20260507213409

code/app/app-go/pkg/db/db.go

@@ -0,0 +1,50 @@
+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 Client struct {
+	pool *pgxpool.Pool
+	tx   pgx.Tx
+}
+
+// Init 初始化（只调用一次）
+func Init(pool *pgxpool.Pool) {
+	defaultClient = &Client{pool: pool}
+}
+
+// New 获取全局 client
+func New() *Client {
+	if defaultClient == nil {
+		panic("db not initialized, call db.Init(pool) first")
+	}
+	return defaultClient
+}
+
+func (c *Client) Exec(ctx context.Context, sql string, args ...any) (pgconn.CommandTag, error) {
+	if c.tx != nil {
+		return c.tx.Exec(ctx, sql, args...)
+	}
+	return c.pool.Exec(ctx, sql, args...)
+}
+
+func (c *Client) Query(ctx context.Context, sql string, args ...any) (pgx.Rows, error) {
+	if c.tx != nil {
+		return c.tx.Query(ctx, sql, args...)
+	}
+	return c.pool.Query(ctx, sql, args...)
+}
+
+func (c *Client) QueryRow(ctx context.Context, sql string, args ...any) pgx.Row {
+	if c.tx != nil {
+		return c.tx.QueryRow(ctx, sql, args...)
+	}
+	return c.pool.QueryRow(ctx, sql, args...)
+}