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"
)
List<Employee>selectWithEmployee(Employee employee);
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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();
}
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测试：
------------------------------
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();
}
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测试：
-------------------------
@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();
}
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测试：
----------------------------
@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();
}
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测试：
