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CentOS 7.0 - man page for spi_prepare_params (centos section 3)

SPI_PREPARE_PARAMS(3)					  PostgreSQL 9.2.7 Documentation				     SPI_PREPARE_PARAMS(3)

SPI_prepare_params - prepare a statement, without executing it yet
SPIPlanPtr SPI_prepare_params(const char * command, ParserSetupHook parserSetup, void * parserSetupArg, int cursorOptions)
SPI_prepare_params creates and returns a prepared statement for the specified command, but doesn't execute the command. This function is equivalent to SPI_prepare_cursor, with the addition that the caller can specify parser hook functions to control the parsing of external parameter references.
const char * command command string ParserSetupHook parserSetup Parser hook setup function void * parserSetupArg passthrough argument for parserSetup int cursorOptions integer bit mask of cursor options; zero produces default behavior
SPI_prepare_params has the same return conventions as SPI_prepare. PostgreSQL 9.2.7 2014-02-17 SPI_PREPARE_PARAMS(3)