SQL Java 更新记录问题

Question

我尝试创建用户的过程将通过输入 "userID, userName, Resident, selectedTeam" 创建粉丝，并将保存到 'FAN' table。但是在创建“FAN”的同时，我想从 'FAN' 获取 "selectedTeam" 并通过获取 selectedTeam 并匹配它来更新“TEAM”table、“VOTES”列使用 teamID，如果成功，它将把投票记录增加 1（类似于 COUNT 的功能）。

我遇到的问题是正在创建 FAN，但未更新 VOTES 记录。什么都没发生。

这是更新命令

addEntry = 
           connection.prepareStatement( "UPDATE TEAM SET VOTES = VOTES + 1 "
                 + "WHERE TEAM_ID =" + getTeamID());
         addEntry.executeUpdate(); // insert the entry

SQL 脚本

DROP TABLE Fan;
DROP TABLE Player;
DROP TABLE Team;

CREATE TABLE Team
(Team_id INT,
Team_name VARCHAR (20),
Region VARCHAR (10),
League VARCHAR (30),
Manager VARCHAR (20),
Votes INT,
CONSTRAINT PK_Team PRIMARY KEY (Team_id));

CREATE TABLE Player 
(Player_id INT ,
Player_name CHAR (30),
Player_age INT ,
Player_position CHAR (3),
Nationality CHAR (20),
Team_id INT ,
CONSTRAINT PK_Player PRIMARY KEY (Player_id),
CONSTRAINT FK_Player FOREIGN KEY (Team_id) REFERENCES Team (Team_id));

CREATE TABLE Fan
(User_id INT ,
User_name CHAR (20),
Resident CHAR (20),
Selected_team INT,
CONSTRAINT PK_User PRIMARY KEY (User_id));

INSERT INTO Team
VALUES (1, 'Arsenal FC', 'England', 'Barclays Premier League', 'Arsene Wenger', 0);
INSERT INTO Team
VALUES (2, 'Aston Villa FC', 'England', 'Barclays Premier League', 'Tim Sherwood', 0);
INSERT INTO Team
VALUES (3, 'Reading FC', 'England', 'Championship', 'Steve Clark', 0);
INSERT INTO Team 
VALUES (4, 'Liverpool FC', 'England', 'Barclays Premier League', 'Brendan Rodgers', 0); 

INSERT INTO Player
VALUES (1001, 'Wojciech Szczensy', 24, 'GK', 'Poland', 1);
INSERT INTO Player
VALUES (1002, 'Kieran Gibbs', 25, 'DF' , 'England', 1);
INSERT INTO Player
VALUES (1003, 'Per Mertesacker', 30, 'DF', 'Germany', 1);
INSERT INTO Player
VALUES (1004, 'Laurent Koscielny', 29, 'DF', 'France', 1);
INSERT INTO Player
VALUES (1005, 'Tomas Rosicky', 34, 'MF', 'Czech Republic', 1);
INSERT INTO Player
VALUES (1006, 'Mikel Arteta', 32, 'MF', 'Spain', 1);
INSERT INTO Player
VALUES (1007, 'Jack Wilshere', 23, 'MF', 'England', 1);
INSERT INTO Player
VALUES (1008, 'Mesut Ozil', 26, 'MF', 'Germany', 1);
INSERT INTO Player
VALUES (1009, 'Olivier Giroud', 28, 'FW', 'France', 1);
INSERT INTO Player
VALUES (1010, 'Theo Walcott', 25, 'FW', 'England', 1);
INSERT INTO Player
VALUES (1011, 'Alex Oxlade-Chamberlain', 21, 'FW', 'England', 1);
INSERT INTO Player
VALUES (1012, 'Aaron Ramsey', 24, 'MF', 'Wales', 1);
INSERT INTO Player
VALUES (1013, 'Alexis Sanchez', 26, 'FW', 'Chile', 1);
INSERT INTO Player
VALUES (1014, 'Nacho Monreal', 29, 'DF', 'Spain', 1);
INSERT INTO Player
VALUES (1015, 'Santi Cazorla', 30, 'MF', 'Spain', 1);
INSERT INTO Player
VALUES (1016, 'Mathieu Flamini', 31, 'MF', 'France', 1);
INSERT INTO Player
VALUES (1017, 'Calum Chambers', 20, 'DF', 'England', 1);
INSERT INTO Player
VALUES (1018, 'Danny Welbeck', 24, 'FW', 'England', 1);
INSERT INTO Player
VALUES (1019, 'Francis Coquelin', 23, 'MF', 'France', 1);
INSERT INTO Player
VALUES (1020, 'Brad Guzan', 30, 'GK', 'United States', 2);
INSERT INTO Player
VALUES (1021, 'Nathan Baker', 23, 'DF', 'England', 2);
INSERT INTO Player
VALUES (1022, 'Joe Bennett', 24, 'DF', 'England', 2);
INSERT INTO Player
VALUES (1023, 'Ron Vlaar', 30, 'DF', 'Netherlands', 2);
INSERT INTO Player
VALUES (1024, 'Jores Okore', 22, 'DF', 'Denmark', 2);
INSERT INTO Player
VALUES (1025, 'Ciaran Clark', 25, 'DF', 'Ireland', 2);
INSERT INTO Player
VALUES (1026, 'Phillipe Senderos', 30, 'DF', 'Switzerland', 2);
INSERT INTO Player
VALUES (1027, 'Alan Hutton', 30, 'DF', 'Scotland', 2);
INSERT INTO Player
VALUES (1028, 'Aly Cissokho', 27, 'DF', 'France', 2);
INSERT INTO Player
VALUES (1029, 'Matthew Lowton', 25, 'DF', 'England', 2);
INSERT INTO Player
VALUES (1030, 'Leandro Bacuna', 23, 'MF', 'Netherlands', 2);
INSERT INTO Player
VALUES (1031, 'Tom Cleverley', 25, 'MF', 'England', 2);
INSERT INTO Player
VALUES (1032, 'Scott Sinclair', 25, 'MF', 'England', 2);
INSERT INTO Player
VALUES (1033, 'Fabian Delph', 25, 'MF', 'England', 2);
INSERT INTO Player
VALUES (1034, 'Ashley Westwood', 24, 'MF', 'England', 2);
INSERT INTO Player
VALUES (1035, 'Charles Nzogbia', 28, 'MF', 'France', 2);
INSERT INTO Player
VALUES (1036, 'Jack Grealish', 19, 'MF', 'Ireland', 2);
INSERT INTO Player
VALUES (1037, 'Andreas Weimann', 23, 'FW', 'Austria', 2);
INSERT INTO Player
VALUES (1038, 'Gabriel Agbonlahor', 28, 'FW', 'England', 2);
INSERT INTO Player
VALUES (1039, 'Christian Benteke', 24, 'FW', 'Belgium', 2);
INSERT INTO Player 
VALUES (1040, 'Adam Federici', 30, 'GK', 'Australia', 3);
INSERT INTO Player 
VALUES (1041, 'Chris Gunter', 25, 'DF', 'Wales', 3);
INSERT INTO Player 
VALUES (1042, 'Stephen Kelly', 31, 'DF', 'Ireland', 3);
INSERT INTO Player 
VALUES (1043, 'Alex Pearce', 26, 'DF', 'Ireland', 3);
INSERT INTO Player 
VALUES (1044, 'Michael Hector', 22, 'DF', 'England', 3);
INSERT INTO Player 
VALUES (1045, 'Oliver Norwood', 23, 'MF', 'Northern Ireland', 3);
INSERT INTO Player 
VALUES (1046, 'Danny Guthrie', 27, 'MF', 'England', 3);
INSERT INTO Player 
VALUES (1047, 'Hal Robson-Kanu', 25, 'MF', 'Wales', 3);
INSERT INTO Player 
VALUES (1048, 'Jordan Obita', 21, 'MF', 'England', 3);
INSERT INTO Player 
VALUES (1049, 'Garath McCleary', 27, 'MF', 'Jamaica', 3);
INSERT INTO Player 
VALUES (1050, 'Hope Akpan', 23, 'MF', 'Nigeria', 3);
INSERT INTO Player 
VALUES (1051, 'Jem Karacan', 26, 'MF', 'Turkey', 3);
INSERT INTO Player 
VALUES (1052, 'Danny Williams', 26, 'MF', 'USA', 3);
INSERT INTO Player 
VALUES (1053, 'Jake Taylor', 23, 'MF', 'Wales', 3);
INSERT INTO Player 
VALUES (1054, 'Pavel Pogrebnyak', 31, 'FW', 'Russia', 3);
INSERT INTO Player 
VALUES (1055, 'Simon Cox', 27, 'FW', 'Ireland', 3);
INSERT INTO Player 
VALUES (1056, 'Jamie Mackie', 29, 'FW', 'Scotland', 3);
INSERT INTO Player 
VALUES (1057, 'Nick Blackman', 25, 'FW', 'England', 3);
INSERT INTO Player 
VALUES (1058, 'Simon Mignolet', 27, 'GK', 'Belgium', 4);
INSERT INTO Player 
VALUES (1059, 'Glen Johnson', 30, 'DF', 'England', 4);
INSERT INTO Player 
VALUES (1060, 'José Enrique', 29, 'DF', 'Spain', 4);
INSERT INTO Player 
VALUES (1061, 'Kolo Touré', 33, 'DF', 'Ivory Coast', 4);
INSERT INTO Player 
VALUES (1062, 'Dejan Lovren', 25, 'DF', 'Croatia', 4);
INSERT INTO Player 
VALUES (1063, 'Mamadou Sakho', 25, 'DF', 'France', 4);
INSERT INTO Player 
VALUES (1064, 'Martin Skrtel', 30, 'DF', 'Slovakia', 4);
INSERT INTO Player 
VALUES (1065, 'Steven Gerrard', 34, 'MF', 'England', 4);
INSERT INTO Player 
VALUES (1066, 'Philippe Coutinho', 22, 'MF', 'Brazil', 4);
INSERT INTO Player 
VALUES (1067, 'Jordan Henderson', 24, 'MF', 'England', 4);
INSERT INTO Player 
VALUES (1068, 'Adam Lallana', 26, 'MF', 'England', 4);
INSERT INTO Player 
VALUES (1069, 'Emre Can', 21, 'MF', 'Germany', 4);
INSERT INTO Player 
VALUES (1070, 'Joe Allen', 25, 'MF', 'Wales', 4);
INSERT INTO Player 
VALUES (1071, 'Raheem Sterling', 20, 'MF', 'England', 4);
INSERT INTO Player 
VALUES (1072, 'Jordon Ibe', 19, 'MF', 'England', 4);
INSERT INTO Player 
VALUES (1073, 'Rickie Lambert', 33, 'FW', 'England', 4);
INSERT INTO Player 
VALUES (1074, 'Daniel Sturridge', 25, 'FW', 'England', 4);
INSERT INTO Player 
VALUES (1075, 'Fabio Borini', 23, 'FW', 'Italy', 4);
INSERT INTO Player 
VALUES (1076, 'Mario Balotelli', 24, 'FW', 'Italy', 4);

JDBC代码：

      // check whether dataSource was injected by the server
      if ( dataSource == null )
         throw new SQLException( "Unable to obtain DataSource" );

      // obtain a connection from the connection pool
      Connection connection = dataSource.getConnection();

      // check whether connection was successful
      if ( connection == null )
         throw new SQLException( "Unable to connect to DataSource" );

      try
      {
         // create a PreparedStatement to insert a new address book entry
         PreparedStatement addEntry =
            connection.prepareStatement( "INSERT INTO FAN " +
               "(USER_ID,USER_NAME,RESIDENT,SELECTED_TEAM)" +
               "VALUES ( ?, ?, ?, ? )" );

         // specify the PreparedStatement's arguments
         addEntry.setInt( 1, getUserID() );
         addEntry.setString( 2, getUserName() );
         addEntry.setString( 3, getResident() );
         addEntry.setInt( 4, getSelectedTeam() );       

         addEntry.executeUpdate(); // insert the entry

         addEntry = connection.prepareStatement( "UPDATE TEAM SET VOTES = VOTES + 1 "
                 + "WHERE TEAM_ID = " + getTeamID());
         addEntry.executeUpdate(); // insert the entry

         return "Prediction"; // go back to index.xhtml page
      } // end try
      finally
      {
         connection.close(); // return this connection to pool
      } // end finally
   } // end method save

    // return a ResultSet of entries
   public ResultSet getTeams() throws SQLException
   {
      // check whether dataSource was injected by the server
      if ( dataSource == null )
         throw new SQLException( "Unable to obtain DataSource" );

      // obtain a connection from the connection pool
      Connection connection = dataSource.getConnection();

      // check whether connection was successful
      if ( connection == null )
         throw new SQLException( "Unable to connect to DataSource" );

      try
      {
         // create a PreparedStatement to insert a new address book entry
         PreparedStatement getTeams = connection.prepareStatement(
            "SELECT TEAM_ID, TEAM_NAME, REGION, LEAGUE, MANAGER, VOTES " + 
                 "FROM TEAM");

         CachedRowSet rowSet = new com.sun.rowset.CachedRowSetImpl();
         rowSet.populate( getTeams.executeQuery() );
         return rowSet; 
      } // end try
      finally
      {
         connection.close(); // return this connection to pool
      } // end finally
   } // end method getAddresses

Answer 1

您可以在 Fan table table 中使用 trigger，当您添加新的粉丝触发器时，将检查 his/her 个选定的团队。

然后它将更新 Teams rable 列。触发器是解决这个问题的好而简单的方法。如果您需要更多帮助，请告诉我

Answer 2

CREATE TRIGGER [TRIGGER_ALTER_COUNT] ON [dbo].[tblExample] 
FOR INSERT, UPDATE
 AS
 BEGIN
  DECLARE @getSelectedTeamID  VARCHAR(36)
  SELECT @SelectedTeamID = getSelectedTeam FROM INSERTED
  UPDATE [dbo].[YourTeamsTblExample] SET VoteCount = VoteCount + 1 

  WHERE SelectedTeamID = @getSelectedTeamID

结束

Answer 3

addEntry = 
           connection.prepareStatement( "UPDATE TEAM SET VOTES = VOTES + 1 "
                 + "WHERE TEAM_ID =" + getTeamID());
         addEntry.executeUpdate(); // insert the entry

SQL Java 更新记录问题

SQL Java Update record issue

java

mysql

jdbc