用mysql存储过程代替递归查询

2

3

4

5

6

7

8

9

10

11

12

13

14

15

public void findCorpcompanyListByParentId(List<UapcompanyVo> vos,String parentId){

        UapcompanyParam param = new UapcompanyParam();

        param.setParentid(parentId);

        List<Uapcompany> companyList = uapcompanyDao.finduapcompanyList(param);

        UapcompanyVo uapcompanyVo = null;

        for(Uapcompany uapcompany : companyList){

            uapcompanyVo = new UapcompanyVo();

            uapcompanyVo = new UapcompanyVo();

            uapcompanyVo.setId(uapcompany.getId());

            uapcompanyVo.setName(uapcompany.getName());

            uapcompanyVo.setParentid(uapcompany.getParentid());

            vos.add(uapcompanyVo);

            this.findCorpcompanyListByParentId(vos, uapcompany.getParentid());

        }

}

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

BEGIN

    #声明一个flag变量，默认值为-99

    DECLARE flag INT DEFAULT -99;

    #创建companyTempTabl_Qurey临时表

    CREATE TEMPORARY TABLE IF NOT EXISTS companyTempTabl_Qurey (

        id VARCHAR(32) NOT NULL,

        `name` VARCHAR(100),

        attr VARCHAR(30),

        parentId VARCHAR(32)

    );

    TRUNCATE TABLE companyTempTabl_Qurey;

  　　　 #创建companyTempTabl_Result临时表

  　　　 CREATE TEMPORARY TABLE IF NOT EXISTS companyTempTabl_Result (

        id VARCHAR (32) NOT NULL,

        `name` VARCHAR (100),

        attr VARCHAR (30),

        parentId VARCHAR (32)

    );

    TRUNCATE TABLE companyTempTabl_Result;

    #根据参数 parentId 查询数据，并插入companyTempTabl_Qurey临时表

    INSERT INTO companyTempTabl_Qurey (

        id,

        `name`,

        attr,

        parentId

    ) SELECT

    uapcompany.id,

    uapcompany.`name`,

    uapcompany.attr,

    uapcompany.parentId

    FROM uapcompany

    WHERE uapcompany.parentId = `parentId`;

  　　　 #根据参数 parentId 查询数据，并插入companyTempTabl_Result临时表

    INSERT INTO companyTempTabl_Result (

        id,

        `name`,

        attr,

        parentId

    ) SELECT

    uapcompany.id,

    uapcompany.`name`,

    uapcompany.attr,

    uapcompany.parentId

    FROM uapcompany

    WHERE uapcompany.parentId = `parentId`;

    #根据参数 parentId 统计查询总数，并赋值给变量flag

    SELECT count(1) INTO flag

    FROM uapcompany

    WHERE uapcompany.parentId = `parentId`;

    #如果flag 大于 0，则进行循环

    WHILE flag > 0 DO

        #创建companyTempTabl_temp 临时表

        CREATE TEMPORARY TABLE IF NOT EXISTS companyTempTabl_temp (

            id VARCHAR (32) NOT NULL,

            `name` VARCHAR (100),

            attr VARCHAR (30),

            parentId VARCHAR (32)

        );

        TRUNCATE TABLE companyTempTabl_temp;

        #数据库表uapcompany关联临时表companyTempTabl_Qurey查询，并将查询结果插入 临时表companyTempTabl_temp

        INSERT INTO companyTempTabl_temp (id, `name`, attr, parentId) SELECT

            uapcompany.id,

            uapcompany.`name`,

            uapcompany.attr,

            uapcompany.parentId

        FROM

            uapcompany,

            companyTempTabl_Qurey

        WHERE

            uapcompany.parentId = companyTempTabl_Qurey.id;

        #删除临时表companyTempTabl_Qurey数据

        DELETE FROM companyTempTabl_Qurey;

        #将临时表companyTempTabl_temp的数据 插入companyTempTabl_Qurey临时表，用作下一个循环的条件

        INSERT INTO companyTempTabl_Qurey (id, `name`, attr, parentId) SELECT

            companyTempTabl_temp.id,

            companyTempTabl_temp.`name`,

            companyTempTabl_temp.attr,

            companyTempTabl_temp.parentId

        FROM

            companyTempTabl_temp;

        #将临时表companyTempTabl_temp的数据 插入到companyTempTabl_Result临时表（该表的数据也是我们最终要返回的数据）

        INSERT INTO companyTempTabl_Result (id, `name`, attr, parentId) SELECT

            companyTempTabl_temp.id,

            companyTempTabl_temp.`name`,

            companyTempTabl_temp.attr,

            companyTempTabl_temp.parentId

        FROM

            companyTempTabl_temp;

        #删除companyTempTabl_temp数据

        DROP TABLE companyTempTabl_temp;

        #数据库表uapcompany关联 临时表companyTempTabl_Qurey查询统计，并将结果赋值给变量flag

        SELECT

            count(1) INTO flag

        FROM

            uapcompany,

            companyTempTabl_Qurey

        WHERE

            uapcompany.parentId = companyTempTabl_Qurey.id;

    END WHILE;

    SELECT id ,`name`,attr,parentId  FROM companyTempTabl_Result;

END