{Student: id=1, name=小明, gender=male, grade=1, score=88}

{Student: id=2, name=小红, gender=male, grade=1, score=95}

{Student: id=3, name=小军, gender=female, grade=1, score=93}

{Student: id=4, name=小白, gender=female, grade=1, score=100}

{Student: id=5, name=小牛, gender=male, grade=2, score=96}

{Student: id=6, name=小兵, gender=male, grade=2, score=99}

{Student: id=7, name=小强, gender=female, grade=2, score=86}

{Student: id=8, name=小乔, gender=female, grade=2, score=79}

{Student: id=9, name=小青, gender=male, grade=3, score=85}

{Student: id=10, name=小王, gender=male, grade=3, score=90}

{Student: id=11, name=小林, gender=female, grade=3, score=91}

{Student: id=12, name=小贝, gender=female, grade=3, score=77}

insert new student...

1 inserted.

insert new student and return id...

1 inserted. id = 14

update student...

1 updated.

delete student...

1 deleted.

{Student: id=1, name=小明, gender=male, grade=1, score=88}

{Student: id=2, name=小红, gender=male, grade=1, score=95}

{Student: id=3, name=小军, gender=female, grade=1, score=93}

{Student: id=4, name=小白, gender=female, grade=1, score=100}

{Student: id=5, name=小牛, gender=male, grade=2, score=96}

{Student: id=6, name=小兵, gender=male, grade=2, score=99}

{Student: id=7, name=小强, gender=female, grade=2, score=86}

{Student: id=9, name=小青, gender=male, grade=3, score=85}

{Student: id=10, name=小王, gender=male, grade=3, score=90}

{Student: id=11, name=小林, gender=female, grade=3, score=91}

{Student: id=12, name=小贝, gender=female, grade=3, score=99}

{Student: id=13, name=大白, gender=male, grade=3, score=97}

{Student: id=14, name=老王, gender=male, grade=3, score=99}