goctl model reactor (#15)

* reactor sql generation

* reactor sql generation

* add console & example

* optimize unit test & add document

* modify default config

* remove test file

* Revert "remove test file"

This reverts commit 81041f9e

* fix stringx.go & optimize example

* remove unused code

tools/goctl/model/sql/converter/types.go

@@ -0,0 +1,46 @@
+package converter
+
+import (
+	"fmt"
+	"strings"
+)
+
+var (
+	commonMysqlDataTypeMap = map[string]string{
+		// For consistency, all integer types are converted to int64
+		"tinyint":    "int64",
+		"smallint":   "int64",
+		"mediumint":  "int64",
+		"int":        "int64",
+		"integer":    "int64",
+		"bigint":     "int64",
+		"float":      "float64",
+		"double":     "float64",
+		"decimal":    "float64",
+		"date":       "time.Time",
+		"time":       "string",
+		"year":       "int64",
+		"datetime":   "time.Time",
+		"timestamp":  "time.Time",
+		"char":       "string",
+		"varchar":    "string",
+		"tinyblob":   "string",
+		"tinytext":   "string",
+		"blob":       "string",
+		"text":       "string",
+		"mediumblob": "string",
+		"mediumtext": "string",
+		"longblob":   "string",
+		"longtext":   "string",
+	}
+)
+
+func ConvertDataType(dataBaseType string) (goDataType string, err error) {
+	tp, ok := commonMysqlDataTypeMap[strings.ToLower(dataBaseType)]
+	if !ok {
+		err = fmt.Errorf("unexpected database type: %s", dataBaseType)
+		return
+	}
+	goDataType = tp
+	return
+}