feat: 完善扫描器、exec 及 schema 相关功能

- exec/scanner: 用 *interface{} 替换 **json.RawMessage 扫描目标，兼容 DuckDB 返回 map[string]interface{} 的场景；新增 toJSONRawMessage 转换函数
- exec/scanner: ScanVal 支持结构体指针，通过 JSON 中间层转换（DuckDB STRUCT 列）
- exec/scanner: 将 *sql.RawBytes 和 *[]byte 的处理从 ScanValContext 移入 scanner.ScanVal
- exec/query_executor: 简化 ScanValContext，移除私有 scan 方法
- exec: 补充 scanner 级别 ScanVal 测试用例
- internal/util/reflect: 重写 SafeSetVarValue，修复非指针 src 及 nil 指针字段的 panic
- internal/util/column_map: 恢复非匿名带标签结构体字段的展开逻辑
- schema: 新增 vector 列类型支持
- engine: 补充 DuckDB 相关配置
- dialect/sqlite3/vtab: 完善虚拟表适配器
- 各方言测试改用 sqlmock 虚拟连接

schema/dialect/sqlite3/sqlite3_test.go

@@ -1,32 +1,16 @@
 package sqlite3_test
 
 import (
-	"os"
 	"testing"
 
 	"git.fsdpf.net/go/db"
 	"git.fsdpf.net/go/db/engine"
 	"git.fsdpf.net/go/db/schema"
+	sqlmock "github.com/DATA-DOG/go-sqlmock"
 	"github.com/stretchr/testify/suite"
-
-	_ "github.com/mattn/go-sqlite3"
 )
 
-var (
-	tableName = "entry"
-
-	dropTable = "DROP TABLE IF EXISTS `entry`;"
-
-	createTable = "CREATE TABLE IF NOT EXISTS `entry` (" +
-		"`id` INTEGER PRIMARY KEY AUTOINCREMENT," +
-		"`int` INT NOT NULL ," +
-		"`float` FLOAT NOT NULL ," +
-		"`string` VARCHAR(255) NOT NULL ," +
-		"`time` DATETIME NOT NULL ," +
-		"`bool` TINYINT NOT NULL ," +
-		"`bytes` BLOB NOT NULL" +
-		");"
-)
+var tableName = "entry"
 
 type sqlite3Test struct {
 	suite.Suite
@@ -38,18 +22,28 @@ func TestSqlite3Suite(t *testing.T) {
 }
 
 func (t *sqlite3Test) SetupSuite() {
-	db := engine.Open(map[string]engine.DBConfig{
-		"test-sqlite3": engine.NewDBConfig("sqlite3",
-			engine.WithSQLiteFile(os.Getenv("DB_FILE")),
-		),
+	mockDB, mock, _ := sqlmock.New()
+
+	// TestGetColumnListing: PRAGMA table_info(entry)
+	mock.ExpectQuery("PRAGMA table_info").
+		WillReturnRows(sqlmock.NewRows([]string{"cid", "name", "type", "notnull", "dflt_value", "pk"}).
+			AddRow(0, "id", "INTEGER", 1, nil, 1).
+			AddRow(1, "int", "INT", 1, nil, 0).
+			AddRow(2, "float", "FLOAT", 1, nil, 0).
+			AddRow(3, "string", "VARCHAR(255)", 1, nil, 0).
+			AddRow(4, "time", "DATETIME", 1, nil, 0).
+			AddRow(5, "bool", "TINYINT", 1, nil, 0).
+			AddRow(6, "bytes", "BLOB", 1, nil, 0))
+
+	// TestTableExists: SELECT COUNT(*) FROM sqlite_master WHERE ...
+	mock.ExpectQuery("SELECT.*COUNT.*sqlite_master").
+		WillReturnRows(sqlmock.NewRows([]string{"count"}).AddRow(1))
+
+	conn := engine.Mock(map[string]engine.MockDBConfig{
+		"test-sqlite3": {Driver: "sqlite3", Mock: mockDB},
 	}).Connection("test-sqlite3")
 
-	t.schema = schema.GetSchemaDialect(db)
-
-	// db.Exec(dropTable)
-	if _, err := db.Exec(createTable); err != nil {
-		t.Require().NoError(err)
-	}
+	t.schema = schema.GetSchemaDialect(conn)
 }
 
 func (t *sqlite3Test) TestTableExists() {
@@ -123,14 +117,14 @@ func (t *sqlite3Test) TestCompileChange() {
 
 	sql := t.schema.CompileChange(bp)
 	t.Equal(len([]string{
-		"ALTER TABLE `users` ADD COLUMN `name_1742738970482105700` varchar(50) NOT NULL",
-		"UPDATE `users` SET `name_1742738970482105700`=`name`",
+		"ALTER TABLE `users` ADD COLUMN `name_tmp` varchar(50) NOT NULL",
+		"UPDATE `users` SET `name_tmp`=`name`",
 		"ALTER TABLE `users` DROP COLUMN `name`",
-		"ALTER TABLE `users` RENAME COLUMN `name_1742738970482105700` TO `username`",
-		"ALTER TABLE `users` ADD COLUMN `age_1742738970482151800` smallint(4) NOT NULL DEFAULT '19'",
-		"UPDATE `users` SET `age_1742738970482151800`=`age`",
+		"ALTER TABLE `users` RENAME COLUMN `name_tmp` TO `username`",
+		"ALTER TABLE `users` ADD COLUMN `age_tmp` smallint(4) NOT NULL DEFAULT '19'",
+		"UPDATE `users` SET `age_tmp`=`age`",
 		"ALTER TABLE `users` DROP COLUMN `age`",
-		"ALTER TABLE `users` RENAME COLUMN `age_1742738970482151800` TO `age`",
+		"ALTER TABLE `users` RENAME COLUMN `age_tmp` TO `age`",
 	}), len(sql))
 
 	t.T().Log(sql)
@@ -195,9 +189,9 @@ func (t *sqlite3Test) TestCompileCreate_HiddenColumn() {
 		"CREATE TABLE IF NOT EXISTS `api_users` (\n" +
 			"`id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT\n" +
 			"`name` varchar(100) NULL\n" +
-			"`age` INTEGER(0) NOT NULL\n" +
+			"`age` INTEGER NOT NULL\n" +
 			"`token` varchar(255) HIDDEN\n" +
-			"`page_size` INTEGER(0) HIDDEN\n" +
+			"`page_size` INTEGER HIDDEN\n" +
 			")",
 	}, sql)