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Function PQexec(PGconn *conn, const char *command) PQexecParams(PGconn *conn, const char *command, int nParams, const Oid *paramTypes, const char *paramValues, const int *paramLengths, const int *paramFormats, int resultFormat)
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Description Submits a string command to the server and wait for the result Submits a command that includes parameters to the server and wait for the result The parameters are defined, along with lengths and formats, in the other parameters This command also specifies the result format (0 for text or 1 for binary)
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PQprepare(PGconn *conn, const char Submits a command query to be prepared *name, const char *query, int nParams, on the server using connection conn The const Oid *paramTypes) command may use parameters, defined in the PQexecPrepared() function The prepared statement is referenced by name PQexecPrepared(Pgconn *conn, const char *name, int nParms, const char *paramValues, const int paramLengths, const int paramFormats, int resultFormat) PQresultStatus(Pgresult *result) Submits a request to execute a previously prepared statement name You may specify parameters and the result format (0 for text or 1 for binary) Returns the result status of an executed command
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PQresStatus(ExecStatuwsType status) Returns a string result status given a PQresultStatus value PQresultErrorMessage(PGresult *result) PQclear(PGresult *result) Returns an error message string from an executed command, or a NULL value if no error occurred Clears (frees) the storage memory of result status result
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Table 14-4 libpq Command Execution Functions
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PGRES_EMPTY_QUERY The command sent was empty PGRES_BAD_RESPONSE The response from the server could not be understood PGRES_NONFATAL_ERROR The server generated a notice or a warning PGRES_FATAL_ERROR The server generated a fatal error message
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These values are defined in the libpq library and can be directly checked in your code:
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PGresult *result; result = PQexec(conn, "SELECT lastname from auctionbidder"); if (PQresultStatus(result) != PGRES_TUPLES_OK) {
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If the result returned by the command is a result set, there are several helper functions that can be used to determine what the returned data looks like, and how to handle it These functions are listed and described in Table 14-5 These functions are invaluable in sorting through the result set data returned within the PGresult object The way your program handles the result set data depends on what type of data (if any) is returned The following sections demonstrate how to handle different types of data returned from executing SQL commands in libpq
Function PQntuples(PGresult *res) PQnfields(PGresult *res)
Description Returns the number of records (tuples) in a result set res Returns the number of columns (fields) in a result set res
PQfname(PGresult *res, int column) Returns a column name given a result set res and a column number column PQfnumber(PGresult *res, const char *colname) Returns a column number given a result set res and a column name colname
PQftable(PGresult *res, int column) Returns the OID of the table a given column column was fetched from PQgetvalue(PGresult *res, int rec, int column) Returns the value of column column of a single record rec in result set res
PQgetisnull(PGresult *res, int rec, intTests if a value in column column of record rec column) in result set res is NULL Returns 1 if the value is NULL, and 0 if it is not PQgetlength(PGresult *res, int rec, int column) Returns the length (bytes) of a value in column column in record rec in a result set res
Table 14-5 libpq Command Result Information Functions
14:
Visual C++
Commands Returning No Data
SQL commands such as INSERT, UPDATE, and DELETE do not return data, but rather return a status code indicating whether or not the command succeeded In these situations, you must check for the PGRES_COMMAND_OK status in the result, since there are no tuples (records) returned The updatec program demonstrates this principle:
#include <stdioh> #include <stdlibh> #include "libpq-feh" int main(int argc, char **argv) { const char *conninfo; PGconn *conn; PGresult *result; char *insertcomm; conninfo = "hostaddr = 127001 dbname = test user = earl password = auction"; conn = PQconnectdb(conninfo); if (PQstatus(conn) != CONNECTION_OK) { printf("Unable to establish connection: %s", PQerrorMessage(conn)); return 1; } else { insertcomm = "INSERT into auctionbidder values (125, 'Test', 'Another', NULL, NULL, NULL, NULL, '555-2121')"; result = PQexec(conn, insertcomm); if (PQresultStatus(result) != PGRES_COMMAND_OK) { printf("Problem with command: %s\n", PQerrorMessage(conn)); PQclear(result); PQfinish(conn); return 1; } PQclear(result); } PQfinish(conn); return 0; }
The updatec program establishes a connection to the test database on the PostgreSQL server running on the local system, using the earl Login Role After the connection is established, a simple INSERT SQL command is executed on the server using the PQexec() function The status of the command is checked using the PQresultStatus() function and the PGRES_COMMAND_OK value If the status is not OK, the PQerrorMessage() function is used to display the error message generated by the server Finally, the
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