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conn_sp.go
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/
conn_sp.go
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package freetds
import (
"errors"
"fmt"
"unsafe"
)
/*
#cgo LDFLAGS: -lsybdb
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <libgen.h>
#include <sybfront.h>
#include <sybdb.h>
*/
import "C"
//Execute stored procedure by name and list of params.
//
//Example:
// conn.ExecSp("sp_help", "authors")
func (conn *Conn) ExecSp(spName string, params ...interface{}) (*SpResult, error) {
if conn.isDead() || conn.isMirrorSlave() {
if err := conn.reconnect(); err != nil {
return nil, err
}
}
//hold references to data sent to the C code until the end of this function
//without this GC could remove something used later in C, and we will get SIGSEG
refHolder := make([]*[]byte, 0)
conn.clearMessages()
name := C.CString(spName)
defer C.free(unsafe.Pointer(name))
if C.dbrpcinit(conn.dbproc, name, 0) == C.FAIL {
return nil, conn.raiseError("dbrpcinit failed")
}
//input params
spParams, err := conn.getSpParams(spName)
if err != nil {
return nil, err
}
for i, spParam := range spParams {
//get datavalue for the suplied stored procedure parameter
var datavalue *C.BYTE
datalen := 0
if i < len(params) {
param := params[i]
if param != nil {
data, sqlDatalen, err := typeToSqlBuf(int(spParam.UserTypeId), param, conn.freetdsVersionGte095)
if err != nil {
conn.close() //hard close the connection, if pooled don't return it.
return nil, err
}
if len(data) > 0 {
datalen = sqlDatalen
datavalue = (*C.BYTE)(unsafe.Pointer(&data[0]))
refHolder = append(refHolder, &data)
}
}
}
//set parametar valus, call dbrpcparam
if i < len(params) || spParam.IsOutput {
maxOutputSize := C.DBINT(-1)
status := C.BYTE(0)
if spParam.IsOutput {
status = C.DBRPCRETURN
maxOutputSize = C.DBINT(spParam.MaxLength)
if maxOutputSize == -1 {
maxOutputSize = 8000
}
}
paramname := C.CString(spParam.Name)
defer C.free(unsafe.Pointer(paramname))
if C.dbrpcparam(conn.dbproc, paramname, status,
C.int(spParam.UserTypeId), maxOutputSize, C.DBINT(datalen), datavalue) == C.FAIL {
return nil, errors.New("dbrpcparam failed")
}
}
}
//execute
if C.dbrpcsend(conn.dbproc) == C.FAIL {
return nil, conn.raiseError("dbrpcsend failed")
}
//results
result := NewSpResult()
result.results, err = conn.fetchResults()
if err != nil {
return nil, conn.raise(err)
}
//return status
if C.dbhasretstat(conn.dbproc) == C.TRUE {
result.status = int(C.dbretstatus(conn.dbproc))
}
//read output params
numOutParams := int(C.dbnumrets(conn.dbproc))
result.outputParams = make([]*SpOutputParam, numOutParams)
for i := 1; i <= numOutParams; i++ {
j := C.int(i)
len := C.dbretlen(conn.dbproc, j)
name := C.GoString(C.dbretname(conn.dbproc, j))
typ := int(C.dbrettype(conn.dbproc, j))
data := C.GoBytes(unsafe.Pointer(C.dbretdata(conn.dbproc, j)), len)
value := sqlBufToType(typ, data)
param := &SpOutputParam{Name: name, Value: value}
result.outputParams[i-1] = param
}
return result, nil
}
func (conn *Conn) raise(err error) error {
if len(conn.Error) != 0 {
return errors.New(fmt.Sprintf("%s\n%s", conn.Error, conn.Message))
}
return err
}
func (conn *Conn) raiseError(errMsg string) error {
return conn.raise(errors.New(errMsg))
}
// func toRpcParam(datatype int, value interface{}) (datalen C.DBINT, datavalue *C.BYTE, err error) {
// data, err := typeToSqlBuf(datatype, value)
// if err != nil {
// return
// }
// datalen = C.DBINT(len(data))
// if len(data) > 0 {
// datavalue = (*C.BYTE)(unsafe.Pointer(&data[0]))
// }
// //fmt.Printf("\ndatavalue: %v, datalen: %v, data: %v %s\n", datavalue, datalen, data, data)
// return
// }
//Stored procedure parameter definition
type spParam struct {
Name string
ParameterId int32
UserTypeId int32
IsOutput bool
MaxLength int16
Precision uint8
Scale uint8
}
//Read stored procedure parameters.
//Will cache params in connection or pool and reuse it.
func (conn *Conn) getSpParams(spName string) ([]*spParam, error) {
if spParams, ok := conn.spParamsCache.Get(spName); ok {
return spParams, nil
}
sql := conn.getSpParamsSql(spName)
results, err := conn.exec(sql)
if err != nil {
return nil, err
}
r := results[0]
spParams := make([]*spParam, len(r.Rows))
for i := 0; r.Next(); i++ {
p := &spParam{}
err := r.Scan(&p.Name, &p.ParameterId, &p.UserTypeId, &p.IsOutput, &p.MaxLength, &p.Precision, &p.Scale)
//fixme: mapping uniqueidentifier, datetimeoffset, date, time, datetime2 to string
if p.UserTypeId == 0x24 || p.UserTypeId == 0x2B || p.UserTypeId == 0x28 || p.UserTypeId == 0x29 || p.UserTypeId == 0x2A {
p.UserTypeId = 0x27
}
if err != nil {
return nil, err
}
spParams[i] = p
}
conn.spParamsCache.Set(spName, spParams)
return spParams, nil
}
const msSqlGetSpParamsSql string = `
select name, parameter_id, user_type_id, is_output, max_length, precision, scale
from sys.all_parameters
where object_id = (select object_id from sys.all_objects where object_id = object_id('%s'))
order by parameter_id
`
const sybaseAseGetSpParamsSql string = `
select name = c.name,
parameter_id = c.id,
user_type_id = c.type,
is_output = case
when c.status2 = 2 or c.status2 = 4 then 1
else 0
end,
max_length = c.length,
precision = isnull(c.prec,0),
scale = isnull(c.scale,0)
from sysobjects o
join syscolumns c
on c.id = o.id
where o.name = '%s'
order by c.id
`
func (conn *Conn) getSpParamsSql(spName string) string {
if conn.credentials.compatibility == SYBASE {
return fmt.Sprintf(sybaseAseGetSpParamsSql, spName)
}
return fmt.Sprintf(msSqlGetSpParamsSql, spName)
}