Question

我正在尝试从我的java代码中查询MS Access数据库，并且我没有运气，我读过的％通配符应该在其他帖子中工作。如果从代码中排除通配符并为searchText变量提供与记录描述完全匹配的值，LIKE运算符将起作用。下面是我尝试过的字符串查询，它们返回null或异常：

String tableName =“SSPWO”; String desc =“[Description]”;

  String query = String.format("SELECT * FROM %s WHERE " + desc + " LIKE '%" searchText +  "%' ORDER BY [WorkOrderNo] DESC", tableName);

||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||

String tableName =“SSPWO”; String desc =“[Description]”;

  String query = String.format("SELECT * FROM %s WHERE " + desc + " LIKE '*" searchText +  "*' ORDER BY [WorkOrderNo] DESC", tableName);

||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||

String tableName =“SSPWO”; String desc =“[Description]”;

  String query = String.format("SELECT * FROM %s WHERE " + desc + " LIKE \"%" searchText +  "%\" ORDER BY [WorkOrderNo] DESC", tableName);

||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||

String tableName =“SSPWO”; String desc =“[Description]”;

  String query = String.format("SELECT * FROM %s WHERE " + desc + " LIKE \'%" searchText +  "%\' ORDER BY [WorkOrderNo] DESC", tableName);

非常感谢任何帮助。

Answer 1

你无论如何都会遇到语法错误：

String query = String.format([..snip...] + " LIKE '%" searchText 
                                                     ^---missing +

Answer 2

百分号（%）绝对是在这种情况下使用的正确通配符。对于测试数据

ID  Description                        
--  -----------------------------------
 1  I like apple pie.                  
 2  This is a test.                    
 3  Apple makes iThings.               
 4  This is another test.              
 5  Name of a tropical fruit: pineapple

代码

String tableName = "SSPWO"; 
String desc = "[Description]";
String searchText = "apple";
PreparedStatement ps = con.prepareStatement(
        String.format("SELECT * FROM %s WHERE %s LIKE ?", tableName, desc)
        );
ps.setString(1, "%" + searchText + "%");
ResultSet rs = ps.executeQuery();
while (rs.next()) {
    System.out.println(String.format("%d: %s", rs.getInt(1),rs.getString(2)));
}

生成以下控制台输出

1: I like apple pie.
3: Apple makes iThings.
5: Name of a tropical fruit: pineapple

无法使用带有％或*的LIKE搜索MS Access数据库

2 个答案: