sql read write support (#4976)

Co-authored-by: light.zhou <light.zhou@bkyo.io>

core/stores/sqlx/config.go

@@ -0,0 +1,29 @@
+package sqlx
+
+import "errors"
+
+var (
+	errEmptyDatasource = errors.New("empty datasource")
+	errEmptyDriverName = errors.New("empty driver name")
+)
+
+// SqlConf defines the configuration for sqlx.
+type SqlConf struct {
+	DataSource string
+	DriverName string   `json:",default=mysql"`
+	Replicas   []string `json:",optional"`
+	Policy     string   `json:",default=round-robin,options=round-robin|random"`
+}
+
+// Validate validates the SqlxConf.
+func (sc SqlConf) Validate() error {
+	if len(sc.DataSource) == 0 {
+		return errEmptyDatasource
+	}
+
+	if len(sc.DriverName) == 0 {
+		return errEmptyDriverName
+	}
+
+	return nil
+}