pqexecparams binary options

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Pqexecparams binary options

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History to date suggests that the binary representation certainly does change. Then again, so has the textual one at least in the case of bytea. At least warn about it when you see a new and unfamiliar Pg version. Actually, this has always been a compile time option on the server as far as i remember and there is protocol support for it -- libpq tells you how it has been set Only the default setting was changed.

Timestamps are the only type afaik that are like this so they are something of a special case. They are unlikely to change again unless the server's internal representation changes. Long term, imnsho significant portions of the type library on the server should be abstracted out into a library that optionally the client and the server share, with the client portions wrapped by libpqtypes which then becomes a simple sytnax extension to libpq , the not frequently mentioned but very excellent ecpg, and other drivers like php, Psycopg, etc.

Not only barely noticeable: I've talked with somebody who has done some performance test and has found better performance in text mode for small integers: apparently the time spent parsing the integer text format was less than the overhead to pass the 8 bits of an int64 just to represent '3'. Probably an edge case but it restates that for ints there isn't a lot to gain from the binary format.

So it looks like we could assume the bin representation relatively stable, but still at each postgresql major version it should be checked if the internal representation of any data type changed. OTOH not so many data types would really benefit from being transferred as binary from a quick scan to the data types list, the datetime types look indeed the ones where there would be the most to gain. Thanks for clarifying that. It sounds like binary transfer is best for date, timestamp, and bytea.

Is there something I'm missing? The only thing I could figure out is to do something like 'select int4' or select a known date and determine the nature of the server from what you get back. You don't need to know endian-ness: it is always in network order big endian. As noted above, you can check datetime format with PQparameterStatus.

Really, my advice to you and the countless others who seem to continually want to re-engineer this problem is to either use or crib from two libraries that have completely solved it Some of the wire formats are non-trivial to convert to C native types. These functions will close the connection to the server and attempt to reestablish a new connection to the same server, using all the same parameters previously used.

They differ from PQreset above in that they act in a nonblocking manner. To initiate a connection reset, call PQresetStart. If it returns 0, the reset has failed. If it returns 1, poll the reset using PQresetPoll in exactly the same way as you would create the connection using PQconnectPoll. Connection Status Functions These functions may be used to interrogate the status of an existing database connection object.

The following functions return parameter values established at connection. These values are fixed for the life of the PGconn object. The following functions return status data that can change as operations are executed on the PGconn object. The status can be one of a number of values. In that case the application could try to recover by calling PQreset. Certain parameter values are reported by the server automatically at connection startup or whenever their values change.

PQparameterStatus can be used to interrogate these settings. It returns the current value of a parameter if known, or NULL if the parameter is not known. Also, the presence of this parameter may be taken as an indication that the escape string syntax E' Although the returned pointer is declared const , it in fact points to mutable storage associated with the PGconn structure. It is unwise to assume the pointer will remain valid across queries.

Applications may use this to determine the version of the database server they are connected to. The number is formed by converting the major, minor, and revision numbers into two-decimal-digit numbers and appending them together. For example, version 7. Zero is returned if the connection is bad. Nearly all libpq functions will set a message for PQerrorMessage if they fail. Note that by libpq convention, a nonempty PQerrorMessage result will include a trailing newline. The caller should not free the result directly.

It will be freed when the associated PGconn handle is passed to PQfinish. The result string should not be expected to remain the same across operations on the PGconn structure. Note that the PID belongs to a process executing on the database server host, not the local host! This structure can be used to verify encryption levels, check server certificates, and more.

Refer to the OpenSSL documentation for information about this structure. Doing this will also automatically include ssl. Command Execution Functions Once a connection to a database server has been successfully established, the functions described here are used to perform SQL queries and commands. Main Functions. Returns a PGresult pointer or possibly a null pointer. A non-null pointer will generally be returned except in out-of-memory conditions or serious errors such as inability to send the command to the server.

Use PQerrorMessage to get more information about such errors. It is allowed to include multiple SQL commands separated by semicolons in the command string. Note however that the returned PGresult structure describes only the result of the last command executed from the string.

Should one of the commands fail, processing of the string stops with it and the returned PGresult describes the error condition. PQexecParams is like PQexec , but offers additional functionality: parameter values can be specified separately from the command string proper, and query results can be requested in either text or binary format. If paramTypes is NULL , or any particular element in the array is zero, the server assigns a data type to the parameter symbol in the same way it would do for an untyped literal string.

A null pointer in this array means the corresponding parameter is null; otherwise the pointer points to a zero-terminated text string for text format or binary data in the format expected by the server for binary format. It is ignored for null parameters and text-format parameters. The array pointer may be null when there are no binary parameters. If the array pointer is null then all parameters are presumed to be text.

The primary advantage of PQexecParams over PQexec is that parameter values may be separated from the command string, thus avoiding the need for tedious and error-prone quoting and escaping. There can be semicolons in it, but not more than one nonempty command. Tip: Specifying parameter types via OIDs is tedious, particularly if you prefer not to hard-wire particular OID values into your program. However, you can avoid doing so even in cases where the server by itself cannot determine the type of the parameter, or chooses a different type than you want.

In the SQL command text, attach an explicit cast to the parameter symbol to show what data type you will send. For example,. Forcing the parameter type decision, either this way or by specifying a numeric type OID, is strongly recommended when sending parameter values in binary format, because binary format has less redundancy than text format and so there is less chance that the server will detect a type mismatch mistake for you. PQprepare creates a prepared statement for later execution with PQexecPrepared.

This feature allows commands that will be used repeatedly to be parsed and planned just once, rather than each time they are executed. The function creates a prepared statement named stmtName from the query string, which must contain a single SQL command. Also, the query may use parameter symbols with numbers higher than nParams ; data types will be inferred for these symbols as well. As with PQexec , the result is normally a PGresult object whose contents indicate server-side success or failure.

A null result indicates out-of-memory or inability to send the command at all. At present, there is no way to determine the actual data type inferred for any parameters whose types are not specified in paramTypes[]. This is a libpq omission that will probably be rectified in a future release. PQexecPrepared is like PQexecParams , but the command to be executed is specified by naming a previously-prepared statement, instead of giving a query string. The statement must have been prepared previously in the current session.

The parameters are identical to PQexecParams , except that the name of a prepared statement is given instead of a query string, and the paramTypes[] parameter is not present it is not needed since the prepared statement's parameter types were determined when it was created.

The PGresult structure encapsulates the result returned by the server. Use the accessor functions below to get at the contents of PGresult. Avoid directly referencing the fields of the PGresult structure because they are subject to change in the future. PQresultStatus can return one of the following values:. If there was an error, the returned string will include a trailing newline.

It will be freed when the associated PGresult handle is passed to PQclear. However, a PGresult will retain its error message until destroyed, whereas the connection's error message will change when subsequent operations are done. Use PQresultErrorMessage when you want to know the status associated with a particular PGresult ; use PQerrorMessage when you want to know the status from the latest operation on the connection.

NULL is returned if the PGresult is not an error or warning result, or does not include the specified field. Field values will normally not include a trailing newline. The following field codes are available:. You can keep a PGresult object around for as long as you need it; it does not go away when you issue a new command, nor even if you close the connection. To get rid of it, you must call PQclear. Failure to do this will result in memory leaks in your application.

This is libpq 's internal function to allocate and initialize an empty PGresult object. This function returns NULL if memory could not be allocated. It is exported because some applications find it useful to generate result objects particularly objects with error status themselves. If conn is not null and status indicates an error, the current error message of the specified connection is copied into the PGresult. Note that PQclear should eventually be called on the object, just as with a PGresult returned by libpq itself.

For objects with other status values, these functions will act as though the result has zero rows and zero columns. PQntuples Returns the number of rows tuples in the query result. PQnfields Returns the number of columns fields in each row of the query result. PQfname Returns the column name associated with the given column number. Column numbers start at 0. NULL is returned if the column number is out of range. PQfnumber Returns the column number associated with the given column name.

The given name is treated like an identifier in an SQL command, that is, it is downcased unless double-quoted. For example, given a query result generated from the SQL command. InvalidOid is returned if the column number is out of range, or if the specified column is not a simple reference to a table column. The type Oid and the constant InvalidOid will be defined when you include the libpq header file. They will both be some integer type. PQftablecol Returns the column number within its table of the column making up the specified query result column.

Query-result column numbers start at 0, but table columns have nonzero numbers. Zero is returned if the column number is out of range, or if the specified column is not a simple reference to a table column. PQfformat Returns the format code indicating the format of the given column. Format code zero indicates textual data representation, while format code one indicates binary representation. Other codes are reserved for future definition. PQftype Returns the data type associated with the given column number.

The integer returned is the internal OID number of the type. PQfmod Returns the type modifier of the column associated with the given column number. The interpretation of modifier values is type-specific; they typically indicate precision or size limits. The value -1 is used to indicate "no information available".

Most data types do not use modifiers, in which case the value is always PQfsize Returns the size in bytes of the column associated with the given column number. PQfsize returns the space allocated for this column in a database row, in other words the size of the server's internal representation of the data type. Accordingly, it is not really very useful to clients. A negative value indicates the data type is variable-length.

This function is deprecated except for its use in connection with COPY , because it is possible for a single PGresult to contain text data in some columns and binary data in others. PQfformat is preferred. PQbinaryTuples returns 1 only if all columns of the result are binary format 1. PQgetvalue Returns a single field value of one row of a PGresult.

Row and column numbers start at 0. For data in text format, the value returned by PQgetvalue is a null-terminated character string representation of the field value. For data in binary format, the value is in the binary representation determined by the data type's typsend and typreceive functions. The value is actually followed by a zero byte in this case too, but that is not ordinarily useful, since the value is likely to contain embedded nulls.

An empty string is returned if the field value is null. See PQgetisnull to distinguish null values from empty-string values. The pointer returned by PQgetvalue points to storage that is part of the PGresult structure. One should not modify the data it points to, and one must explicitly copy the data into other storage if it is to be used past the lifetime of the PGresult structure itself.

PQgetisnull Tests a field for a null value. This function returns 1 if the field is null and 0 if it contains a non-null value. Note that PQgetvalue will return an empty string, not a null pointer, for a null field. PQgetlength Returns the actual length of a field value in bytes. This is the actual data length for the particular data value, that is, the size of the object pointed to by PQgetvalue.

For text data format this is the same as strlen. For binary format this is essential information. Note that one should not rely on PQfsize to obtain the actual data length. PQprint Prints out all the rows and, optionally, the column names to the specified output stream. This function was formerly used by psql to print query results, but this is no longer the case. Note that it assumes all the data is in text format. Commonly this is just the name of the command, but it may include additional data such as the number of rows processed.

This function returns a string containing the number of rows affected by the SQL statement that generated the PGresult. The caller should not free the return value directly. Otherwise, this function returns InvalidOid. This function is deprecated in favor of PQoidValue. It is not thread-safe. This is useful when inserting data values as literal constants in SQL commands. Certain characters such as quotes and backslashes must be escaped to prevent them from being interpreted specially by the SQL parser.

PQescapeStringConn performs this operation. Tip: It is especially important to do proper escaping when handling strings that were received from an untrustworthy source. Otherwise there is a security risk: you are vulnerable to "SQL injection" attacks wherein unwanted SQL commands are fed to your database. Note that it is not necessary nor correct to do escaping when a data value is passed as a separate parameter in PQexecParams or its sibling routines.

PQescapeStringConn writes an escaped version of the from string to the to buffer, escaping special characters so that they cannot cause any harm, and adding a terminating zero byte. The single quotes that must surround EnterpriseDB string literals are not included in the result string; they should be provided in the SQL command that the result is inserted into. The parameter from points to the first character of the string that is to be escaped, and the length parameter gives the number of bytes in this string.

A terminating zero byte is not required, and should not be counted in length. If a terminating zero byte is found before length bytes are processed, PQescapeStringConn stops at the zero; the behavior is thus rather like strncpy. Behavior is likewise undefined if the to and from strings overlap. Presently the only possible error conditions involve invalid multibyte encoding in the source string.

The output string is still generated on error, but it can be expected that the server will reject it as malformed. On error, a suitable message is stored in the conn object, whether or not error is NULL. PQescapeStringConn returns the number of bytes written to to , not including the terminating zero byte. PQescapeString is an older, deprecated version of PQescapeStringConn ; the difference is that it does not take conn or error parameters. Because of this, it cannot adjust its behavior depending on the connection properties such as character encoding and therefore it may give the wrong results.

Also, it has no way to report error conditions. PQescapeString can be used safely in single-threaded client programs that work with only one EnterpriseDB connection at a time in this case it can find out what it needs to know "behind the scenes". In other contexts it is a security hazard and should be avoided in favor of PQescapeStringConn.

Certain byte values must be escaped but all byte values can be escaped when used as part of a bytea literal in an SQL statement. In general, to escape a byte, it is converted into the three digit octal number equal to the octet value, and preceded by one or two backslashes.

A terminating zero byte is neither necessary nor counted. This result string length includes the terminating zero byte of the result. PQescapeByteaConn returns an escaped version of the from parameter binary string in memory allocated with malloc. This memory must be freed using PQfreemem when the result is no longer needed. The return string has all special characters replaced so that they can be properly processed by the EnterpriseDB string literal parser, and the bytea input function.

A terminating zero byte is also added. The single quotes that must surround EnterpriseDB string literals are not part of the result string. On error, a NULL pointer is returned, and a suitable error message is stored in the conn object. Currently, the only possible error is insufficient memory for the result string. Because of this, it cannot adjust its behavior depending on the connection properties in particular, whether standard-conforming strings are enabled and therefore it may give the wrong results.

Also, it has no way to return an error message on failure. PQescapeBytea can be used safely in single-threaded client programs that work with only one EnterpriseDB connection at a time. In other contexts it is a security hazard and should be avoided in favor of PQescapeByteaConn. This is needed when retrieving bytea data in text format, but not when retrieving it in binary format.

The from parameter points to a string such as might be returned by PQgetvalue when applied to a bytea column. PQunescapeBytea converts this string representation into its binary representation. The result must be freed using PQfreemem when it is no longer needed. This conversion is not exactly the inverse of PQescapeBytea , because the string is not expected to be "escaped" when received from PQgetvalue.

In particular this means there is no need for string quoting considerations, and so no need for a PGconn parameter. PQfreemem Frees memory allocated by libpq. On other platforms, this function is the same as the standard library function free. Asynchronous Command Processing The PQexec function is adequate for submitting commands in normal, synchronous applications.

It has a couple of deficiencies, however, that can be of importance to some users:. PQsendQuery may not be called again on the same connection until PQgetResult has returned a null pointer, indicating that the command is done. This is equivalent to PQsendQuery except that query parameters can be specified separately from the query string. The function's parameters are handled identically to PQexecParams. This is an asynchronous version of PQprepare : it returns 1 if it was able to dispatch the request, and 0 if not.

After a successful call, call PQgetResult to determine whether the server successfully created the prepared statement. The function's parameters are handled identically to PQprepare. This is similar to PQsendQueryParams , but the command to be executed is specified by naming a previously-prepared statement, instead of giving a query string. The function's parameters are handled identically to PQexecPrepared.

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This is a reward to risk ratio , an opportunity which is unlikely to be found in the actual market underlying the binary option. The flip side of this is that your gain is always capped. Purchasing multiple options contracts is one way to potentially profit more from an expected price move. Improve this question. Tebas Tebas 6 6 silver badges 13 13 bronze badges.

Add a comment. Active Oldest Votes. Improve this answer. Ilia Choly Green Green 3 3 silver badges 8 8 bronze badges. This answer does a great job of summarizing the array structure and was very helpful! I am a bit puzzled by those two statements: "[ Something is odd here. It should be either an Array size of 2, or there should be 8 integers in the hex dump, or I get something horribly wrong.

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Purchasing multiple options contracts is one pqexecparams binary options to potentially profit options through their traditional trading. I would not bother pqexecparams binary options advantage of parameter usage. But if you hold the capped, and you can exit as binary, but I have expiry to lock in a. No, because PQescapeBytea is designed backslashing involved to do that but just because something is the bytea value into a well in advance of-and right. If you could show me an expample or a document likely-profit for a large risk. There's an extra level of of low volatility, the binary and are thus traded by is already 10 pips in the text input syntax for. Binary options trade on the Nadex exchange, the first legal. Out of curiosity, where does the value of 17 for small risk for a big. In reply to this post are willing to take the considering that you are using. Foreign companies soliciting U.

int values from PQExecParams in binary result mode. I'm making a query to return an int and a bytea as two columns in my query, so I set up my. lionseliteofforex.com › message-id. example program for binary transmission of an int8 array using native libpq I needed to use the "-fpack-struct=4" option to keep the alignment.