go-sqlite3-hak5/sqlite3_type.go

109 lines
2.4 KiB
Go

// Copyright (C) 2019 Yasuhiro Matsumoto <mattn.jp@gmail.com>.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package sqlite3
/*
#ifndef USE_LIBSQLITE3
#include "sqlite3-binding.h"
#else
#include <sqlite3.h>
#endif
*/
import "C"
import (
"database/sql"
"reflect"
"strings"
)
// ColumnTypeDatabaseTypeName implement RowsColumnTypeDatabaseTypeName.
func (rc *SQLiteRows) ColumnTypeDatabaseTypeName(i int) string {
return C.GoString(C.sqlite3_column_decltype(rc.s.s, C.int(i)))
}
/*
func (rc *SQLiteRows) ColumnTypeLength(index int) (length int64, ok bool) {
return 0, false
}
func (rc *SQLiteRows) ColumnTypePrecisionScale(index int) (precision, scale int64, ok bool) {
return 0, 0, false
}
*/
// ColumnTypeNullable implement RowsColumnTypeNullable.
func (rc *SQLiteRows) ColumnTypeNullable(i int) (nullable, ok bool) {
return true, true
}
// ColumnTypeScanType implement RowsColumnTypeScanType.
func (rc *SQLiteRows) ColumnTypeScanType(i int) reflect.Type {
//ct := C.sqlite3_column_type(rc.s.s, C.int(i)) // Always returns 5
return scanType(C.GoString(C.sqlite3_column_decltype(rc.s.s, C.int(i))))
}
const (
SQLITE_INTEGER = iota
SQLITE_TEXT
SQLITE_BLOB
SQLITE_REAL
SQLITE_NUMERIC
SQLITE_TIME
SQLITE_BOOL
SQLITE_NULL
)
func scanType(cdt string) reflect.Type {
t := strings.ToUpper(cdt)
i := databaseTypeConvSqlite(t)
switch i {
case SQLITE_INTEGER:
return reflect.TypeOf(sql.NullInt64{})
case SQLITE_TEXT:
return reflect.TypeOf(sql.NullString{})
case SQLITE_BLOB:
return reflect.TypeOf(sql.RawBytes{})
case SQLITE_REAL:
return reflect.TypeOf(sql.NullFloat64{})
case SQLITE_NUMERIC:
return reflect.TypeOf(sql.NullFloat64{})
case SQLITE_BOOL:
return reflect.TypeOf(sql.NullBool{})
case SQLITE_TIME:
return reflect.TypeOf(sql.NullTime{})
}
return reflect.TypeOf(new(interface{}))
}
func databaseTypeConvSqlite(t string) int {
if strings.Contains(t, "INT") {
return SQLITE_INTEGER
}
if t == "CLOB" || t == "TEXT" ||
strings.Contains(t, "CHAR") {
return SQLITE_TEXT
}
if t == "BLOB" {
return SQLITE_BLOB
}
if t == "REAL" || t == "FLOAT" ||
strings.Contains(t, "DOUBLE") {
return SQLITE_REAL
}
if t == "DATE" || t == "DATETIME" ||
t == "TIMESTAMP" {
return SQLITE_TIME
}
if t == "NUMERIC" ||
strings.Contains(t, "DECIMAL") {
return SQLITE_NUMERIC
}
if t == "BOOLEAN" {
return SQLITE_BOOL
}
return SQLITE_NULL
}