Question

我试过了这个查询

String sql1="select * from custinf";
        try {
            stmt=conn.createStatement();
            stmt.execute(sql1);
            stmt.close();
        } catch (SQLException ex) {
            Logger.getLogger(Database.class.getName()).log(Level.SEVERE, null, ex);
        }

它抛出

java.sql.SQLSyntaxErrorException: Table/View 'CUSTINF' does not exist.
    at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(Unknown Source)
    at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
    at org.apache.derby.client.am.ClientStatement.execute(Unknown Source)
    at com.atuts.cms.database.Database.addCustomer(Database.java:57)
    at com.atuts.cms.database.Database.main(Database.java:31)
Caused by: ERROR 42X05: Table/View 'CUSTINF' does not exist.
    at org.apache.derby.client.am.ClientStatement.completeSqlca(Unknown Source)
    at org.apache.derby.client.net.NetStatementReply.parsePrepareError(Unknown Source)
    at org.apache.derby.client.net.NetStatementReply.parsePRPSQLSTTreply(Unknown Source)
    at org.apache.derby.client.net.NetStatementReply.readPrepareDescribeOutput(Unknown Source)
    at org.apache.derby.client.net.StatementReply.readPrepareDescribeOutput(Unknown Source)
    at org.apache.derby.client.net.NetStatement.readPrepareDescribeOutput_(Unknown Source)
    at org.apache.derby.client.am.ClientStatement.readPrepareDescribeOutput(Unknown Source)
    at org.apache.derby.client.am.ClientStatement.flowExecute(Unknown Source)
    at org.apache.derby.client.am.ClientStatement.executeX(Unknown Source)
    ... 3 more

当我将查询更改为String sql1="select * from \"custinf\""时;它正在发挥作用。使用mysql db时我没有遇到过这个问题。任何人都可以解释一下吗？

Answer 1

引用an answer to a different question：

select * from table3
将由数据库自动处理，就像它是
一样
select * from TABLE3
，而
select * from "table3"
将成功匹配您创建的表create table "table3"

因此，如果您的表格已设为custinf，则必须使用"custinf"。使用不带引号的custinf 会将您的查询转换为使用可能不存在的表名CUSTINF。

Answer 2

Derby表名称区分大小写。它可能是＆＃34; Custinf＆＃34;或＆＃34; custinf＆＃34;。

您可以删除custinf表并使用适当的大小写重新创建。

Derby嵌入式数据库中的查询

2 个答案: