For example,Oracle Forms applications frequently use SQL statements to test the values offield entries and do simple computations. By using PL/SQL instead of SQL, theseapplications can avoid calls to the database. 2.2 PL/SQL Unitsand Compilation Parameters APL/SQL unit isone of these: PL/SQL ...
SQL游标包括:SQL%FOUND,SQL%NOTFOUND,SQL%ROWCOUNT,SQL%ISOPEN等四种属性 3.1 SQL%ISOPEN:执行时,会隐含的打开和关闭游标.因此该属性的值永远都是FALSE 3.2 SQL%FOUND:用于确定SQL语句执行是否成功.当SQL有作用行时,为TRUE,否则为FALSE v_deptno emp.deptno%type:=&no; update emp set sal=sal*1.1 where dept...
PL/SQL units areaffected by PL/SQL compilation parameters (a categoryof database initializationparameters). Different PL/SQL units—for example, a package specification andits body—can have different compilation parameter settings. --PL/SQL 单元受PL/SQL 编译参数的影响,不同的单元可以设置不同的编译...
ensuring the optimal choice of cursor for a specificbind value. For example, the optimizermight choose one plan for bind value 9 and a different plan for bind value 10.Cursor sharing is "adaptive" because the cursor adapts its behaviorso that the same plan is not always used for each...
Example:InaDELETEstatement,forexample, you could bindinanarrayintheWHEREclauseandhave the statement be runforeachelementinthearray:DECLAREstmt VARCHAR2(200); dept_no_array DBMS_SQL.NUMBER_TABLE; c NUMBER; dummy NUMBER;begindept_no_array(1) :=10; dept_no_array(2) :=20;/* Put some values...
The results show that 400 milliseconds of CPU time were used on parsing during the session, less than two thirds the amount used in the previous example. As expected, there is only a single statement in the shared pool. These simple examples clearly show how replacing literals with bind vari...
Bind variables can even be referenced by SQL queries : Variable « SQL PLUS Session Environment « Oracle PL/SQL TutorialOracle PL/SQL Tutorial SQL PLUS Session Environment VariableSQL> SQL> SET ECHO ON SQL> SQL> VARIABLE s_table_name varchar2(30) SQL> SQL> SQL> BEGIN 2 :s_...
You can bind only variable values. You can’t bind in the names of tables or columns, nor can you bind in parts of a SQL statement structure, such as the entire WHERE clause. In these cases, you must use concatenation. Example Here’s an example of binding with DBMS_SQL. This progr...
Oracle REST Data Services PL/SQLパッケージには、Oracle REST Data Servicesを使用してRESTfulサービスを開発するためのサブプログラム(プロシージャおよびファンクション)が含まれています。 関連トピック Oracle REST Data Services PL/SQL APIの使用 ...
The following example shows how to create a simple alias: 复制 SQL> ALIAS action1=select :one from dual;Note: Define an alias simply by using the alias keyword followed by a single identifier name followed by an '='. Anything after the '=' will be used as the alias contents. If it ...