PostgreSQL触发器是一种在数据库中定义的特殊函数,它可以在特定的数据库操作(如插入、更新、删除)发生时自动执行。触发器可以用于实现数据的完整性约束、数据验证、日志记录、数据同步等功能。 execute procedure是触发器中的一种动作,它允许在触发器被激活时执行一个存储过程(procedure)。存储过程是一组预定义的SQL...
PostgreSQL中的EXECUTE新语法 在PostgreSQL中,EXECUTE通常与PREPARE一起使用来执行预编译的SQL语句。这在需要多次执行相同或类似查询时特别有用,因为它可以提高性能并减少解析时间。 基本用法: 准备语句: PREPARE stmt_name (parameter_type [, ...]) AS query; 执行语句: EXECUTE stmt_name USING value [, ......
create [or replace] procedure 存储过程名称(参数1,参数2,...) is begin end; 1. 2. 3. 4. 5. 6. demo 使用执行过程输出一句话, --创建执行过程 create or replace procedure procedure_name(str varchar2) is begin dbms_output.put_line(str); end; --使用执行过程 方式一 : call procedure_name...
然后,在存储过程your_procedure中,我们定义了一个游标cur,并将其与get_data_generator函数相关联。在存储过程中,我们使用FETCH语句从游标中获取结果集的每一行数据,并在每次迭代中使用yield语句返回当前行的数据。 请注意,上述示例是使用PostgreSQL的PL/pgSQL语言编写的。如果你使用的是其他数据库,语法可能会有所不...
Create a PL/SQL procedure namedraise_sal. Define a SQL statement with a dynamic value for the column name included in theWHEREstatement. Use theEXECUTE IMMEDIATEcommand supplying the two bind variables to be used as part of theSELECTstatement:amountandcol_val. ...
execute a stored procedure in a loop Execute attribute before running method Execute Batch File From C# Console Execute batch file on remote PC Execute BCP Out from C# executereader requires an open and available connection. the connection's current state is closed. ExecuteReader returns null with ...
Execute SQL script on PostgreSQL database Since R2020b collapse all in pageSyntax results = executeSQLScript(conn,scriptfile) results = executeSQLScript(conn,scriptfile,Name,Value)Description results = executeSQLScript(conn,scriptfile) uses the database connection conn to return a structure array ...
The SQL statement can be a stored procedure that does not return any result sets. For stored procedures that return one or more result sets, use the fetch function. For information about the SQL query language, see the PostgreSQL Documentation. Example: "DROP TABLE patients" Data Types: char...
As mentioned earlier, stored procedures are pre-saved commands in SQL. In this section, we will learn to create a stored procedure and then use the EXECUTE or EXEC command to execute it. Consider the following SQL script. Here we have first created a dummy table called “students” with fi...
PL/SQL procedure successfully completed.SQL> column name format A35 SQL> set linesize 120 SQL> SQ...