SQLPrepare

Description

Prepares an SQL statement to be executed.

Note that the prepared statements sent by ODBC do not support the kernel reuse plan. As a result, a new plan needs to be generated for each execution, causing high CPU usage. If services have requirements on plan reuse, you are advised to use the JDBC client.

Prototype

    
         SQLRETURN SQLPrepare(SQLHSTMT      StatementHandle,    
                     SQLCHAR       *StatementText,     
                     SQLINTEGER    TextLength);

Parameters

**Table 1** SQLPrepare parameters
Keyword	Description
StatementHandle	Statement handle.
StatementText	SQL text string.
TextLength	Length of StatementText.

Return Values

SQL_SUCCESS indicates that the call succeeded.
SQL_SUCCESS_WITH_INFO indicates that some warning information is displayed.
SQL_ERROR indicates major errors, such as memory allocation and connection failures.
SQL_INVALID_HANDLE indicates that invalid handles are called. This value may also be returned by other APIs.
SQL_STILL_EXECUTING indicates that the statement is being executed.

Precautions

If SQLPrepare returns SQL_ERROR or SQL_SUCCESS_WITH_INFO, the application can call SQLGetDiagRec, with HandleType and Handle set to SQL_HANDLE_STMT and StatementHandle, respectively, to obtain the SQLSTATE value. The SQLSTATE value provides the detailed function calling information.