aboutsummaryrefslogtreecommitdiff
path: root/src/postgresql.cpp
blob: f2d42be8dc00419a4c16dba663f130d5cfacca78 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
    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);
}