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/*
postgresql.cpp
Copyright (C) 2019 Richard Knight
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <plugin.h>
#include <iostream>
#include "libpq-fe.h"
#include "connection.h"
#include "postgresql.h"
void PostgresConnection::Init(csnd::Csound* csound, LoginData* login) {
char connectionString[256];
snprintf(connectionString, 256,
"dbname=%s user=%s password=%s hostaddr=%s",
login->dbName, login->dbUser, login->dbPass, login->dbHost
);
conn = PQconnectdb(connectionString);
if (PQstatus(conn) == CONNECTION_BAD) {
throw std::runtime_error("Connection not open");
}
}
void PostgresConnection::Close(csnd::Csound* csound) {
PQfinish(conn);
}
void PostgresConnection::Exec(char* sql) {
PGresult* result = PQexec(conn, sql);
PQclear(result);
}
PGresult* PostgresConnection::Query(char* sql) {
return PQexec(conn, sql);
}
MYFLT PostgresConnection::Scalar(char* sql, int row, int col) {
PGresult* result = Query(sql);
int rows = PQntuples(result);
int cols = PQnfields(result);
if (row > rows - 1) {
throw std::runtime_error("row number out of range");
}
if (col > cols - 1) {
throw std::runtime_error("column number out of range");
}
MYFLT value = (MYFLT) atof(PQgetvalue(result, row, col));
PQclear(result);
return value;
}
char* PostgresConnection::ScalarString(char* sql, int row, int col) {
PGresult* result = Query(sql);
int rows = PQntuples(result);
int cols = PQnfields(result);
if (row > rows - 1) {
throw std::runtime_error("row number out of range");
}
if (col > cols -1) {
throw std::runtime_error("column number out of range");
}
char* value = (char*) PQgetvalue(result, row, col);
PQclear(result);
return value;
}
void PostgresConnection::ToArray(PGresult* result, csnd::Csound* csound, ARRAYDAT* array, bool asString) {
int rows = PQntuples(result);
int cols = PQnfields(result);
int totalResults = rows * cols;
array->sizes = csound->calloc(sizeof(int32_t) * 2);
array->sizes[0] = rows;
array->sizes[1] = cols;
array->dimensions = 2;
CS_VARIABLE *var = array->arrayType->createVariable(csound, NULL);
array->arrayMemberSize = var->memBlockSize;
array->data = (MYFLT*) csound->calloc(var->memBlockSize * totalResults);
STRINGDAT* strings;
if (asString) {
strings = (STRINGDAT*) array->data;
}
int index = 0;
for (int rowNum = 0; rowNum < rows; ++rowNum) {
for (int colNum = 0; colNum < cols; ++colNum) {
if (asString) {
char* item = (char*) PQgetvalue(result, rowNum, colNum);
strings[index].size = strlen(item) + 1;
strings[index].data = csound->strdup(item);
} else {
array->data[index] = (MYFLT) atof(PQgetvalue(result, rowNum, colNum));
}
index++;
}
}
PQclear(result);
}
void PostgresConnection::ArrayQueryString(char* sql, csnd::Csound* csound, ARRAYDAT* array) {
ToArray(Query(sql), csound, array, true);
}
void PostgresConnection::ArrayQuery(char* sql, csnd::Csound* csound, ARRAYDAT* array) {
ToArray(Query(sql), csound, array, false);
}
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