support foreign key.添加 外键支持

data/view/model/genmysql/def.go

@@ -14,3 +14,15 @@ type genColumns struct {
 	Desc  string `gorm:"column:Comment"`
 	Null  string `gorm:"column:Null"`
 }
+
+//select table_schema,table_name,column_name,referenced_table_schema,referenced_table_name,referenced_column_name from INFORMATION_SCHEMA.KEY_COLUMN_USAGE
+// where table_schema ='matrix' AND REFERENCED_TABLE_NAME IS NOT NULL AND TABLE_NAME = 'credit_card' ;
+// genForeignKey Foreign key of db info . 表的外键信息
+type genForeignKey struct {
+	TableSchema           string `gorm:"column:table_schema"`            // Database of columns.列所在的数据库
+	TableName             string `gorm:"column:table_name"`              // Data table of column.列所在的数据表
+	ColumnName            string `gorm:"column:column_name"`             // Column names.列名
+	ReferencedTableSchema string `gorm:"column:referenced_table_schema"` // The database where the index is located.该索引所在的数据库
+	ReferencedTableName   string `gorm:"column:referenced_table_name"`   // Affected tables . 该索引受影响的表
+	ReferencedColumnName  string `gorm:"column:referenced_column_name"`  // Which column of the affected table.该索引受影响的表的哪一列
+}