Class: Swift::DB::Postgres::Statement

Inherits:
Object
  • Object
show all
Defined in:
ext/swift/db/postgres/statement.c

Instance Method Summary collapse

Constructor Details

#initialize(adapter, sql) ⇒ Object 



56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
 
# File 'ext/swift/db/postgres/statement.c', line 56

VALUE db_postgres_statement_initialize(VALUE self, VALUE adapter, VALUE sql) {
    PGresult *result;
    Statement *s = db_postgres_statement_handle(self);
    Adapter *a   = db_postgres_adapter_handle_safe(adapter);

    snprintf(s->id, 128, "s%s", CSTRING(rb_uuid_string()));
    s->adapter = adapter;

    if (!a->native)
        sql = db_postgres_normalized_sql(sql);

    result = PQprepare(a->connection, s->id, CSTRING(sql), 0, 0);
    db_postgres_check_result(result);
    PQclear(result);
    return self;
}

Instance Method Details

#execute(*args) ⇒ Object 



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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
 
# File 'ext/swift/db/postgres/statement.c', line 98

VALUE db_postgres_statement_execute(int argc, VALUE *argv, VALUE self) {
    PGresult *result;
    PGconn *connection;
    char **bind_args_data = 0;
    int n, *bind_args_size = 0, *bind_args_fmt = 0;
    VALUE bind, data, typecast_bind;

    Statement *s = db_postgres_statement_handle_safe(self);
    connection   = db_postgres_adapter_handle_safe(s->adapter)->connection;

    rb_scan_args(argc, argv, "00*", &bind);

    typecast_bind = rb_ary_new();
    rb_gc_register_address(&typecast_bind);
    rb_gc_register_address(&bind);

    if (RARRAY_LEN(bind) > 0) {
        bind_args_size = (int   *) malloc(sizeof(int)    * RARRAY_LEN(bind));
        bind_args_fmt  = (int   *) malloc(sizeof(int)    * RARRAY_LEN(bind));
        bind_args_data = (char **) malloc(sizeof(char *) * RARRAY_LEN(bind));

        for (n = 0; n < RARRAY_LEN(bind); n++) {
            data = rb_ary_entry(bind, n);
            if (NIL_P(data)) {
                bind_args_size[n] = 0;
                bind_args_data[n] = 0;
                bind_args_fmt[n]  = 0;
            }
            else {
                if (rb_obj_is_kind_of(data, rb_cIO) || rb_obj_is_kind_of(data, cStringIO))
                    bind_args_fmt[n] = 1;
                else
                    bind_args_fmt[n] = 0;
                data = typecast_to_string(data);
                rb_ary_push(typecast_bind, data);
                bind_args_size[n] = RSTRING_LEN(data);
                bind_args_data[n] = RSTRING_PTR(data);
            }
        }

        Query q = {
            .connection = connection,
            .command    = s->id,
            .n_args     = RARRAY_LEN(bind),
            .data       = bind_args_data,
            .size       = bind_args_size,
            .format     = bind_args_fmt
        };

        result = (PGresult *)GVL_NOLOCK(nogvl_pq_exec_prepared, &q, RUBY_UBF_IO, 0);
        free(bind_args_fmt);
        free(bind_args_size);
        free(bind_args_data);
    }
    else {
        Query q = {
            .connection = connection,
            .command    = s->id,
            .n_args     = 0,
            .data       = 0,
            .size       = 0,
            .format     = 0
        };
        result = (PGresult *)GVL_NOLOCK(nogvl_pq_exec_prepared, &q, RUBY_UBF_IO, 0);
    }

    rb_gc_unregister_address(&typecast_bind);
    rb_gc_unregister_address(&bind);
    db_postgres_check_result(result);
    return db_postgres_result_load(db_postgres_result_allocate(cDPR), result);
}

#release ⇒ Object 



73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'ext/swift/db/postgres/statement.c', line 73

VALUE db_postgres_statement_release(VALUE self) {
    char command[256];
    PGresult *result;
    PGconn *connection;

    Statement *s = db_postgres_statement_handle_safe(self);
    connection   = db_postgres_adapter_handle_safe(s->adapter)->connection;

    if (connection && PQstatus(connection) == CONNECTION_OK) {
        snprintf(command, 256, "deallocate %s", s->id);
        result = PQexec(connection, command);
        db_postgres_check_result(result);
        PQclear(result);
        return Qtrue;
    }

    return Qfalse;
}