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SQL parser library for Java [closed]
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JSqlParser
Presto's parser is written using ANTLR4 and has its own immutable AST classes that are built from the parser. The AST has a visitor and pretty printer.
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Optimistic vs. Pessimistic locking
... diagram above, both Alice and Bob will acquire a read lock on the account table row that both users have read. The database acquires these locks on SQL Server when using Repeatable Read or Serializable.
Because both Alice and Bob have read the account with the PK value of 1, neither of them can ch...
JSON encode MySQL results
...ks this helped me a lot. My code:
$sqldata = mysql_query("SELECT * FROM `$table`");
$rows = array();
while($r = mysql_fetch_assoc($sqldata)) {
$rows[] = $r;
}
echo json_encode($rows);
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Filtering DataGridView without changing datasource
... datagridview. It should work for 3 types of datagridview datasources: DataTable, DataBinding and DataSet.
My problem is with filtering DataTable from DataSet object, which is displayed on DataGridView.
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varbinary to string on SQL Server
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THIS ANSWER IS NOT CORRECT. I tested it on table with user SIDs - amount of Distinct casted values is less then amount of Distinct binary SIDs. You should use CONVERT(VARCHAR(...), binaryValue, 2) to get unique value - answer from Gunjan Juyal is the right one - it sh...
Checking for an empty field with MySQL
...e range access if you have lots of empty email record (both types) in your table.
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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...程序访问的都是虚拟内存地址，然后操作系统会通过Page Table机制把它翻译成物理内存地址，详细说明可以参考Understanding Memory和Understanding Virtual Memory，至于程序是如何使用虚拟内存的，可以参考Playing with Virtual Memory，这里就不...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...程序访问的都是虚拟内存地址，然后操作系统会通过Page Table机制把它翻译成物理内存地址，详细说明可以参考Understanding Memory和Understanding Virtual Memory，至于程序是如何使用虚拟内存的，可以参考Playing with Virtual Memory，这里就不...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...程序访问的都是虚拟内存地址，然后操作系统会通过Page Table机制把它翻译成物理内存地址，详细说明可以参考Understanding Memory和Understanding Virtual Memory，至于程序是如何使用虚拟内存的，可以参考Playing with Virtual Memory，这里就不...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...程序访问的都是虚拟内存地址，然后操作系统会通过Page Table机制把它翻译成物理内存地址，详细说明可以参考Understanding Memory和Understanding Virtual Memory，至于程序是如何使用虚拟内存的，可以参考Playing with Virtual Memory，这里就不...