带有LIKE的Oracle中的重音和不区分大小写的排序规则

Question

我发现此答案很有用：
Oracle中口音和不区分大小写的COLLATE等效，但是我的问题是关于使用版本9 Oracle
db进行LIKE搜索。

我试过这样的查询：

SELECT column_name
FROM table_name
WHERE NLSSORT(column_name, 'NLS_SORT = Latin_AI')
LIKE NLSSORT('%somethingInDB%', 'NLS_SORT = Latin_AI')

但不会返回任何结果。

我创建了一个小的Java文件进行测试：

import org.apache.commons.dbcp.BasicDataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class DbCollationTest
{
 public static void main(String[] args) throws SQLException
 {
  BasicDataSource dataSource = new BasicDataSource();
  dataSource.setDriverClassName("oracle.jdbc.driver.OracleDriver");
  dataSource.setUrl("url");
  dataSource.setUsername("usr");
  dataSource.setPassword("pass");

  Connection conn = null;
  PreparedStatement createStatement = null;
  PreparedStatement populateStatement = null;
  PreparedStatement queryStatement = null;
  PreparedStatement deleteStatement = null;
  ResultSet rs = null;

  try
  {
   conn = dataSource.getConnection();

   createStatement = conn.prepareStatement("CREATE TABLE CollationTestTable ( Name varchar(255) )");
   createStatement.execute();

   String[] names = { "pepe", "pépé", "PEPE", "MEME", "mémé", "meme" };
   int i = 1;

   for (String name : names)
   {
    populateStatement = conn.prepareStatement("INSERT INTO CollationTestTable VALUES (?)");
    populateStatement.setString(1, name);
    populateStatement.execute();
   }

   queryStatement = conn.prepareStatement("SELECT Name FROM CollationTestTable WHERE NLSSORT(NAME, 'NLS_SORT = Latin_AI') LIKE NLSSORT('%pe%', 'NLS_SORT = Latin_AI')");
   rs = queryStatement.executeQuery();

   while (rs.next())
   {
    System.out.println(rs.getString(1));
   }

   deleteStatement = conn.prepareStatement("DROP TABLE CollationTestTable");
   deleteStatement.execute();
  }
  finally
  {
   //DBTools.tidyUp(conn, null, rs);
   //DBTools.tidyUp(createStatement);
   //DBTools.tidyUp(populateStatement);
   //DBTools.tidyUp(queryStatement);
   //DBTools.tidyUp(deleteStatement);
  }
 }
}

我没有在谷歌搜索上取得任何成功，没有任何解决方案？

我想对名称的一部分执行搜索，并返回使用大小写和重音不敏感匹配的结果。

Answer 1

一种方法是修改会话参数NLS_SORT并NLS_COMP：

SQL> SELECT Name FROM CollationTestTable WHERE NAME LIKE '%pe%';

NAME
--------------------------------------------------------------------------------
pepe

SQL> alter session set nls_sort=Latin_AI;

Session altered

SQL> alter session set nls_comp=linguistic;

Session altered

SQL> SELECT Name FROM CollationTestTable WHERE NAME LIKE '%pe%';

NAME
--------------------------------------------------------------------------------
pepe
pépé
PEPE

如另一个SO所示，您不能将LIKE运算符用于NLSSORT（这是因为NLSSORT返回将用于排序的字节字符串，而LIKE仅适用于字符字符串）

更新： 虽然我将首选设置NLS参数，但也可以使用内置函数来获得相同的结果。几个例子：

SQL> SELECT Name
  2    FROM CollationTestTable
  3   WHERE upper(convert(NAME, 'US7ASCII'))
  4         LIKE upper(convert('%pe%', 'US7ASCII'));

NAME
--------------------------------------------------------------------------------
pepe
pépé
PEPE

SQL> SELECT Name
  2    FROM CollationTestTable
  3   WHERE upper(translate(NAME, 'àâéèêìîòôùûÿ', 'aaeeeiioouuy'))
  4         LIKE upper(translate('%pe%', 'àâéèêìîòôùûÿ', 'aaeeeiioouuy'));

NAME
-----------------------------------
pepe
pépé
PEPE