让Java从MySQL返回多个ResultSet

首先,JDBC对于SQLSERVER来说默认是支持返回,但对于MySql来说,只默认支持存储过程返回多个ResultSet,那对于手写SQL怎么办。

其实很简单,只要一个在连接字符串中加一个参数:allowMultiQueries=true。

代码实现如下:

@Test
public void test01() throws SQLException, ClassNotFoundException {
String DBDRIVER = “com.mysql.jdbc.Driver”;
String DBURL = “jdbc:mysql://localhost:3306/bookstore?allowMultiQueries=true”;
String DBUSER = “root”;
String DBPASS = “root”;

Connection conn = null;
Class.forName(DBDRIVER);
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
System.out.println(conn);
String sql = “SELECT * FROM category;”
+”SELECT * FROM user;” ;
Statement stmt = conn.createStatement();

boolean isResultSet = stmt.execute(sql);
ResultSet rs = null;
int count = 0;
while(true) {
if(isResultSet) {
rs = stmt.getResultSet();
while(rs.next()) {
System.out.println(rs.getString(1));
}
rs.close();
} else {
if(stmt.getUpdateCount() == -1) {
break;
}
System.out.printf(“Result {} is just a count: {}”, count, stmt.getUpdateCount());
}

count ++;
isResultSet = stmt.getMoreResults();
}
stmt.close();
conn.close();
}

:http://www.linuxidc.com/Linux/2017-08/146356.htm