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code/allapp/allapp-go-v3/pkg/db/db.go

@@ -0,0 +1,42 @@
+package db
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+var defaultClient *Client
+
+type Executor interface {
+	Exec(ctx context.Context, sql string, args ...any) (pgconn.CommandTag, error)
+	Query(ctx context.Context, sql string, args ...any) (pgx.Rows, error)
+	QueryRow(ctx context.Context, sql string, args ...any) pgx.Row
+}
+
+type Client struct {
+	pool *pgxpool.Pool
+	tx   pgx.Tx
+}
+
+// Init 初始化
+func Init(pool *pgxpool.Pool) {
+	defaultClient = &Client{pool: pool}
+}
+
+// New 创建会话
+func New() *Client {
+	return &Client{
+		pool: defaultClient.pool,
+	}
+}
+
+// 内部获取执行器（关键）
+func (c *Client) exec() Executor {
+	if c.tx != nil {
+		return c.tx
+	}
+	return c.pool
+}