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For example, if you OPEN the cursor in one subprogram, then FETCH from it in another subprogram, you must declare db_name globally. If db_name is a host variable, its declaration must be within the scope of all SQL statements that refer to the DECLAREd cursor. If you want to associate a cursor with an explicitly identified database, use the AT clause in the DECLARE CURSOR statement, as follows: EXEC SQL AT :db_name DECLARE emp_cursor CURSOR FOR. AT DB_NAME statement.Ĭursor control statements such as OPEN, FETCH, and CLOSE are exceptions-they never use an AT clause. Only if DB_NAME is an undeclared identifier must you execute a DECLARE DB_NAME DATABASE statement before executing a CONNECT. If db_name is a host variable, the DECLARE DATABASE statement is not needed. * connect to the nondefault database using db_name */ Later, SQL statements using the AT clause (with DB_NAME) are executed at the database specified by db_string.Īlternatively, you can use a character host variable in the AT clause, as the following example shows: /* declare needed host variables */ The USING clause specifies the network, machine, and database associated with DB_NAME. The undeclared identifier DB_NAME names a nondefault connection it is an identifier used by Oracle, not a host or program variable. The host variable db_string contains the Oracle Net syntax for connecting to a nondefault database at a remote node.
#SQLI DUMPER 9.8.3 DESCARGAR PASSWORD#
The host variables username and password identify a valid user. The identifiers in this example serve the following purposes: * give the database connection a unique name */ĮXEC SQL CONNECT :username IDENTIFIED BY :password In the following example, you connect to a single nondefault database at a remote node: /* declare needed host variables */ Hard coding usernames and passwords is not recommended practise. For example, both of the following statements are invalid:ĮXEC SQL CONNECT SCOTT IDENTIFIED BY TIGER ĮXEC SQL CONNECT 'SCOTT' IDENTIFIED BY 'TIGER' However, you cannot hard-code a username and password into the CONNECT statement. Your program can prompt for the values, or you can hard-code them as follows: char *username = "SCOTT" ĮXEC SQL CONNECT :username IDENTIFIED BY :password Make sure to set the username and password variables before the CONNECT is executed, or it will fail. (If you supply a username containing both username and password, only one host variable is needed.) To supply the Oracle username and password separately, you define two host variables as character strings or VARCHARs. That is, other SQL statements can physically but not logically precede the CONNECT statement in the precompilation unit. The CONNECT statement must be the first SQL statement executed by the program. These are simplified subsets of the CONNECT statement. Where the host variable usr_pwd contains your username and password separated by a slash character (/).
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Or, you can use the statement EXEC SQL CONNECT :usr_pwd Where username and password are char or VARCHAR host variables. To log on, simply use the CONNECT statement EXEC SQL CONNECT :username IDENTIFIED BY :password Your Pro*C/C++ program must connect to the database before querying or manipulating data. The complete syntax of the CONNECT statement will be discussed in the next few sections.