1/12/2024 0 Comments Free TablePlus 5.4.3In a Pro*C/C++ program, initialize the 5-character host array str with 'X' characters and use for the retrieval of all the values in column strval:ĮXEC SQL SELECT strval INTO :str:str_ind WHERE. Which contains the following strings in the column strval: "" - string of length 0 The following example illustrates all possible combinations of the effects of the CHAR_MAP option settings on the value retrieved from a database into a character array.Īssume a database TABLE strdbase (. Strcpy(emp_name, "MILLER") /* No blank-padding required */ char emp_name /* Note: one greater than column size of 10 */ So, make sure that your data ends with a null. When DBMS=V7 or V8, input data in a character array must be null-terminated. To INSERT the character array when CHAR_MAP is set to VARCHAR2, you should execute the statements strncpy(emp_name, "MILLER ", 10) /* 4 trailing blanks */ This value does not meet the following search condition. You will find that the string "MILLER" was inserted as "MILLER\0\0\0\0" (with four null bytes appended to it). Strcpy(emp_name, "MILLER") /* WRONG! Note no blank-padding */ĮXEC SQL INSERT INTO emp (empno, ename, deptno) VALUES For example, if you execute the statements: char emp_name To make sure that the nulls are not inserted into the table, you must blank-pad the character array to its length. An un-initialized character array can contain null characters. When the CHAR_MAP option is set to VARCHAR2 trailing blanks are removed up to the first non-blank character before the value is sent to the database. When the DBMS=V7 or V8, character arrays must be null-terminated ('\0'). When the CHAR_MAP=VARCHAR2, host variable character arrays must be blank padded, and should not be null-terminated. On input, the DBMS option determines the format that a host variable character array must have in your program.
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