General Bug Report: Documentation problem

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Dan Merillat
Your email address : Dan(at)merillat(dot)org

Category : install: other
Severity : non-critical

Summary: Documentation problem

System Configuration
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Operating System : N/A

PostgreSQL version : 6.3

Compiler used : N/A

Hardware:
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N/A

Versions of other tools:
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N/A

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Problem Description:
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libpq documentation has a few errors. Most notably, the reccomended style of error handling.
psuedocode: res=PQexec(conn, "error-prone-statement"); if (PQresultStatus(res) != PGRES_TUPLES_OK) { do_error_code(); }
This is actually incorrect, since on error, PQexec returns null, so PQresultStatus (which I can't find documented) derefrences a null pointer.
Correct example code would be res=PQexec(conn, "error-prone-statment"); if (!res) { printf("PQexec(): %s\n", PQerrorMessage(conn)); exit(1) }

If nobody else is working on the documentation reply to me, and I'll submit diffs.

--Dan

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Test Case:
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Solution:
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