本文主要讲述mybatis如何解决mysql的字段名与java实体类的成员变量名称不一致。

一. 介绍实体类和数据表

public class Employee {
private Integer empId;
private String empName;
private Integer age;
private String gender;
// private Integer deptId;

public Employee() {  
}

public Employee(Integer empId, String empName, Integer age, String gender) {  
    this.empId = empId;  
    this.empName = empName;  
    this.age = age;  
    this.gender = gender;  
}

public Integer getEmpId() {  
    return empId;  
}

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

public String getEmpName() {  
    return empName;  
}

public void setEmpName(String empName) {  
    this.empName = empName;  
}

public Integer getAge() {  
    return age;  
}

public void setAge(Integer age) {  
    this.age = age;  
}

public String getGender() {  
    return gender;  
}

public void setGender(String gender) {  
    this.gender = gender;  
}

@Override  
public String toString() {  
    return "Employee{" +  
            "empId=" + empId +  
            ", empName='" + empName + '\\'' +  
            ", age=" + age +  
            ", gender='" + gender + '\\'' +  
            '}';  
}  

}

CREATE TABLE t_emp (
emp_id INT PRIMARY KEY AUTO_INCREMENT,
emp_name VARCHAR(32) NOT NULL DEFAULT '',
age INT NOT NULL DEFAULT 20,
gender CHAR(1) CHECK(gender IN ('男','女')))
CHARACTER SET utf8 COLLATE utf8_bin ENGINE INNODB;

　　

二. 引出问题

　　EmpMapper接口声明如下

public interface EmpMapper {

// 显示所有数据  
List<Employee> selectEmpAll();  

}

　　EmpMapper.xml文件声明如下

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