PostgreSQL 存储过程中回滚(ROLLBACK)和数组的使用

上代码先:

CREATE OR REPLACE FUNCTION reg_role_avatar(IN _role_uuid ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter,IN _role_user_uuid ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter,IN _role_server_id integer,IN _role_name ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter,IN _role_avatar_gender integer,IN _role_avatar_hide_hat boolean,IN _role_avatar_hide_eyes boolean,IN _place integer,IN _item_uuids ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter <a href="https://www.jb51.cc/tag/varying/" target="_blank" class="keywords">varying</a>[],IN _base_keys ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter <a href="https://www.jb51.cc/tag/varying/" target="_blank" class="keywords">varying</a>[],IN _item_girds integer[],IN _item_is_bindings boolean[],IN _item_valid integer[],OUT _cord boolean,OUT _date timestamp without time zone) RETURNS record AS $BODY$ begin _cord =true; _date=clock_timestamp(); insert into roles( role_uuid,role_user_uuid,role_server_id,role_name,role_avatar_gender,role_avatar_hide_hat,role_avatar_hide_eyes,role_create_date )values ( _role_uuid,_role_user_uuid,_role_server_id,_role_name,_role_avatar_gender,_role_avatar_hide_hat,_role_avatar_hide_eyes,_date); FOR i IN 1..array_length(_item_uuids,1) LOOP insert into items( item_uuid,item_role_uuid,item_base_key,item_place,item_gird,item_is_binding,item_valid,item_buy_date )values( _item_uuids[i],_role_uuid,_base_keys[i],_place,_item_girds[i],_item_is_bindings[i],_item_valid[i],_date); END LOOP; EXCEPTION WHEN OTHERS THEN ROLLBACK; _cord =false; commit; END; $BODY$ LANGUAGE 'plpg<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>' VOLATILE COST 100;

回滚使用如下:

EXCEPTION

WHEN OTHERS THEN

ROLLBACK;

如果出现异常，则回滚(ROLLBACK)

再说说psql（Postgresql简称）的数组

上面的那个例子也有数组的使用方法，可能内容有点多，下面还有个简单点的测试用例：

存储过程支持基本的数据类型作为数组参数

测试通过的数据类型有:boolean,int,String

CREATE OR REPLACE FUNCTION test_boolean_array(IN _array boolean[],OUT _done boolean) RETURNS boolean AS $BODY$ begin _done=_array[2]; end; $BODY$ LANGUAGE 'plpg<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>' VOLATILE COST 100;

使用boolean[] 数组作为参数传入

有一点要注意，psql中的数组是人1开始的，也就是说，在java中boolean[0]对应于psql中的boolean[1]

上面的存储过程只做了两件事，接收一个boolean数组作为参数传入，然后输出数组的boolean[1](java中的boolean[0])

在java中的代码如下：

public int testBooleanArray() { boolean done =false; CallableStatement cs = null; Connection connection = null; Array <a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>Array = null; try { connection = JDBServer.instance().getCommonDBConnection(); connection.setAutoCommit(false); <a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>Array = connection.createArrayOf("boolean",new Boolean[] {false,true}); cs = connection.prepareCall("{call test_boolean_array(?,?)}"); cs.setArray(1,<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>Array); cs.registerOutP<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>meter(2,Types.BOOLEAN); cs.executeUpdate(); done = cs.getBoolean(2); } catch (<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>Exception e) { e.<a href="https://www.jb51.cc/tag/printstacktrace/" target="_blank" class="keywords">printstacktrace</a>(); } finally { try { if (cs != null) cs.close(); if (connection != null) connection.close(); } catch (<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>Exception e) { e.<a href="https://www.jb51.cc/tag/printstacktrace/" target="_blank" class="keywords">printstacktrace</a>(); } } Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("done=" + done); return 0; }

创建一个数组(Array)，sql中的数据要用connection创建

sqlArray = connection.createArrayOf("boolean",true});

剩下就是注册输出了，没什么了！

再大概说下int 和String 数组在Psql中的使用吧：

CREATE OR REPLACE FUNCTION test(IN _array integer[],OUT _done integer) RETURNS integer AS $BODY$ begin _done=_array[1]; end;

java中

sqlArray = connection.createArrayOf("int4",new Integer[] {1,20});

记住,是int4

CREATE OR REPLACE FUNCTION test_string_array(IN _array ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter <a href="https://www.jb51.cc/tag/varying/" target="_blank" class="keywords">varying</a>[],OUT _done ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter <a href="https://www.jb51.cc/tag/varying/" target="_blank" class="keywords">varying</a>) RETURNS ch<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>cter <a href="https://www.jb51.cc/tag/varying/" target="_blank" class="keywords">varying</a> AS $BODY$ begin _done=_array[1]; end; $BODY$ LANGUAGE 'plpg<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>' VOLATILE COST 100;

java 中

connection.createArrayOf("varchar",new String[] {"test1","test2"});

原文地址：https://www.jb51.cc/postgresql/197115.html