Question

如何在JDBC上为Microsoft SQL Server设置AllowMultipleQueries？

我的连接字符串当前正在关注，但它不起作用。

private final String url = "jdbc:sqlserver://localhost:11435;databaseName=myDatabase;allowMultiQueries=true";

Answer 1

使用Microsoft的SQL Server JDBC驱动程序，您不需要为连接URL添加任何特殊内容，以便在单个execute中启用多个语句。这很好用：

connectionUrl = "jdbc:sqlserver://localhost:52865;databaseName=myDb";
try (Connection conn = DriverManager.getConnection(connectionUrl, myUserID, myPassword)) {
    System.out.printf("Driver version %s%n", conn.getMetaData().getDriverVersion());

    try (Statement st = conn.createStatement()) {
        st.execute("CREATE TABLE #test (id INT IDENTITY PRIMARY KEY, textcol NVARCHAR(50))");
    }

    String[] itemsToInsert = new String[] { "foo", "bar" };

    String sql = 
            "SET NOCOUNT ON;" +
            "INSERT INTO #test (textcol) VALUES (?);" +
            "SELECT @@IDENTITY;";
    try (PreparedStatement ps = conn.prepareStatement(sql)) {
        for (String item : itemsToInsert) {
            ps.setString(1, item);
            try (ResultSet rs = ps.executeQuery()) {
                rs.next();
                int newId = rs.getInt(1);
                System.out.printf("'%s' inserted with id=%d%n", item, newId);
            }
        }
    }

} catch (Exception e) {
    e.printStackTrace(System.err);
}

制造

Driver version 6.0.7728.100
'foo' inserted with id=1
'bar' inserted with id=2

但是，在这种特殊情况下，最好使用JDBC的内置支持来检索生成的密钥：

String sql = "INSERT INTO #test (textcol) VALUES (?)";
try (PreparedStatement ps = conn.prepareStatement(sql, PreparedStatement.RETURN_GENERATED_KEYS)) {
    for (String item : itemsToInsert) {
        ps.setString(1, item);
        ps.executeUpdate();
        try (ResultSet rs = ps.getGeneratedKeys()) {
            rs.next();
            int newId = rs.getInt(1);
            System.out.printf("'%s' inserted with id=%d%n", item, newId);
        }
    }
}

产生完全相同的结果。

Answer 2

为什么不使用存储过程呢？您应该使用下面的存储过程

，而不是设置allowMultiQueries

create procedure usp_data
as
begin
INSERT INTO ......; 
SELECT @@IDENTITY AS [id];
end

现在从后面的代码中调用该存储过程。如果需要，您也可以参数化该过程。请参阅此现有帖子Multiple queries executed in java in single statement

JDBC＆amp; Microsoft SQL Server /如何设置AllowMultipleQueries

2 个答案: