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statement.go
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statement.go
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package duckdb
/*
#include <duckdb.h>
*/
import "C"
import (
"database/sql/driver"
"errors"
"fmt"
"math/big"
"time"
"unsafe"
)
type stmt struct {
c *conn
stmt *C.duckdb_prepared_statement
closed bool
rows bool
}
func (s *stmt) Close() error {
if s.rows {
panic("database/sql/driver: misuse of duckdb driver: Close with active Rows")
}
if s.closed {
panic("database/sql/driver: misuse of duckdb driver: double Close of Stmt")
}
s.closed = true
C.duckdb_destroy_prepare(s.stmt)
return nil
}
func (s *stmt) NumInput() int {
if s.closed {
panic("database/sql/driver: misuse of duckdb driver: NumInput after Close")
}
paramCount := C.duckdb_nparams(*s.stmt)
return int(paramCount)
}
func (s *stmt) start(args []driver.Value) error {
if s.NumInput() != len(args) {
return fmt.Errorf("incorrect argument count for command: have %d want %d", len(args), s.NumInput())
}
for i, v := range args {
switch v := v.(type) {
case bool:
if rv := C.duckdb_bind_boolean(*s.stmt, C.idx_t(i+1), C.bool(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case int8:
if rv := C.duckdb_bind_int8(*s.stmt, C.idx_t(i+1), C.int8_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case int16:
if rv := C.duckdb_bind_int16(*s.stmt, C.idx_t(i+1), C.int16_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case int32:
if rv := C.duckdb_bind_int32(*s.stmt, C.idx_t(i+1), C.int32_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case int64:
if rv := C.duckdb_bind_int64(*s.stmt, C.idx_t(i+1), C.int64_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case int:
if rv := C.duckdb_bind_int64(*s.stmt, C.idx_t(i+1), C.int64_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case *big.Int:
val, err := hugeIntFromNative(v)
if err != nil {
return err
}
if rv := C.duckdb_bind_hugeint(*s.stmt, C.idx_t(i+1), val); rv == C.DuckDBError {
return errCouldNotBind
}
case uint8:
if rv := C.duckdb_bind_uint8(*s.stmt, C.idx_t(i+1), C.uchar(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case uint16:
if rv := C.duckdb_bind_uint16(*s.stmt, C.idx_t(i+1), C.uint16_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case uint32:
if rv := C.duckdb_bind_uint32(*s.stmt, C.idx_t(i+1), C.uint32_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case uint64:
if rv := C.duckdb_bind_uint64(*s.stmt, C.idx_t(i+1), C.uint64_t(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case float32:
if rv := C.duckdb_bind_float(*s.stmt, C.idx_t(i+1), C.float(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case float64:
if rv := C.duckdb_bind_double(*s.stmt, C.idx_t(i+1), C.double(v)); rv == C.DuckDBError {
return errCouldNotBind
}
case string:
val := C.CString(v)
if rv := C.duckdb_bind_varchar(*s.stmt, C.idx_t(i+1), val); rv == C.DuckDBError {
C.free(unsafe.Pointer(val))
return errCouldNotBind
}
C.free(unsafe.Pointer(val))
case []byte:
val := C.CBytes(v)
l := len(v)
if rv := C.duckdb_bind_blob(*s.stmt, C.idx_t(i+1), val, C.uint64_t(l)); rv == C.DuckDBError {
C.free(unsafe.Pointer(val))
return errCouldNotBind
}
C.free(unsafe.Pointer(val))
case time.Time:
val := C.duckdb_timestamp{
micros: C.int64_t(v.UTC().UnixMicro()),
}
if rv := C.duckdb_bind_timestamp(*s.stmt, C.idx_t(i+1), val); rv == C.DuckDBError {
return errCouldNotBind
}
case Interval:
val := C.duckdb_interval{
months: C.int32_t(v.Months),
days: C.int32_t(v.Days),
micros: C.int64_t(v.Micros),
}
if rv := C.duckdb_bind_interval(*s.stmt, C.idx_t(i+1), val); rv == C.DuckDBError {
return errCouldNotBind
}
case nil:
if rv := C.duckdb_bind_null(*s.stmt, C.idx_t(i+1)); rv == C.DuckDBError {
return errCouldNotBind
}
default:
return driver.ErrSkip
}
}
return nil
}
func (s *stmt) Exec(args []driver.Value) (driver.Result, error) {
if s.closed {
panic("database/sql/driver: misuse of duckdb driver: Exec after Close")
}
if s.rows {
panic("database/sql/driver: misuse of duckdb driver: Exec with active Rows")
}
err := s.start(args)
if err != nil {
return nil, err
}
var res C.duckdb_result
if state := C.duckdb_execute_prepared(*s.stmt, &res); state == C.DuckDBError {
dbErr := C.GoString(C.duckdb_result_error(&res))
C.duckdb_destroy_result(&res)
C.duckdb_destroy_prepare(s.stmt)
return nil, errors.New(dbErr)
}
defer C.duckdb_destroy_result(&res)
ra := int64(C.duckdb_value_int64(&res, 0, 0))
return &result{ra}, nil
}
func (s *stmt) Query(args []driver.Value) (driver.Rows, error) {
if s.closed {
panic("database/sql/driver: misuse of duckdb driver: Query after Close")
}
if s.rows {
panic("database/sql/driver: misuse of duckdb driver: Query with active Rows")
}
err := s.start(args)
if err != nil {
return nil, err
}
var res C.duckdb_result
if state := C.duckdb_execute_prepared(*s.stmt, &res); state == C.DuckDBError {
dbErr := C.GoString(C.duckdb_result_error(&res))
C.duckdb_destroy_result(&res)
C.duckdb_destroy_prepare(s.stmt)
return nil, errors.New(dbErr)
}
s.rows = true
return newRowsWithStmt(res, s), nil
}
var (
errCouldNotBind = errors.New("could not bind parameter")
)