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Host variables
Host variables are data items declared in a host application program and used in bothhost language statements and embedded SQL statements. They provid...
分类:其他好文   时间:2015-06-30 20:19:38    阅读次数:128
MySQL的事务陷阱和艺术
作者在之前的文章 “MySQL事务及为何不能在PHP模仿事务” 里面, 详细说明了事务的优点,并介绍了一些简单的SQL命令,使得应用程序更加健壮。但在web程序员的生命旅程中并没有多少事情是看起来那样简单的。。。。。不能回滚的语句(Statements you can’t ROLLBACK)很遗憾滴通知你, 并不是所有的数据库操作都支持回滚( ROLLBACK ) 。如果你更改数据库/表结构(sch...
分类:数据库   时间:2015-06-29 20:31:14    阅读次数:152
JavaScript 语句分号的必要性
Statements in ECMAScript are terminated by a semicolon, though omitting the semicolon makes the parser determine where the end of a statement occurs, as in the following examples: var sum = a + b ...
分类:编程语言   时间:2015-06-28 15:42:27    阅读次数:107
PL/SQL Transaction Control
PL/SQL 基础 ( 下 )1. PL/SQL中的 SQL语句- END语句与COMMIT等内容,没有任何关系。- PL/SQL does not directly support data definition language( DDL ) statements, such as CREATE...
分类:数据库   时间:2015-06-28 11:06:53    阅读次数:121
mybatis--常见的错误
1.没有在configuration.xml配置对应的sql配置文件错误:Error updating database. Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain...
分类:其他好文   时间:2015-06-27 11:17:29    阅读次数:128
Exception handling statements
Exception handling statements
分类:其他好文   时间:2015-06-26 00:26:06    阅读次数:153
How To Use TKPROF To Trace And Analyze Sql Explan
The SQL Trace facility and TKPROF let you accurately assess the efficiency of the SQL statements an application runs. For best results, use these tools withEXPLAIN PLAN rather than using EXPLAIN PLAN ...
分类:数据库   时间:2015-06-17 11:38:24    阅读次数:184
java.sql.SQLException: Can not issue data manipulation statements with executeQuery().
1、错误描述 java.sql.SQLException: Can not issue data manipulation statements with executeQuery(). at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996) at com.mysql.jdbc.SQLError.createSQLEx...
分类:数据库   时间:2015-06-11 13:09:17    阅读次数:172
Python之global
1 Global The global statement and its nonlocal cousin are the only things that are remotely likedeclaration statements in Python. They are not type .....
分类:编程语言   时间:2015-06-10 20:47:24    阅读次数:130
MySQL(Flow Control Statements)
Flow Control Statements
分类:数据库   时间:2015-06-09 09:39:05    阅读次数:156
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