Oracle/PLSQL: Declare a Cursor A cursor is a SELECT statement that is defined within the declaration section of your PLSQL code. We'll take a look at three different syntaxes for cursors. Cursor without paramet
所有的SQL数据操作语句都可以用于执行部分,PL/SQL块不能在屏幕上显示SELECT语句的输出。SELECT语句必须包括一个INTO子串或者是游标的一部分,执行部分使用的变量和常量必须首先在声明部分声明,执行部分必须至少包括一条可执行语句,NULL是一条合法的可执行语句,事物控制语句COMMIT和ROLLBACK可以在执行部分使用,数据定义语言DDL...
PL/SQL Basic --PL/SQL块结构DECLARE/**定义部分-定义常量,变量,复杂数据类型,游标。 可选 没有;*/BEGIN/**执行部分-sql语句 必须 没有;*/EXCEPTION/**例外处理部分-处理运行错误 可选 没有;*/END;/*块结束标志 必须;*/setserveroutputonBEGINDBMS_OUTPUT.PUT_LINE('Hello');END;DECLAREv_enameVARCHAR(...
In eitherenvironment, the PL/SQL engine accepts as input any valid PL/SQL unit. Theengine runs procedural statements, but sends SQL statements to the SQL enginein the database, as shown in Figure1-1. --PL/SQL 引擎接收任何有效的PL/SQL 单元,然后执行里面的过程语句,但是对于SQL...
Syntax EXECUTE IMMEDIATEsql-expression INTO,variableBULK COLLECT INTO,array-variableUSING,INexpressionIN OUTvariableOUTvariable Description sql-expression An expression returning the statement string to be executed. The expression must return a character-string type that is less than the maximum statement ...
A SQLJ program is a Java program containing embedded static SQL statements that comply with the ANSI-standard SQLJ Language Reference syntax.Although some Oracle tools and applications simplify or mask SQL use, all database operations are performed using SQL. Any other data access method circumvents...
A new“Paste from Host Language”function makes it easy to copy SQL statements from a host language like C++, Java, Basic or Pascal. The host language elements are removed and string syntax elements are converted: A new“Web Search”function allows you to quickly search on the web for text...
The basic syntax for a declaration is: name datatype[NOT NULL] [ := | DEFAULTdefault_assignment]; wherenameis the name of the variable or constant to be declared, anddatatypeis the datatype or subtype that determines the type of data that can be assigned to the variable. You can includ...
You code the pragmaEXCEPTION_INITin the declarative part of a PL/SQL block, subprogram, or package using the syntax PRAGMA EXCEPTION_INIT(exception_name, -Oracle_error_number); whereexception_nameis the name of a previously declared exception and the number is a negative value corresponding to ...
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