Question

MyBatis怎么调用PostgreSQL存储过程

Answer 1

1.调用没有OUT参数的存储过程：
创建存储过程：
create or replace function get_code(a1 varchar(32)) returns varchar(32) as $$
declare the_result varchar(32);
begin
the_result := name from t_project where id = a1;
return the_result;
end;
$$
language plpgsql;
sqlMap配置文件：
<select id="f1" resultType="String" parameterType="map" statementType="CALLABLE" useCache="false">
<![CDATA[
select get_code(
#{a1,mode=IN,jdbcType=VARCHAR}
)
]]>
</select>
注：不使用OUT参数的存储过程可以直接用 select
程序：
public String generateCode(String a1) {
Map<String,String> paramMap = new HashMap<String,String>();
paramMap.put("a1", a1);
SqlSession sqlSession = getSqlSession();
String result = sqlSession.selectOne("f1", paramMap);
return result;
}
2.使用OUT参数的存储过程：
创建存储过程：
create or replace function testproc(a1 varchar(32),out a2 varchar(32),out a3 varchar(32)) as $$
declare
begin
select id into a2 from t_project where id=a1;
select name into a3 from t_project where id=a1;
return;
end;
$$
language plpgsql;
sqlMap配置文件：
<select id="generateCode1" parameterType="map" statementType="CALLABLE" useCache="false">
{
call testproc(
#{a1,mode=IN,jdbcType=VARCHAR},
#{a2,mode=OUT,jdbcType=VARCHAR},
#{a3,mode=OUT,jdbcType=VARCHAR}
)
}
</select>
程序：
public Map generateCode1(String a1) {
Map<String,String> paramMap = new HashMap<String,String>();
paramMap.put("a1", k1);
SqlSession sqlSession = getSqlSession();
sqlSession.selectOne("generateCode1", paramMap);
return paramMap;
}
带输出参数的存储过程，sqlSession.selectOne("generateCode1", paramMap);
将paramMap传入之后mybatis调用存储过程，将paramMap进行填充
paramMap最后的值：{a1=R20148800900, a2=R20148800900, a3=项目名称}