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<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")List<Employee>selectWithEmployee(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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//deleteEmployeeSqlpublic 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：
