test1.pgc

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

#include <stdlib.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

/* just a test comment */ exec sql whenever sqlerror do PrintAndStop(msg);
exec sql whenever sqlwarning do warn();

static void PrintAndStop(char *msg)
{
	fprintf(stderr, "Error in statement '%s':\n", msg);
	sqlprint();
	exit(-1);
}

static void warn(void)
{
	fprintf(stderr, "Warning: At least one column was truncated\n");
}

/* comment */
exec sql define AMOUNT 6;
exec sql define NAMELEN 8;

exec sql type intarray is int[AMOUNT];

typedef int intarray[AMOUNT];

int
main(void)
{
exec sql begin declare section;
exec sql ifdef NAMELEN;
	typedef char string[NAMELEN];
        intarray amount;
	int increment=100;
        char name[AMOUNT][NAMELEN];
	char letter[AMOUNT][1];
	struct name_letter_struct
	{
		char name[NAMELEN];
		int amount;
		char letter;
	} name_letter[AMOUNT];
exec sql endif;
        struct ind_struct
        {
                short a;
                short b;
                short c;
        } ind[AMOUNT];
	char command[128];
	char *connection="pm";
	int how_many;
	char *user="postgres";
exec sql end declare section;
	exec sql var name is string[AMOUNT];
	char msg[128];
        FILE *dbgs;
        int i,j;

	if ((dbgs = fopen("log", "w")) != NULL)
                ECPGdebug(1, dbgs);

	strcpy(msg, "connect");
	exec sql connect to mm as main;

	strcpy(msg, "connect");
        exec sql connect to pm user :user;

	strcpy(msg, "create");
	exec sql at main create table "Test" (name char(NAMELEN), amount int, letter char(1));
	exec sql create table "Test" (name char(NAMELEN), amount int, letter char(1));

	strcpy(msg, "commit");
	exec sql at main commit;
	exec sql commit;

	strcpy(msg, "set connection");
	exec sql set connection to main;

	strcpy(msg, "execute insert 1");
        sprintf(command, "insert into \"Test\" (name, amount, letter) values ('db: ''mm''', 1, 'f')");
        exec sql execute immediate :command;
	printf("New tuple got OID = %ld\n", sqlca.sqlerrd[1]);
 
        sprintf(command, "insert into \"Test\" (name, amount, letter) values ('db: ''mm''', 2, 't')");
        exec sql execute immediate :command;

        strcpy(msg, "execute insert 2");
        sprintf(command, "insert into \"Test\" (name, amount, letter) values ('db: ''pm''', 1, 'f')");
        exec sql at pm execute immediate :command;

        strcpy(msg, "execute insert 3");
        sprintf(command, "insert into \"Test\" (name, amount, letter) select name, amount+10, letter from \"Test\"");
        exec sql execute immediate :command;
        
	printf("Inserted %ld tuples via execute immediate\n", sqlca.sqlerrd[2]);

        strcpy(msg, "execute insert 4");
        sprintf(command, "insert into \"Test\" (name, amount, letter) select name, amount+?, letter from \"Test\"");
	exec sql prepare I from :command;
        exec sql at pm execute I using :increment;
        
	printf("Inserted %ld tuples via prepared execute\n", sqlca.sqlerrd[2]);

	strcpy(msg, "commit");
	exec sql commit;

	/* Start automatic transactioning for connection pm. */
	exec sql at pm set autocommit to on;
	exec sql at pm begin transaction;

        strcpy(msg, "select");
        exec sql select * into :name, :amount, :letter from "Test";

	printf("Database: mm\n");
        for (i=0, how_many=j=sqlca.sqlerrd[2]; i<j; i++)
	{
	    exec sql begin declare section;
	    char n[8], l = letter[i][0];
	    int a = amount[i];
	    exec sql end declare section;

	    strncpy(n, name[i], NAMELEN);
            printf("name[%d]=%8.8s\tamount[%d]=%d\tletter[%d]=%c\n", i, n, i, a, i, l);
	    amount[i]+=1000;

	    strcpy(msg, "insert");
	    exec sql at pm insert into "Test" (name, amount, letter) values (:n, :amount[i], :l);
	}

	strcpy(msg, "commit");
	exec sql at pm commit;

	sprintf (command, "select * from \"Test\"");

	exec sql prepare F from :command;
	exec sql declare CUR cursor for F;

	strcpy(msg, "open");
	exec sql open CUR;

	strcpy(msg, "fetch");
        exec sql fetch :how_many in CUR into :name, :amount, :letter;

	printf("Database: mm\n");
        for (i=0, j=sqlca.sqlerrd[2]; i<j; i++)
	{
	    exec sql begin declare section;
	    char n[8], l = letter[i][0];
	    int a = amount[i];
	    exec sql end declare section;

	    strncpy(n, name[i], 8);
            printf("name[%d]=%8.8s\tamount[%d]=%d\tletter[%d]=%c\n", i, n, i, a, i, l);
	}

	exec sql close CUR;
	
        strcpy(msg, "select");
        exec sql at :connection select name, amount, letter into :name, :amount, :letter from "Test";

	printf("Database: %s\n", connection);
        for (i=0, j=sqlca.sqlerrd[2]; i<j; i++)
            printf("name[%d]=%8.8s\tamount[%d]=%d\tletter[%d]=%c\n", i, name[i], i, amount[i],i, letter[i][0]);

	strcpy(msg, "commit");
	exec sql commit;

        strcpy(msg, "select");
        exec sql at pm select name, amount, letter into :name_letter:ind from "Test";

	printf("Database: pm\n");
        for (i=0, j=sqlca.sqlerrd[2]; i<j; i++)
            printf("name[%d]=%8.8s\tamount[%d]=%d\tletter[%d]=%c\n", i, name_letter[i].name, i, name_letter[i].amount,i, name_letter[i].letter);

	name_letter[4].amount=1407;
	strcpy(msg, "insert");
	exec sql insert into "Test" (name, amount, letter) values (:name_letter[4]);
	
        strcpy(msg, "select");
        exec sql select name, amount, letter into :name_letter[2] from "Test" where amount = 1407;

	printf("Database: mm\n");
        printf("name[2]=%8.8s\tamount[2]=%d\tletter[2]=%c\n", name_letter[2].name, name_letter[2].amount, name_letter[2].letter);

	/* Start automatic transactioning for connection main. */
	exec sql set autocommit to on;

	strcpy(msg, "drop");
	exec sql drop table "Test";
	exec sql at pm drop table "Test";

	strcpy(msg, "disconnect"); 
        exec sql disconnect main;
	exec sql disconnect pm;
        
	if (dbgs != NULL)
                fclose(dbgs);

	return (0);
}