获取超过255个字符的列时出现Sybase错误

时间:2010-02-09 07:27:43

标签: database data-binding sybase

从具有超过255个字符的列中提取数据时遇到问题

我收到了这样的错误消息:

  

Open Client Message:
  消息号:LAYER =(1)ORIGIN =(4)SEVERITY =(1)NUMBER =(132)
  消息字符串:ct_fetch():用户api层:内部公共库错误:结果集项3的绑定导致截断。

它仅获取前255行并截断其余行。

我试图在ct_connect之前暗示下面的行但是没有用

CS_BOOL boolv = CS_TRUE;
CS_RETCODE  retcode2 = ct_capability ( *connection, CS_GET, CS_CAP_REQUEST,    CS_WIDETABLES, &boolv);

这里是代码的一部分,你有什么建议

for (i = 0; i < num_cols; i++) {
        /*
         ** Get the column description.  ct_describe() fills the
         ** datafmt parameter with a description of the column.
         */
        retcode = ct_describe(cmd, (i + 1), &datafmt[i]);
        if (retcode != CS_SUCCEED) {
            ex_error("ex_fetch_data: ct_describe() failed");
            break;
        }

        /*
         ** update the datafmt structure to indicate that we want the
         ** results in a null terminated character string.
         **
         ** First, update datafmt.maxlength to contain the maximum
         ** possible length of the column. To do this, call
         ** ex_display_len() to determine the number of bytes needed
         ** for the character string representation, given the
         ** datatype described above.  Add one for the null
         ** termination character.
         */
        datafmt[i].maxlength = ex_display_dlen(&datafmt[i]) + 1;

        /*
         ** Set datatype and format to tell bind we want things
         ** converted to null terminated strings
         */
        datafmt[i].datatype = CS_LONGCHAR_TYPE;
        datafmt[i].format = CS_FMT_NULLTERM;

        /*
         ** Allocate memory for the column string
         */
        coldata[i].value = (CS_CHAR *) malloc(datafmt[i].maxlength);
        if (coldata[i].value == NULL) {
            ex_error("ex_fetch_data: malloc() failed");
            retcode = CS_MEM_ERROR;
            break;
        }

        /*
         ** Now bind.
         */
        retcode = ct_bind(cmd, (i + 1), &datafmt[i], coldata[i].value,
                &coldata[i].valuelen, (CS_SMALLINT *) &coldata[i].indicator);
        if (retcode != CS_SUCCEED) {
            ex_error("ex_fetch_data: ct_bind() failed");
            break;
        }
    }


.............
.............
.............

    /*
     ** Fetch the rows.  Loop while ct_fetch() returns CS_SUCCEED or
     ** CS_ROW_FAIL
     */
    while (((retcode = ct_fetch(cmd, CS_UNUSED, CS_UNUSED, CS_UNUSED,
            &rows_read)) == CS_SUCCEED) || (retcode == CS_ROW_FAIL)) {

2 个答案:

答案 0 :(得分:0)

即使我们在使用Sybase和Uniface时遇到问题,但是uniface sybase驱动程序有一个选项可以截断数据并保存在其他表中,但在获取时我们必须从所有表中获取数据。

答案 1 :(得分:0)

使用本机jconn * .jar驱动程序时,必须在JDBC驱动程序上设置“?CHARSET = iso_1”参数,以使用默认字符集Roman 8连接到Sybase服务器,否则会看到此255个字符的截断问题

这可能是您遇到的问题吗?