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

————————–

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<Employee> selectWithParam(Map<String,Object> 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<String, Object> 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

//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：

——————————

动态插入@InsertProvider

 

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

 

　　

//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：

————————-

@UpdateProvider

 

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

 

//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：

—————————-

@DeleteProvider

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

　

//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：