<variable>%TYPE | %TYPE | %ROWTYPE} [ [NOT NULL] {:= | DEFAULT} <expr> ] The <field_type> can be any PL/SQL data type except REF CURSOR. To declare a record variable: <variable_identifier> <type_name>; You can declare a variable based on a record reference using %ROWTYPE: <variable...
使用本地动态 SQL 比使用DBMS_SQL更简单,且大部分情况比DBMS_SQL更高效。但 Oracle 依然支持DBMS_SQL,所以动态 SQL 既可以通过本地动态 SQL 来执行,也可以通过DBMS_SQL包来执行。 通过本地动态 SQL 执行动态 SQL 语句的语法是: EXECUTE IMMEDIATE dynamic_string {INTO{define_variable1 [,define_variable2 .....
当一个SQL语句提交后,Oracle 在接收到这些SQL后,会先对这个SQL做一个hash 函数运算,得到一个Hash值,然后到共享池中寻找是否有和这个hash 值匹配的SQL存在。 如果找到了,Oracle将直接使用已经存在的SQL 的执行计划去执行当前的SQL,然后将结果返回给用户。 如果在共享池中没有找到相同Hash 值的SQL,oracle 会认为这...
示例说明了表的在线重新定义。 对于以下示例,请参阅_[Oracle Database PL/SQL Packages and Types Reference](https://docs.oracle.com/en/database/oracle/oracle-database/19/arpls/DBMS_REDEFINITION.html#GUID-045732D9-6831-4411-BE1C-6FCB2A1F99B9)以了解所有DBMS_REDEFINITION子程序的描述。 例子 通过...
Maximum size of 32KB in PLSQL. Maximum size of 4000 bytes. Maximum size of 32KB in PLSQL. Maximum size of 4000 bytes. Maximum size of 32KB in PLSQL. Where size is the number of characters to store. Variable-length string. long Maximum size of 2GB. Maximum size of 2GB. Maximum size...
TheDBMS_SQLpackage has been enhanced to support more bind variable types. TheDESC_REC4RECORD Type andDESC_TAB4TABLE Type are introduced to support longer identifiers. See BIND_VARIABLE Procedures VARIABLE_VALUE Procedures BIND_VARIABLE_PKG Procedure(new) ...
to the variables with a SELECT .. INTO type of query, let’s do an example extracting a specific customer First and Last name and return it using the DBMS_OUTPUT clause as I did in this tip:INSERT INTO for SQL Server, Oracle and PostgreSQLreturning the value assigned to a variable. ...
<variable name="$TargetPassword$" value="<password>"/> <variable name="$TrustedConnection$" value="<true/false>"/> </variable-group> <variable-group name="SqlServerObjectParams"> <variable name="$ObjectName1$" value=""/> <variable name="$ObjectName2$" value=""/> </variable-group...
With all four methods, you must store the dynamic SQL statement in a character string, which must be a host variable or quoted literal. When you store the SQL statement in the string, omit the keywords EXEC SQL and the ';' statement terminator.With Methods 2 and 3, the number of ...
DBMS_SQL可以在应用的运行时间构建查询和其它的命令。DBMS_SQL中可以使用的存储过程及函数如下表所示: 存储过程/函数描述 BIND_VARIABLE(c, name, value [, out_value_size ]) Bind a value to a variable BIND_VARIABLE_CHAR(c, name, value [, out_value_size ]) Bind a CHAR value to a variable BIN...