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/postgres/postgres.go

@@ -45,7 +45,7 @@ func (this Postgres) CompileCreate(bp *schema.Blueprint) []string {
 		temporary = db.L("CREATE TEMPORARY")
 	}
 	columns := strings.Join(this.getAddedColumns(bp), ",\n")
-	sql := this.GenerateSQL("? TABLE ? (\n?\n)", temporary, db.T(bp.GetTable()), db.L(columns))
+	sql := this.GenerateSQL("? TABLE IF NOT EXISTS ? (\n?\n)", temporary, db.T(bp.GetTable()), db.L(columns))
 	return []string{sql}
 }
 
@@ -144,6 +144,8 @@ func (this Postgres) GetColumnType(column *schema.ColumnDefinition) string {
 		return "integer"
 	case "uuid":
 		return "uuid"
+	case "vector":
+		return this.GenerateSQL("vector(?)", column.Length)
 	}
 	panic("Unsupported data type: " + column.Type)
 }
@@ -156,16 +158,14 @@ func (this Postgres) GetColumnModifier(modifier string, bp *schema.Blueprint, co
 		}
 		return " NOT NULL"
 	case "Default":
+		if column.IsUseCurrent() {
+			// PostgreSQL 不支持 ON UPDATE，忽略 def 中可能携带的 MySQL ON UPDATE 标记
+			return " DEFAULT CURRENT_TIMESTAMP"
+		}
 		v := column.GetDefault()
 		if v == nil {
-			if column.IsUseCurrent() {
-				return " DEFAULT CURRENT_TIMESTAMP"
-			}
 			return ""
 		}
-		if column.IsUseCurrent() {
-			return this.GenerateSQL(" DEFAULT CURRENT_TIMESTAMP ?", v)
-		}
 		return this.GenerateSQL(" DEFAULT ?", v)
 	case "Increment":
 		if column.IsAutoIncrement() {

schema/dialect/postgres/postgres_test.go

@@ -1,14 +1,12 @@
 package postgres_test
 
 import (
-	"os"
 	"testing"
 
 	"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/lib/pq"
 )
 
 type postgresTest struct {
@@ -16,41 +14,27 @@ type postgresTest struct {
 	schema schema.Schema
 }
 
-var (
-	tableName = "entry"
-
-	dropTable = "DROP TABLE IF EXISTS entry;"
-
-	createTable = "CREATE TABLE IF NOT EXISTS entry (" +
-		"id SERIAL PRIMARY KEY," +
-		"int INTEGER NOT NULL UNIQUE," +
-		"float REAL NOT NULL," +
-		"string VARCHAR(255) NOT NULL," +
-		"time TIMESTAMP NOT NULL," +
-		"bool BOOLEAN NOT NULL," +
-		"bytes BYTEA NOT NULL" +
-		");"
-)
+var tableName = "entry"
 
 func TestPostgresSuite(t *testing.T) {
 	suite.Run(t, new(postgresTest))
 }
 
 func (t *postgresTest) SetupSuite() {
-	db := engine.Open(map[string]engine.DBConfig{
-		"test-postgres": engine.NewDBConfig("postgres",
-			engine.WithHost(os.Getenv("POSTGRES_HOST")),
-			engine.WithPort(os.Getenv("POSTGRES_PORT")),
-			engine.WithDatabase(os.Getenv("POSTGRES_DB")),
-			engine.WithUsername(os.Getenv("POSTGRES_USER")),
-			engine.WithPassword(os.Getenv("POSTGRES_PASSWD")),
-		),
+	mockDB, mock, _ := sqlmock.New()
+
+	mock.ExpectQuery("SELECT.*column_name.*columns").
+		WillReturnRows(sqlmock.NewRows([]string{"column_name"}).
+			AddRow("id").AddRow("int").AddRow("float").
+			AddRow("string").AddRow("time").AddRow("bool").AddRow("bytes"))
+
+	mock.ExpectQuery("SELECT.*COUNT.*tables").
+		WillReturnRows(sqlmock.NewRows([]string{"count"}).AddRow(1))
+
+	conn := engine.Mock(map[string]engine.MockDBConfig{
+		"test-postgres": {Driver: "postgres", Mock: mockDB},
 	}).Connection("test-postgres")
-
-	t.schema = schema.GetSchemaDialect(db)
-
-	db.Exec(dropTable)
-	db.Exec(createTable)
+	t.schema = schema.GetSchemaDialect(conn)
 }
 
 func (t *postgresTest) TestGetColumnListing() {
@@ -80,14 +64,14 @@ func (t *postgresTest) TestCompileCreate() {
 	sql := t.schema.CompileCreate(bp)
 
 	t.Equal([]string{
-		"CREATE TABLE \"users\" (\n" +
-			"\"id\" bigint NOT NULL BIGSERIAL PRIMARY KEY COMMENT 'ID',\n" +
-			"\"enabled\" boolean NOT NULL DEFAULT true COMMENT '是否有效',\n" +
-			"\"created_user\" char(36) NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000' COMMENT '创建者',\n" +
-			"\"owned_user\" char(36) NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000' COMMENT '拥有者',\n" +
-			"\"created_at\" timestamp with time zone NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',\n" +
-			"\"updated_at\" timestamp with time zone NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '更新时间',\n" +
-			"\"deleted_at\" timestamp without time zone NULL COMMENT '删除时间'\n" +
+		"CREATE TABLE IF NOT EXISTS \"users\" (\n" +
+			"\"id\" bigint NOT NULL BIGSERIAL PRIMARY KEY,\n" +
+			"\"enabled\" boolean NOT NULL DEFAULT 'true',\n" +
+			"\"created_user\" char(36) NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000',\n" +
+			"\"owned_user\" char(36) NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000',\n" +
+			"\"created_at\" timestamp with time zone NOT NULL DEFAULT CURRENT_TIMESTAMP,\n" +
+			"\"updated_at\" timestamp with time zone NOT NULL DEFAULT CURRENT_TIMESTAMP,\n" +
+			"\"deleted_at\" timestamp without time zone NULL\n" +
 			")",
 	}, sql)
 
@@ -105,9 +89,9 @@ func (t *postgresTest) TestCompileAdd() {
 
 	t.Equal([]string{
 		"ALTER TABLE \"users\"\n" +
-			"ADD COLUMN \"name\" varchar(50) NOT NULL COMMENT '用户名',\n" +
-			"ADD COLUMN \"age\" smallint NOT NULL DEFAULT 18 COMMENT '年龄',\n" +
-			"ADD COLUMN \"sex\" varchar(1) NOT NULL DEFAULT '0' COMMENT '性别'",
+			"ADD COLUMN \"name\" varchar(50) NOT NULL,\n" +
+			"ADD COLUMN \"age\" smallint NOT NULL DEFAULT '18',\n" +
+			"ADD COLUMN \"sex\" varchar(1) NOT NULL DEFAULT '0'",
 	}, sql)
 
 	t.T().Log(sql)
@@ -124,7 +108,7 @@ func (t *postgresTest) TestCompileChange() {
 	t.Equal([]string{
 		"ALTER TABLE \"users\"\n" +
 			"ALTER COLUMN \"name\" TYPE varchar(50) NOT NULL,\n" +
-			"ALTER COLUMN \"age\" TYPE smallint NOT NULL DEFAULT 19 COMMENT '年龄'",
+			"ALTER COLUMN \"age\" TYPE smallint NOT NULL DEFAULT '19'",
 	}, sql)
 
 	t.T().Log(sql)