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In some cases, security judgment is required in the where condition of an SQL statement. For example, if the input parameter is null during a query based on a condition, the query result may be null, if the parameter is null, all information is found. Use the Oracle sequence and MySQL functions to generate IDS. In this case, we can use dynamic SQL.MySQL syntax an
Method 1: As you all know, to connect to Oracle using PL/SQL, you need to install the Oracle client software. Have you ever wondered whether to directly connect to Oracle without installing the Oracle client? In fact, I always wanted to do this, because this client is so ann
a semicolon at its tail.4. In the Oracle manual, these features are not covered in detail. The following example shows all possible aspects of using the execute immediate. Hope to bring you convenience.5. For the forms developer, the forms 6i cannot use this feature in the PL/SQL 8.0.6.3. Version. EXECUTE Immediate Usage Example 1. Running DDL statements in PL/SQLBEGINEXECUTE IMMEDIATE ' Set role all ';END
Tags: convert BSP technology SQ into stitching varchar date httpI. Original data: select inman,indate from [ fp_db ] . [ dbo ] . [ ppezhpbb where indate > " 2016-5-1 " and indate 2016-6-1 " ORDER by indate Two. Post-conversion (dynamic splicing of SQL):--data Pre-existing temp tableSELECTInman,indate into#tab from [fp_db].[dbo].[Ppezhpbb]WHEREIndate> '2016-5-1' andIndate '2016-6-1'-
After learning how to use ibatis over the past few days, I suddenly used fuzzy queries and dynamic multi-condition queries. I tried it for a long time based on my own ideas and did not solve this problem. The first problem is fuzzy query. At the beginning, I used the following conditions: Select * from user where name like '% # value # % '. but why not? It seems that an error has been reported. later, I found a solution on the Internet, which is t
: Executed SQL statement. V$lock: What kind of lock does the session occupy, and what kind of lock is applied, and whether the session is blocking the other session. V$locked_object which objects are locked. V$session_wait View Session Wait information: SELECT * from v$session_wait where wait_class! = ' Idle ' to see the session that is still waiting, such as a blocked session. V$session_wait_history:session wait for historical information, save only
In the dynamic performance view of Oracle, V $ SGA has no other views. The structure is as follows: SQL> DESC v $ SGAIs the name empty? Type-------------------------------------------------------------------------------------------------Name varchar2 (20)Value number There are only two fields, type name and Value View data: S
Executing dynamic SQL statements in stored proceduresMSSQL provides us with two commands for dynamically executing SQL statements, namely exec and sp_executesql, and generally, sp_executesql has the advantage of providing an input-output interface, and exec does not. One of the biggest benefits is the ability to reuse execution plans with sp_executesql, which pro
MSSQL provides us with two commands for dynamically executing SQL statements, namely exec and sp_executesql, and generally, sp_executesql has the advantage of providing an input-output interface, and exec does not. One of the biggest benefits is the ability to reuse execution plans with sp_executesql, which provides execution performance and can write more secure code. EXEC will be more flexible in some cases. Unless you have compelling reasons to use
We all know how to use MyBatis to execute arbitrary SQL, and the method is simple, for example, in a xxmapper.xml: You can call the following: Sqlsession.selectlist ("ExecuteSQL", "select * from Sysuser where enabled = 1"); Alternatively, you can define the following methods in the Xxmapper.java interface: list Then use the interface to invoke the method: Xxmapper.executesql ("select * from Sysuser where
1. Dynamic SQL Dynamic SQL is a core of mybatis, what is dynamic SQL? Dynamic SQL is a flexible operation of
The local_listener parameter has two writing formats and provides different functions. On the listener file, ports 1521 and 1526 have dynamic listening ports. [oracle@dbsv admin]$ cat listener.ora LISTENER= (DESCRIPTION= (ADDRESS_LIST= (ADDRESS=(PROTOCOL=tcp)(HOST=dbsv)(PORT=1521)) (ADDRESS=(PROTOCOL=ipc)(KEY=extproc))))SID_LIST_LISTENER= (SID_LIST= (SID_DESC= (GLOBAL_DBNAME=PROD)
1. Check the alarm log/u01/app/oracle/diag/rdbms/orcl/orcl/trace/alert_orcl.logReal-time logs: Tail-f/u01/app/oracle/diag/rdbms/orcl/orcl/trace/alert_orcl.logTrace File ADR2. Dynamic performance view (v$) saved in memoryInformation used to access the changing state of the instance memory structure (control file + instance)Session dataWait eventsMemory Allocations
Label:MSSQL provides us with two commands for dynamically executing SQL statements, namely exec and sp_executesql, and generally, sp_executesql has the advantage of providing an input-output interface, and exec does not. One of the biggest benefits is the ability to reuse execution plans with sp_executesql, which provides execution performance and can write more secure code. EXEC will be more flexible in some cases. Unless you have compelling reasons
Learning Dynamic Performance TableThird article -(1)-v$sq 2007.5.25A specific SQL statement is stored in the v$sql.A statement can map multiple cursor, because the cursor that the object refers to can have different users (such as Example 1). If there is more than one cursor (child cursor) present, the V$sqlarea provides the collection information for all cursors.Example 1 :Here are the following child curs
Sql> Select name,value,isses_modifiable (Parameters modified at session level), issys_modifiable (parameters modified at the system level)2 from V$parameter3 where name= ' max_dump_file_size ';Sql>alter system Reset _allow_resetlogs_corruption scope=spfile sid= ' * ';If isses_modifiable=true, it indicates that this parameter can be modified at the session level and takes effect immediately.
The Local_listener parameter has two writing formats that provide different functionality.On the listening file, there are dynamic listening ports on both 1521 and 1526 ports.[email protected] admin]$ cat Listener.ora listener= (description= (address_list= (address= (protocol= TCP) (HOST=DBSV) (port=1521)) (address= (PROTOCOL=IPC) (Key=extproc))) sid_list_listener= (sid_list= ( sid_desc= (Global_dbname=prod) ( oracle_home=/u01/
Oracle cursor (iii) REF Dynamic Cursor link: Oracle cursor (I) Explicit cursor http://www.bkjia.com/database/201208/150342.html#oraclecursor (ii) Implicit cursor http://www.bkjia.com/database/201208/150344.html REF dynamic cursor is used to process query result sets for multiple rowsIn the same PLSQL block, the REF
Oracle remote connection (PLSQL, SQL developement + Oracle database + client + remote connection settings, plsqldevelopement Server Configuration: oracle11g R2 x64 1. Set the listener A. Launch bar-> Start-> Program-> Oracle-OraDb11g_home1-> Configure and port tools-> Net Manager B.
Oracle cold, stay at home and read the "Mastering Oracle SQL" 2nd, found that Oracle's function is still very strong, there are 200 optical functions, hsql is difficult to match. The next stubborn, it seems either to risk using Hibernate3.0 SQL mapping function, or to run the JDBC assembly VO. 1. Report Totals dedicate
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