如何设置和回滚到保存点?(How to set & rollback to a savepoint ?)
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小牛编辑
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2023-12-01
问题描述 (Problem Description)
如何在java中创建Savepoint和Rollback?
解决方案 (Solution)
以下示例使用Rollback方法连接到Rollback以前保存的SavePoint。
import java.sql.*;
public class jdbcConn {
public static void main(String[] args) throws Exception {
Class.forName("org.apache.derby.jdbc.ClientDriver");
Connection con = DriverManager.getConnection(
"jdbc:derby://localhost:1527/testDb","name","pass");
Statement stmt = con.createStatement();
String query1 = "insert into emp values(5,'name','job')";
String query2 = "select * from emp";
con.setAutoCommit(false);
Savepoint spt1 = con.setSavepoint("svpt1");
stmt.execute(query1);
ResultSet rs = stmt.executeQuery(query2);
int no_of_rows = 0;
while (rs.next()) {
no_of_rows++;
}
System.out.println("rows before rollback statement = " + no_of_rows);
con.rollback(spt1);
con.commit();
no_of_rows = 0;
rs = stmt.executeQuery(query2);
while (rs.next()) {
no_of_rows++;
}
System.out.println("rows after rollback statement = " + no_of_rows);
}
}
结果 (Result)
上面的代码示例将产生以下结果。 结果可能会有所不同。
rows before rollback statement = 4
rows after rollback statement = 3