如何在JDBC中获取插入ID？

我想使用Java中的JDBC在数据库（在我的情况下为Microsoft SQL Server）中INSERT一条记录。同时，我想获取插入ID。如何使用JDBC API实现此目的？

#1楼

我正在使用SQLServer 2008，但是我有一个开发限制：我不能使用新的驱动程序，必须使用“ com.microsoft.jdbc.sqlserver.SQLServerDriver”（我不能使用“ com.microsoft.sqlserver.jdbc” .SQLServerDriver”）。

这就是为什么解决方案conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)为我抛出java.lang.AbstractMethodError的原因。在这种情况下，我发现一种可能的解决方案是Microsoft建议的旧解决方案：如何使用JDBC检索@@ IDENTITY值

import java.sql.*; 
import java.io.*; 

public class IdentitySample
{
    public static void main(String args[])
    {
        try
        {
            String URL = "jdbc:microsoft:sqlserver://yourServer:1433;databasename=pubs";
            String userName = "yourUser";
            String password = "yourPassword";

            System.out.println( "Trying to connect to: " + URL); 

            //Register JDBC Driver
            Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();

            //Connect to SQL Server
            Connection con = null;
            con = DriverManager.getConnection(URL,userName,password);
            System.out.println("Successfully connected to server"); 

            //Create statement and Execute using either a stored procecure or batch statement
            CallableStatement callstmt = null;

            callstmt = con.prepareCall("INSERT INTO myIdentTable (col2) VALUES (?);SELECT @@IDENTITY");
            callstmt.setString(1, "testInputBatch");
            System.out.println("Batch statement successfully executed"); 
            callstmt.execute();

            int iUpdCount = callstmt.getUpdateCount();
            boolean bMoreResults = true;
            ResultSet rs = null;
            int myIdentVal = -1; //to store the @@IDENTITY

            //While there are still more results or update counts
            //available, continue processing resultsets
            while (bMoreResults || iUpdCount!=-1)
            {           
                //NOTE: in order for output parameters to be available,
                //all resultsets must be processed

                rs = callstmt.getResultSet();                   

                //if rs is not null, we know we can get the results from the SELECT @@IDENTITY
                if (rs != null)
                {
                    rs.next();
                    myIdentVal = rs.getInt(1);
                }                   

                //Do something with the results here (not shown)

                //get the next resultset, if there is one
                //this call also implicitly closes the previously obtained ResultSet
                bMoreResults = callstmt.getMoreResults();
                iUpdCount = callstmt.getUpdateCount();
            }

            System.out.println( "@@IDENTITY is: " + myIdentVal);        

            //Close statement and connection 
            callstmt.close();
            con.close();
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }

        try
        {
            System.out.println("Press any key to quit...");
            System.in.read();
        }
        catch (Exception e)
        {
        }
    }
}

这个解决方案对我有用！

我希望这有帮助！

#2楼

如果它是自动生成的密钥，则可以为此使用Statement#getGeneratedKeys() 。您需要在与用于INSERT Statement相同的Statement上调用它。首先，您需要使用Statement.RETURN_GENERATED_KEYS创建Statement.RETURN_GENERATED_KEYS以通知JDBC驱动程序返回键。

这是一个基本示例：

public void create(User user) throws SQLException {
    try (
        Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(SQL_INSERT,
                                      Statement.RETURN_GENERATED_KEYS);
    ) {
        statement.setString(1, user.getName());
        statement.setString(2, user.getPassword());
        statement.setString(3, user.getEmail());
        // ...

        int affectedRows = statement.executeUpdate();

        if (affectedRows == 0) {
            throw new SQLException("Creating user failed, no rows affected.");
        }

        try (ResultSet generatedKeys = statement.getGeneratedKeys()) {
            if (generatedKeys.next()) {
                user.setId(generatedKeys.getLong(1));
            }
            else {
                throw new SQLException("Creating user failed, no ID obtained.");
            }
        }
    }
}

请注意，您是否依赖JDBC驱动程序。当前，大多数最新版本都可以使用，但是如果我没错，Oracle JDBC驱动程序仍然有些麻烦。 MySQL和DB2已经支持它很久了。 PostgreSQL不久前就开始支持它。我从未评论过MSSQL，因为我从未使用过它。

对于Oracle，可以在同一事务中的INSERT之后直接使用RETURNING子句或SELECT CURRVAL(sequencename) （或执行此操作的任何特定于DB的语法SELECT CURRVAL(sequencename)调用CallableStatement ，以获取最后生成的密钥。另请参阅此答案。

#3楼

使用Statement.RETURN_GENERATED_KEYS时遇到“不受支持的功能”错误，请尝试以下操作：

    String[] returnId = { "BATCHID" };
    String sql = "INSERT INTO BATCH (BATCHNAME) VALUES ('aaaaaaa')";
    PreparedStatement statement = connection
            .prepareStatement(sql, returnId);
    int affectedRows = statement.executeUpdate();

    if (affectedRows == 0) {
        throw new SQLException("Creating user failed, no rows affected.");
    }

    try (ResultSet rs = statement.getGeneratedKeys()) {
        if (rs.next()) {
            System.out.println(rs.getInt(1));
        }
        rs.close();

    }

其中BATCHID是自动生成的ID。

#4楼

创建生成的列
```
String generatedColumns[] = { "ID" };
```

将此生成的列传递给您的声明

PreparedStatement stmtInsert = conn.prepareStatement(insertSQL, generatedColumns);

使用ResultSet对象在Statement上获取GeneratedKeys

ResultSet rs = stmtInsert.getGeneratedKeys(); if (rs.next()) { long id = rs.getLong(1); System.out.println("Inserted ID -" + id); // display inserted record }

#5楼

Connection cn = DriverManager.getConnection("Host","user","pass");
Statement st = cn.createStatement("Ur Requet Sql");
int ret  = st.execute();

来源：oschina

链接：https://my.oschina.net/u/3797416/blog/3167914

标签

SQL Server

OpenSSL

java

Oracle

sqlserver