UniBasic Commands Reference - Rocket Software

EDADRV_PrepareStmt
Syntax
RETCODE EDADRV_PrepareStmt(connhdl,stmthdl,stmt)
Description
The EDADRV_PrepareStmt function prepares a statement passed to it by EDA. If the
driver already has a statement handle that it can reuse, it may choose to return this
preallocated handle in the stmthdl output variable, otherwise, it allocates a new
statement handle and returns it in stmthdl.
If the statement is a DDL statement (statement type EDASTMT_DDL) or a DML
statement, such as INSERT, UPDATE or DELETE (statement type
EDASTMT_DML), or a SELECT statement (statement type EDASTMT_QUERY),
the statement may contain input parameters. These parameters are designated by
parameter markers (“?”). In this case, EDA supplies as many parameter descriptions
as there are parameter markers.
If the statement is a stored procedure call (statement type
EDASTMT_PROCEDURE), the statement may contain input, output, and
input/output parameters (parameter types of EDAPARAM_IN, EDAPARAM_OUT,
and EDAPARAM_INOUT). In this case, EDA supplies as many parameter descriptions
as there are input and input/output parameters of a stored procedure.
The EDADRV_PrepareStmt function allocates an array of EDA_T_PTYPE structures,
converts EDA data type into the corresponding external database data type, and
associates this array with the statement handle for its later use in
EDADRV_ExecuteStmt.
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