我想知道是否可以使用JDBC执行类似的操作。
"SELECT FROM * TABLE;INSERT INTO TABLE;"
是的,有可能。据我所知,有两种方法。他们是
以下示例演示了上述两种可能性。
:(允许多个查询):
发送连接请求时,您需要将连接属性附加allowMultiQueries=true
到数据库URL。这是额外的连接属性,如果那些已经存在的一些,比如autoReConnect=true
,对等。可接受的值allowMultiQueries
属性是true
,false
,yes
,和no
。其他任何值在运行时都会被拒绝sqlException
。
String dbUrl = "jdbc:MysqL:///test?allowMultiQueries=true";
除非通过了此类指令,否则sqlException
将引发an 。
您必须使用execute( String sql )
或其其他变体来获取查询执行的结果。
boolean hasMoreResultSets = stmt.execute( multiQuerysqlString );
要遍历和处理结果,您需要执行以下步骤:
READING_QUERY_RESULTS: // label
while ( hasMoreResultSets || stmt.getUpdateCount() != -1 ) {
if ( hasMoreResultSets ) {
Resultset rs = stmt.getResultSet();
// handle your rs here
} // if has rs
else { // if ddl/dml/...
int queryResult = stmt.getUpdateCount();
if ( queryResult == -1 ) { // no more queries processed
break READING_QUERY_RESULTS;
} // no more queries processed
// handle success, failure, generated keys, etc here
} // if ddl/dml/...
// check to continue in the loop
hasMoreResultSets = stmt.getMoreResults();
} // while results
:要遵循的步骤:
样品表和程序 :
MysqL> create table tbl_mq( i int not null auto_increment, name varchar(10), primary key (i) );
Query OK, 0 rows affected (0.16 sec)
MysqL> delimiter //
MysqL> create procedure multi_query()
-> begin
-> select count(*) as name_count from tbl_mq;
-> insert into tbl_mq( names ) values ( 'ravi' );
-> select last_insert_id();
-> select * from tbl_mq;
-> end;
-> //
Query OK, 0 rows affected (0.02 sec)
MysqL> delimiter ;
MysqL> call multi_query();
+------------+
| name_count |
+------------+
| 0 |
+------------+
1 row in set (0.00 sec)
+------------------+
| last_insert_id() |
+------------------+
| 3 |
+------------------+
1 row in set (0.00 sec)
+---+------+
| i | name |
+---+------+
| 1 | ravi |
+---+------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
从Java调用过程 :
CallableStatement cstmt = con.prepareCall( "call multi_query()" );
boolean hasMoreResultSets = cstmt.execute();
READING_QUERY_RESULTS:
while ( hasMoreResultSets ) {
Resultset rs = stmt.getResultSet();
// handle your rs here
} // while has more rs