +1,21 @@
+# Docu
+#
+#$@ is the name of the file to be made
+#$? is the names of the changed dependents
+#$< the name of the related file that caused the action
+#$* the prefix shared by target and dependent files
+#
+# Others
+RM      = /bin/rm -f
+#
+# Source, Executable, Includes, Library Defines
+EXE    = main
+#
+# Compiler, Linker Defines
+CC      = /usr/bin/gcc
+#
+all:
+	$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
+# Clean Up Objects, Exectuables, Dumps out of source directory
+clean:
+	$(RM) *.o $(EXE) *~

server-version/makefile-fine2

@@ -0,0 +1,24 @@
+# Docu
+#
+#$@ is the name of the file to be made
+#$? is the names of the changed dependents
+#$< the name of the related file that caused the action
+#$* the prefix shared by target and dependent files
+#
+# Others
+RM      = /bin/rm -f
+#
+# Source, Executable, Includes, Library Defines
+EXE    = main
+#
+# Compiler, Linker Defines
+CC      = /usr/bin/gcc
+#
+all: main.o
+	$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
+#
+main.o:
+	$(CC) -c main.c -I/usr/include/postgresql
+# Clean Up Objects, Exectuables, Dumps out of source directory
+clean:
+	$(RM) *.o $(EXE) *~

server-version/readme.md

@@ -0,0 +1,23 @@
+* build
+
+```
+make
+```
+
+* run
+
+```
+./main 'postgresql://begerad:secret@localhost:5432/sib00_vbn_gtfs'
+```
+
+* or run
+
+```
+./main 'postgresql://begerad:secret@localhost:5432/vbn_data'
+```
+
+* or run
+
+```
+./main "host=localhost port=5432 user=begerad password=<secret> dbname=vbn_data"
+```