如果實體名稱保存在變量中，如何編寫休眠插入查詢

Question

在我的應用程序中，我遇到一種情況，我需要將一些數據保存到實體，但是實體名稱未知，並且保存在變量和實體字段中，並且其值在列表中。所以我需要選擇實體名稱變量及其字段和列表中的數據。 變量是xEntity。

public void saveData(String xEntity,List<Attribute> attributeList) {
  // hibernate insert query
}

下面顯示了一些實體類，它們可能作為xEntity和函數saveData（）中的attributeList出現。

@Entity
    @Table(name = "person")
    public class Person implements Serializable {
        @Id
        @GeneratedValue
        @Column(name = "id")
        private Integer id;

        @Column(name = "emp_id")
        private String empId;

        @Column(name = "name")
        private String name;

        @Column(name="dob")
        private Date dob;

        @Column(name="active")
        private Boolean active;

        @Column(name="created_on")
        private Timestamp createdOn;

        public Person() {
        }

        public Person(Integer id, String empId, String name, Date dob, Boolean active, Timestamp createdOn) {
            this.id = id;
            this.empId = empId;
            this.name = name;
            this.dob = dob;
            this.active = active;
            this.createdOn = createdOn;
        }

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public String getEmpId() {
            return empId;
        }

        public void setEmpId(String empId) {
            this.empId = empId;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public Date getDob() {
            return dob;
        }

        public void setDob(Date dob) {
            this.dob = dob;
        }

        public Boolean getActive() {
            return active;
        }

        public void setActive(Boolean active) {
            this.active = active;
        }

        public Timestamp getCreatedOn() {
            return createdOn;
        }

        public void setCreatedOn(Timestamp createdOn) {
            this.createdOn = createdOn;
        }
    }


    @Entity
    @Table(name = "person_address")
    public class PersonAddress implements Serializable {
        @Id
        @GeneratedValue
        @Column(name = "id")
        private Integer id;

        @Column(name = "emp_id")
        private String empId;

        @Column(name = "house_name")
        private String houseName;

        @Column(name="post_office")
        private String postOffice;

        @Column(name="district")
        private String district;

        @Column(name="state")
        private String state;

        @Column(name="active")
        private Boolean active;

        @Column(name="created_on")
        private Timestamp createdOn;

        public PersonAddress() {
        }

        public PersonAddress(Integer id, String empId, String houseName, String postOffice, String district, String state, Boolean active, Timestamp createdOn) {
            this.id = id;
            this.empId = empId;
            this.houseName = houseName;
            this.postOffice = postOffice;
            this.district = district;
            this.state = state;
            this.active = active;
            this.createdOn = createdOn;
        }

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public String getEmpId() {
            return empId;
        }

        public void setEmpId(String empId) {
            this.empId = empId;
        }

        public String getHouseName() {
            return houseName;
        }

        public void setHouseName(String houseName) {
            this.houseName = houseName;
        }

        public String getPostOffice() {
            return postOffice;
        }

        public void setPostOffice(String postOffice) {
            this.postOffice = postOffice;
        }

        public String getDistrict() {
            return district;
        }

        public void setDistrict(String district) {
            this.district = district;
        }

        public void setState(String state) {
            this.state = state;
        }

        public Boolean getActive() {
            return active;
        }

        public void setActive(Boolean active) {
            this.active = active;
        }

        public Timestamp getCreatedOn() {
            return createdOn;
        }

        public void setCreatedOn(Timestamp createdOn) {
            this.createdOn = createdOn;
        }
    }


    @Entity
    @Table(name = "person_qualification")
    public class PersonQualification implements Serializable {
        @Id
        @GeneratedValue
        @Column(name = "id")
        private Integer id;

        @Column(name = "emp_id")
        private String empId;

        @Column(name = "degree")
        private String degree;

        @Column(name="grade")
        private String grade;

        @Column(name="active")
        private Boolean active;

        @Column(name="created_on")
        private Timestamp createdOn;

        public PersonQualification() {
        }

        public PersonQualification(Integer id, String empId, String degree, String grade, Boolean active, Timestamp createdOn) {
            this.id = id;
            this.empId = empId;
            this.degree = degree;
            this.grade = grade;
            this.active = active;
            this.createdOn = createdOn;
        }

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public String getEmpId() {
            return empId;
        }

        public void setEmpId(String empId) {
            this.empId = empId;
        }

        public String getDegree() {
            return degree;
        }

        public void setDegree(String degree) {
            this.degree = degree;
        }

        public String getGrade() {
            return grade;
        }

        public void setGrade(String grade) {
            this.grade = grade;
        }

        public Boolean getActive() {
            return active;
        }

        public void setActive(Boolean active) {
            this.active = active;
        }

        public Timestamp getCreatedOn() {
            return createdOn;
        }

        public void setCreatedOn(Timestamp createdOn) {
            this.createdOn = createdOn;
        }
    }       

以下是每次可能會出現在attributeList上的一些值。

    attributeList = [{"fieldName":"empId","value":"EMP_123"},{"fieldName":"name","value":"Basil"},{"fieldName":"dob","value":"26-11-90"}]

    attributeList = [{"fieldName":"empId","value":"EMP_123"},{"fieldName":"houseName","value":"Ellikkal"},{"fieldName":"postOffice","value":"Chengara"},{"fieldName":"district","value":"Alappy"},{"fieldName":"state","value":"Kerala"}]

    attributeList = [{"fieldName":"empId","value":"EMP_123"},{"fieldName":"degree","value":"B.Tech"},{"fieldName":"grade","value":"First class"}]

日期值以字符串日期形式出現，應設置為日期類型。以下是Attribute類。

        public class Attribute implements Serializable {
        private String fieldName;
        private String value;

        public Attribute() {
            super();
            // TODO Auto-generated constructor stub
        }

        public Attribute(String fieldName, String value) {
            this.fieldName = fieldName;
            this.value = value;
        }

        public String getFieldName() {
            return fieldName;
        }

        public void setFieldName(String fieldName) {
            this.fieldName = fieldName;
        }

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

    }

現在我可以使用休眠查詢將數據保存到每個實體嗎？如果有人知道，請幫助我。

Answer 1

恐怕HQL不支持為每個查詢插入，但是您可以使用反射來構建實體或創建本機查詢。

Answer 2

雖然我不知道為什么要這么做，但是如果您別無選擇，那么就必須在這里使用反射。

首先使用您的類名創建實例。 它應該是完整的類名。 另外，您的類應具有默認構造函數。

Class<?> clazz = Class.forName(className);
Constructor<?> ctor = clazz.getConstructor();
Object object = ctor.newInstance();

現在，使用反射來設置字段的值。 假設您的字段名稱存儲在fieldName中，而值存儲在fieldValue中

declaredField = object.getClass().getDeclaredField(fieldName);
declaredField.setAccessible(true);
declaredField.set(object, fieldValue);

對於需要將類型從String轉換為Date等的情況，您必須獲取字段類型並進行相應的轉換。 字段類型可以通過以下方式找到：

declaredField.getFieldType();

現在使用休眠保存該對象。

sessionFactory.getCurrentSession().save(object);