Dao-mode multi-table joint investigation

First, the query for all student records, grades contain name

1. Create a Student entity class encapsulates property

public class IStudent {

  IGrade grade=new IGrade();


public IGrade getGrade() {
  return grade;
}

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


private int StudentNo;
private String loginPwd;
private String StudentName;
private int Sex;
private int GradeId;
private String phone;
private String BornDate;
private String email;
private String IdentityCard;
private String address;


public String getAddress() {
  return address;
}

public void setAddress(String address) {
  this.address = address;
}

public int getStudentNo() {
  return StudentNo;
}

public void setStudentNo(int studentNo) {
  StudentNo = studentNo;
}
public String getLoginPwd() {
  return loginPwd;
}
public void setLoginPwd(String loginPwd) {
  this.loginPwd = loginPwd;
}
public String getStudentName() {
  return StudentName;
}
public void setStudentName(String studentName) {
  StudentName = studentName;
}
public int getSex() {
  return Sex;
}
public void setSex(int sex) {
Sex = sex;
}
public int getGradeId() {
  return GradeId;
}
public void setGradeId(int gradeId) {
  GradeId = gradeId;
}
public String getPhone() {
  return phone;
}
public void setPhone(String phone) {
    this.phone = phone;
}
public String getBornDate() {
  return BornDate;
}
public void setBornDate(String bornDate) {
  BornDate = bornDate;
}
public String getEmail() {
  return email;
}
public void setEmail(String email) {
  this.email = email;
}
public String getIdentityCard() {
  return IdentityCard;
}
public void setIdentityCard(String identityCard) {
  IdentityCard = identityCard;
}



public IStudent(int studentNo, String loginPwd, String studentName, int sex,
  int gradeId, String phone, String bornDate, String email,
String identityCard) {

StudentNo = studentNo;
this.loginPwd = loginPwd;
StudentName = studentName;
Sex = sex;
GradeId = gradeId;
this.phone = phone;
BornDate = bornDate;
this.email = email;
IdentityCard = identityCard;
}
public IStudent() {

// TODO Auto-generated constructor stub
}


}

 

 

2. Create an interface layer Dao students to write the query method

   Grade way to write a query table

 

 

 

 

3. Create Tools

 

 

 

 

4. The realization of the interface layer and inherited tools Dao

 

 

5. Test class UI

 

 

 

 

Second, the inquiry S1年级下的学生记录

Grade 1. Create a table entity class and create a collection of entity classes students

 

 

 

2. The method of preparation of the layer Dao

 

 

 3. To achieve Dao Interface

 

 4. Test UI layer

 

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Origin www.cnblogs.com/wws553/p/10945582.html