Question

我的应用程序使用TimesTen DB来存储数据。下面是我更新数据并返回更新行的代码。

conn = new OracleConnection("My Connection");
conn.Open();
OracleTransaction tran = conn.BeginTransaction(IsolationLevel.ReadCommitted);
OracleCommand command = new OracleCommand();

command = new OracleCommand(@"DECLARE idNo NUMBER;
BEGIN
select id into idNo from " + prefix_db + @"tbl_request_in where upper(status)='PENDING' and ROWNUM <= 1 order by priority, id FOR update;
update " + prefix_db + @"tbl_request_in set status ='Processing',begin_time= SYSDATE(),response_node='10.9.70.47' 
where upper(status) <> 'PROCESS' and upper(status) <> 'PROCESSING' and upper(status) <> 'OK' and upper(status)<>'ERROR' 
and id=idNo;
OPEN :RETURNCURSOR for select * from APITT_tbl_request_in where id=idNo;
END;", conn);

command.Transaction = tran;
command.BindByName = true;
OracleParameter outNumPrm = command.Parameters.Add("RETURNCURSOR", OracleDbType.RefCursor, DBNull.Value, ParameterDirection.ReturnValue);

// create a data adapter to use with the data set
OracleDataAdapter da = new OracleDataAdapter(command);

// create the data set
DataSet ds = new DataSet();

// fill the data set
da.Fill(ds);

我给错误

{Oracle.DataAccess.Client.OracleException ORA-01722：无效的号码
在Oracle.DataAccess.Client.OracleException.HandleErrorHelper（Int32 errCode，OracleConnection conn，IntPtr opsErrCtx，OpoSqlValCtx * pOpoSqlValCtx，Object src，String procedure，Boolean bCheck） at Oracle.DataAccess.Client.OracleException.HandleError（Int32 errCode，OracleConnection conn，IntPtr opsErrCtx，Object src，Boolean B检查）在Oracle.DataAccess.Client.OracleDataReader.Read（）在System.Data.Common.DataAdapter.FillLoadDataRow（SchemaMapping mapping）在System.Data.Common.DataAdapter.FillFromReader（DataSet数据集，DataTable数据表，String srcTable，DataReaderContainer） dataReader，Int32 startRecord，Int32 maxRecords，DataColumn parentChapterColumn，Object parentChapterValue）在System.Data.Common.DataAdapter.Fill（DataSet dataSet，String srcTable，IDataReader dataReader，Int32 startRecord，Int32 maxRecords）在Oracle.DataAccess.Client.OracleDataAdapter.Fill（DataSet dataSet，String srcTable，IDataReader dataReader，Int32 startRecord， Int32 maxRecords）在Oracle.DataAccess.Client.OracleDataAdapter.Fill（DataSet dataSet，Int32 startRecord，Int32 maxRecords，String srcTable， IDbCommand命令，CommandBehavior行为）在System.Data.Common.DbDataAdapter.Fill（DataSet dataSet）

我该如何解决？

Answer 1

匿名PL / SQL块不能返回任何值。写一个这样的函数：

CREATE OR REPLACE FUNCTION APITT_tbl_request(prefix_db IN VARCHAR2) RETURN SYS_REFCURSOR AS
    idNo NUMBER;
    res SYS_REFCURSOR;
BEGIN
    EXECUTE IMMEDIATE 'SELECT ID ' 
        ||'FROM '|| prefix_db || 'tbl_request_in '
        ||'WHERE UPPER(status)=''PENDING'' AND ROWNUM <= 1 ORDER BY priority, ID FOR UPDATE' 
    INTO idNo;

    EXECUTE IMMEDIATE 'UPDATE '|| prefix_db || 'tbl_request_in SET status =''Processing'', begin_time= :bt, response_node=''10.9.70.47'' ' 
        ||'WHERE UPPER(status) <> ''PROCESS'' AND UPPER(status) <> ''PROCESSING'' AND UPPER(status) <> ''OK'' AND UPPER(status)<>''ERROR'' AND ID= :id'
    USING SYSDATE,  idNo

    OPEN res FOR SELECT * FROM APITT_tbl_request_in WHERE ID=idNo;
    RETURN res;
END;

并将此函数称为

DataTable dt = new DataTable();
OracleCommand command = new OracleCommand(@"BEGIN :RETURNCURSOR := APITT_tbl_request(:prefix_db); END;");
command.CommandType = CommandType.Text;
command.Parameters.Add("RETURNCURSOR", OracleDbType.RefCursor, ParameterDirection.ReturnValue);
command.Parameters.Add("prefix_db", OracleDbType.Varchar2, ParameterDirection.Input).Value = prefix_db;
OracleDataAdapter da = new OracleDataAdapter(command);
da.Fill(dt);

如果您无法在数据库中创建该函数，请尝试将字符串APITT_tbl_request(:prefix_db);替换为函数体，但我不知道这是否有效。

ODP.NET：如何从动态sql获取数据到数据集

1 个答案: