} private void Search_Click(object sender, EventArgs e) { string key = this.textBox1.Text; IndexSearcher search = new IndexSearcher(@"c:/index/"); //把刚才建立的索引取出来 Term t = new Term("ProductDesc", "*" + key + "*"); WildcardQuery query = new WildcardQuery(t); Hits h...
WildcardQuery query = new WildcardQuery(t); 它通过WildcardQuery(通配符查询, 包括?和*) 实现了类似like的模糊查询, 这样, 就解决了上面like查得出但慢, sqlserver full-text search虽快但查不出来的问题. 但据说lucene建(更新)索引时不能查, 查时则不能建(更新)索引, 还没细看,如果是这样, 还是有些...
//此时 SearchQuery中的sql为 //select * from zoo where breeder="饲养员1号" or animal in("rabbit","lion") ORDER BY id DESC LIMIT 0,2 SearchQuery query = nativeSearchQueryBuilder.build(); System.out.println("查询的语句:" + query.getQuery().toString()); //7.开始查询 Page<Zoo> list...
Performing a wildcard searchSQL Search also supports the use of one or more wildcards in your search term via the Use wildcards option. You can perform some useful searches in this way, such as to find:Objects that contain a specified term – such as tables within a certain schema that ...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric Matches any single character that is not within the range or set specified between the square brackets [^]. These wildcard characters can be used in string comparisons that involve pattern match...
Syntax for SQL Server, Azure SQL Database, and Azure SQL Managed Instance.syntaxsql Copy <search_condition> ::= MATCH (<graph_search_pattern>) | <search_condition_without_match> | <search_condition> AND <search_condition> <search_condition_without_match> ::= { [ NOT ] <predicate> | ...
Syntax for SQL Server, Azure SQL Database, and Azure SQL Managed Instance.syntaxsql Copy <search_condition> ::= MATCH (<graph_search_pattern>) | <search_condition_without_match> | <search_condition> AND <search_condition> <search_condition_without_match> ::= { [ NOT ] <predicate> | ...
在SQL Server的SQL优化过程中,如果遇到WHERE条件中包含LIKE '%search_string%'是一件非常头痛的事情。这种情况下,一般要修改业务逻辑或改写SQL才能解决SQL执行计划走索引扫描或全表扫描的问题。最近在优化SQL语句的时候,遇到了一个很有意思的问题。某些使用LIKE '%' + @search_string + '%'(或者 LIKE @search_...
A wildcard character is used to substitute one or more characters in a string. Wildcard characters are used with theLIKEoperator. TheLIKEoperator is used in aWHEREclause to search for a specified pattern in a column. ExampleGet your own SQL Server ...
简介: 原文:SQL Server中LIKE %search_string% 走索引查找(Index Seek)浅析 在SQL Server的SQL优化过程中,如果遇到WHERE条件中包含LIKE '%search_string%'是一件非常头痛的事情。原文: SQL Server中LIKE %search_string% 走索引查找(Index Seek)浅析 在SQL Server的SQL优化过程中,如果遇到WHERE条件中包含LIKE '...