feat: add simple_query
This commit is contained in:
parent
1725cebc74
commit
266a9f8937
|
@ -0,0 +1,59 @@
|
|||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <libpq-fe.h>
|
||||
|
||||
void do_exit(PGconn *conn) {
|
||||
PQfinish(conn);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
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{
|
||||
printf("call ./main <connection info>\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*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);
|
||||
|
||||
/*retrive server of database using SQL statement*/
|
||||
/*PGRES_TUPLS_OK is returned for a query that returns data*/
|
||||
PGresult *res = PQexec(conn, "SELECT VERSION()");
|
||||
if (PQresultStatus(res) != PGRES_TUPLES_OK) {
|
||||
printf("No data retrieved\n");
|
||||
PQclear(res);
|
||||
do_exit(conn);
|
||||
}
|
||||
|
||||
/*return a single field value of one row*/
|
||||
printf("%s\n", PQgetvalue(res, 0, 0));
|
||||
PQclear(res);
|
||||
PQfinish(conn);
|
||||
return 0;
|
||||
}
|
|
@ -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 $(EXE) *~
|
|
@ -0,0 +1,21 @@
|
|||
# Docu
|
||||
#
|
||||
#$@ 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 $(EXE) *~
|
|
@ -0,0 +1,24 @@
|
|||
# Docu
|
||||
#
|
||||
#$@ 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) *~
|
|
@ -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"
|
||||
```
|
Loading…
Reference in New Issue