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# lr_param_increment

Increments the value of a numerical parameter.

    int lr_param_increment( char *destination_param, char *source_param );

Alphabetical Listing - C Language Utility Functions

## Arguments

Name | Comments
--- | ---
destination_param | The name of the parameter to store the incremented parameter
source_param | The name of the parameter whose value is incremented

The lr_param_increment function retrieves the value of source_param, increments its value by one, and stores the incremented value as a null terminated string in destination_param.

This function is useful only in protocols that have a numerical parameter type. For protocols that have only string parameters, increment with C functions. For example:

         i = atoi(lr_eval_string("{modification_num}"));
         sprintf(buf, "%d", i+1);
         lr_save_string(buf, "next_modnum");

For protocols that have a numerical parameter, lr_param_increment can be used:

         lr_param_increment("next_modnum", "{modification_num}");

source_param must be initialized with an integer value prior to calling lr_param_increment. source_param's value should include only single-byte digit characters with an optional sign or leading zeros.

When destination_param exists, its value is overwritten. When it doesn't exist, the parameter is created dynamically.

The value of source_param is restricted to the maximum value of a long integer minus 1.

## Return Values

This function returns the following values:

Enum | Value | Result
--- | --- | ---
LR_PARAM_INC_OK | 0 | Success
LR_PARAM_INC_ERR_SAVE_FAILED | -1 | The save operation to the destination parameter failed.
LR_PARAM_INC_ERR_MBCS_IN_SRC | -2 | The source parameter includes multibyte characters, which indicates that it is not a pure numeric parameter.
LR_PARAM_INC_ERR_SRC_NOT_NUM | -3 | The source parameter includes singlebyte characters that are not digits, or the source parameter does not exist.
LR_PARAM_INC_ERR_EVAL_FAILED | -4 | The evaluation operation of the source parameter failed.

## Parameterization

Standard parameterization is not available for this function.

## Example

The following code snippet illustrates lr_param_increment being used to increment the value of a parameter modification_num, and storing the incremented value as a new parameter, next_modnum.

This new parameter is assigned to the ":1" placeholder within an Oracle statement using lrd_assign(). The statement is then executed using the lrd_ora8_exec function.

    /* Get value of modification_num from Oracle database */
    lrd_ora8_save_col(OraStm142, 9, 1, 0, "modification_num");
    /* modification_num = "194128" */

    lrd_ora8_fetch(OraStm142, -1, 408, &uliFetchedRows, PrintRow52, 2, 0, 1);

    /* Increment modification_num and store it as "next_modnum" */
    lr_param_increment("next_modnum", "{modification_num}");
    /* next_modnum was "194129" during recording. */

    lrd_ora8_stmt(OraStm143, "\nUPDATE S_SSA_ID SET\n "
           "NEXT_SUFFIX = 'ABCDE',\n MODIFICATION_NUM = :1\n "
           " WHERE\n MODIFICATION_NUM = :2\n", 1, 0, 0);

    /* Assign the new incremented value of next_modnumto the statement */
    lrd_assign(&P1D1062, "{next_modnum}", 0, 0, 0);
    lrd_ora8_bind_placeholder(OraStm143, &OraBnd496, "1", &P1D1062,
    LRD_BIND_BY_POS, 0, 0);

    lrd_assign(&P2D1063, "{modification_num}", 0, 0, 0);
    lrd_ora8_bind_placeholder(OraStm143, &OraBnd497, "2", &P2D1063,
    LRD_BIND_BY_POS, 0, 0);
    lrd_ora8_exec(OraSvc6, OraStm143, 1, 0, &uliRowsProcessed, 0, 0, 0, 0, 0);

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