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Gets a string chunk from the column.
public virtual size_t GetStringChunk(
const char * cname,
char * dst,
The name of the column.
The buffer to hold the string chunk. The string is null-terminated even if truncated.
The size of the buffer in bytes.
The offset into the value at which to start reading or UL_BLOB_CONTINUE to continue from where the last read ended.
The number of bytes copied to the destination buffer excluding the null-terminator. If dst is NULL, the number of bytes left
in the string is returned.
The end of the value has been reached if 0 is returned.