mybatis注解开发-动态SQL

实体类以及表结构

在mybatis-config.xml中注册mapper接口

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动态查询@SelectProvider

EmployeeMapper接口

package Intefaceproxy.Dyno;

import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.SelectProvider;
import model.Employee;

public interface EmployeeMapper {
    //动态查询  type:指定一个类    method:使用这个类中的selectWhitParamSql方法返回的sql字符串  作为查询的语句
    @SelectProvider(type=Intefaceproxy.Dyno.EmployeeDynaSqlProvider.class,method="selectWhitParamSql")
    List selectWithParam(Map param);
}

返回sql语句的类

package Intefaceproxy.Dyno;

import java.util.Map;

import org.apache.ibatis.jdbc.SQL;

public class EmployeeDynaSqlProvider {
    //方法中的关键字是区分大小写的  SQL SELECT WHERE
    //该方法会根据传递过来的map中的参数内容  动态构建sql语句
    public String selectWhitParamSql(Map param) {
        return new SQL() {
            {
                SELECT("*");
                FROM("tb_employee");
                if (param.get("id")!=null) {
                    WHERE("id=#{id}");
                }
                if(param.get("loginname")!=null) {
                    WHERE("loginname=#{loginname}");
                }
                if(param.get("password")!=null) {
                    WHERE("password=#{password}");
                }
                if(param.get("name")!=null) {
                    WHERE("name=#{name}");
                }
                if(param.get("sex")!=null) {
                    WHERE("sex=#{sex}");
                }
                if(param.get("age")!=null) {
                    WHERE("age=#{age}");
                }
                if(param.get("phone")!=null) {
                    WHERE("phone=#{phone}");
                }
                if(param.get("sal")!=null) {
                    WHERE("sal=#{sal}");
                }
                if(param.get("state")!=null) {
                    WHERE("state=#{state}");
                }
            }
            
        }.toString();
    }
}

测试：

当然也可以传递employee对象

接口：

//传递employee对象 @SelectProvider(type=Intefaceproxy.Dyno.EmployeeDynaSqlProvider.class,method="selectWhitEmployeeSql") ListselectWithEmployee(Employee employee);

返回sql的类

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//selectWhitEmployeeSql     public String selectWhitEmployeeSql(Employee employee) {         return new SQL() {             {                 SELECT("*");                 FROM("tb_employee");                 if (employee.getId()!=null) {                     WHERE("id=#{id}");                 }                 if(employee.getLoginname()!=null) {                     WHERE("loginname=#{loginname}");                 }                 if(employee.getPassword()!=null) {                     WHERE("password=#{password}");                 }                 if(employee.getName()!=null) {                     WHERE("name=#{name}");                 }                 if(employee.getSex()!=null) {                     WHERE("sex=#{sex}");                 }             }         }.toString();     }

测试：

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动态插入@InsertProvider

 

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//动态插入     @InsertProvider(type=Intefaceproxy.Dyno.EmployeeDynaSqlProvider.class,method="insertEmployeeSql")     @Options(useGeneratedKeys=true,keyProperty="id")     int insertEmployee(Employee employee);

 

　　

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//insertEmployeeSql     public String insertEmployeeSql(Employee employee) {         return new SQL() {             {                 INSERT_INTO("tb_employee");                 if(employee.getLoginname()!=null) {                     VALUES("loginname","#{loginname}");                 }                 if(employee.getPassword()!=null) {                     VALUES("password", "#{password}");                 }                 if(employee.getName()!=null) {                     VALUES("name", "#{name}");                 }                 if(employee.getSex()!=null) {                     VALUES("sex", "#{sex}");                 }                 if(employee.getAge()!=null) {                     VALUES("age", "#{age}");                 }                 if(employee.getPhone()!=null) {                     VALUES("phone", "#{phone}");                 }                 if(employee.getSal()!=null) {                     VALUES("sal", "#{sal}");                 }                 if(employee.getState()!=null) {                     VALUES("state", "#{state}");                 }             }         }.toString();     }

测试：

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@UpdateProvider

 

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//动态更新     @UpdateProvider(type=Intefaceproxy.Dyno.EmployeeDynaSqlProvider.class,method="updateEmployeeSql")     void updateEmployee(Employee employee);

 

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//updateEmployeeSql     public String updateEmployeeSql(Employee employee) {         return new SQL() {             {                 UPDATE("tb_employee");                 if(employee.getLoginname()!=null) {                     SET("loginname=#{loginname}");                 }                 if(employee.getPassword()!=null) {                     SET("password=#{password}");                 }                 if(employee.getName()!=null) {                     SET("name=#{name}");                 }                 if(employee.getSex()!=null) {                     SET("sex=#{sex}");                 }                 if(employee.getAge()!=null) {                     SET("age=#{age}");                 }                 if(employee.getPhone()!=null) {                     SET("phone=#{phone}");                 }                 if(employee.getSal()!=null) {                     SET("sal=#{sal}");                 }                 if(employee.getState()!=null) {                     SET("state=#{state}");                 }                 WHERE("id=#{id}");             }         }.toString();     }

测试：

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@DeleteProvider

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//动态删除 @DeleteProvider(type=Intefaceproxy.Dyno.EmployeeDynaSqlProvider.class,method="deleteEmployeeSql") void deleteEmployee(Employee employee);

　

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//deleteEmployeeSql public String deleteEmployeeSql(Employee employee) {     return new SQL() {         {             DELETE_FROM("tb_employee");             if(employee.getLoginname()!=null) {                 WHERE("loginname=#{loginname}");             }             if(employee.getPassword()!=null) {                 WHERE("password=#{password}");             }             if(employee.getName()!=null) {                 WHERE("name=#{name}");             }         }     }.toString(); }

　测试：

　

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查看更多随笔：https://www.cnblogs.com/Joke-Jay/p/8524722.html