feat(server-version): initial commit
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README.md
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README.md
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# rgncycle-libpq
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libpq API for regional cycle
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## preparation
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```
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sudo apt update
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sudo apt install make --no-install-recommends
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sudo apt install build-essential --no-install-recommends
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sudo apt install libpq-dev --no-install-recommends
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```
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#include <stdio.h>
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#include <stdlib.h>
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#include <libpq-fe.h>
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void do_exit(PGconn *conn) {
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fprintf(stderr, "%s\n", PQerrorMessage(conn));
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/*close connection and free memory*/
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PQfinish(conn);
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exit(EXIT_FAILURE);
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}
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int main(int argc, char **argv) {
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/*declaration*/
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const char *conninfo;
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printf("main() Started...\n");
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/*read command line*/
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if (argc > 1){
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printf("main() argv[1]: %s\n", argv[1]);
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conninfo = argv[1];
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}else{
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printf("call ./main <connection info>\n");
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return 1;
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}
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/*connect to database*/
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PGconn *conn = PQconnectdb(conninfo);
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if (PQstatus(conn) == CONNECTION_BAD) {
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fprintf(stderr, "Connection to database failed: %s\n",
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PQerrorMessage(conn));
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do_exit(conn);
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}else if(PQstatus(conn)==CONNECTION_OK){
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printf("main() connected to database\n");
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}else{
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printf("main() connection status NOT known\n");
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}
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char *user = PQuser(conn);
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char *db_name = PQdb(conn);
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char *pswd = PQpass(conn);
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printf("User: %s\n", user);
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printf("Database name: %s\n", db_name);
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printf("Password: %s\n", pswd);
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/*return integer representing database version*/
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int ver = PQserverVersion(conn);
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printf("Server version: %d\n", ver);
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PQfinish(conn);
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return 0;
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}
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# Docu
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#
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#$@ is the name of the file to be made
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#$? is the names of the changed dependents
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#$< the name of the related file that caused the action
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#$* the prefix shared by target and dependent files
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#
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# Others
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RM = /bin/rm -f
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#
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# Source, Executable, Includes, Library Defines
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EXE = main
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#
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# Compiler, Linker Defines
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CC = /usr/bin/gcc
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#
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all: main.o
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$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
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#
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main.o:
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$(CC) -c main.c -I/usr/include/postgresql
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# Clean Up Objects, Exectuables, Dumps out of source directory
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clean:
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$(RM) *.o $(EXE) *~
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# Docu
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#
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#$@ is the name of the file to be made
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#$? is the names of the changed dependents
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#$< the name of the related file that caused the action
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#$* the prefix shared by target and dependent files
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#
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# Others
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RM = /bin/rm -f
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#
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# Source, Executable, Includes, Library Defines
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EXE = main
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#
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# Compiler, Linker Defines
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CC = /usr/bin/gcc
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#
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all:
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$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
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# Clean Up Objects, Exectuables, Dumps out of source directory
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clean:
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$(RM) *.o $(EXE) *~
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@ -0,0 +1,24 @@
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# Docu
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#
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#$@ is the name of the file to be made
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#$? is the names of the changed dependents
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#$< the name of the related file that caused the action
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#$* the prefix shared by target and dependent files
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#
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# Others
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RM = /bin/rm -f
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#
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# Source, Executable, Includes, Library Defines
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EXE = main
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#
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# Compiler, Linker Defines
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CC = /usr/bin/gcc
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#
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all: main.o
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$(CC) main.c -I/usr/include/postgresql -L/usr/lib/x86_64-linux-gnu -lpq -std=c99 -Wall -o $(EXE)
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#
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main.o:
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$(CC) -c main.c -I/usr/include/postgresql
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# Clean Up Objects, Exectuables, Dumps out of source directory
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clean:
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$(RM) *.o $(EXE) *~
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* build
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```
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make
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```
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* run
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```
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./main 'postgresql://<user>:<secret>@<hostname>:<port>/<db>'
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```
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* or run
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```
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./main 'postgresql://<user>:<secret>@<hostname>:<port>/<db>'
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```
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* or run
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```
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./main "host=<hostname> port=<port> user=<user> password=<<secret>> dbname=<db>"
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```
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