Squashed 'backend/go-sqlite3/' content from commit 20826e8

git-subtree-dir: backend/go-sqlite3
git-subtree-split: 20826e87d8f061d0a7266562f43950ee06e2e9c0

sqlite3_type.go

@@ -0,0 +1,108 @@
+// 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(any))
+}
+
+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
+}