improve dry-run feature by adding global dry-run variable reading from environment or command options

database/gdb/gdb.go

@@ -11,6 +11,7 @@ import (
 	"database/sql"
 	"errors"
 	"fmt"
+	"github.com/gogf/gf/internal/cmdenv"
 	"time"
 
 	"github.com/gogf/gf/container/gvar"
@@ -262,8 +263,17 @@ var (
 	// regularFieldNameRegPattern is the regular expression pattern for a string
 	// which is a regular field name of table.
 	regularFieldNameRegPattern = `^[\w\.\-]+$`
+
+	// allDryRun sets dry-run feature for all database connections.
+	// It is commonly used for command options for convenience.
+	allDryRun = false
 )
 
+func init() {
+	// allDryRun is initialized from environment or command options.
+	allDryRun = cmdenv.Get("gf.gdb.dryrun", false).Bool()
+}
+
 // Register registers custom database driver to gdb.
 func Register(name string, driver Driver) error {
 	driverMap[name] = driver

database/gdb/gdb_core_config.go

@@ -186,6 +186,10 @@ func (c *Core) SetDryRun(dryrun bool) {
 
 // GetDryRun returns the DryRun value.
 func (c *Core) GetDryRun() bool {
+	if allDryRun {
+		// Globally set.
+		return true
+	}
 	return c.dryrun.Val()
 }