MYSQL查詢返回JSON格式的字符串

表數據：javascript 查詢展現效果：java { "class_no": [ {"student_name": "張三", "sex": "男", "age": "12", "class": "一班"} ,{"student_name": "李四", "sex": "男", "age": "12", "class": "一班"} ,{"student_name": "王五"

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