优化结构

internal/data/system/export_value_test.go

@@ -0,0 +1,18 @@
+package system
+
+import "testing"
+
+func TestExportQueryValueUsesDatabaseType(t *testing.T) {
+	if value := exportQueryValue([]byte("42"), "VARCHAR"); value != "42" {
+		t.Fatalf("text value = %#v, want string 42", value)
+	}
+	if value, ok := exportQueryValue([]byte("42"), "BIGINT").(int64); !ok || value != 42 {
+		t.Fatalf("integer value = %#v", exportQueryValue([]byte("42"), "BIGINT"))
+	}
+	if value, ok := exportQueryValue([]byte("12.5"), "DECIMAL").(float64); !ok || value != 12.5 {
+		t.Fatalf("decimal value = %#v", exportQueryValue([]byte("12.5"), "DECIMAL"))
+	}
+	if value, ok := exportQueryValue([]byte("1234567890123456.78"), "DECIMAL").(string); !ok || value != "1234567890123456.78" {
+		t.Fatalf("high-precision decimal value = %#v", exportQueryValue([]byte("1234567890123456.78"), "DECIMAL"))
+	}
+}