postgresql 如何从 Java 列表创建 SQL 数组？
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How create a SQL array from a Java List?
提问by Renato Dinhani
I'm trying to insert an array in a table, but I need to convert the list to the SQL Array type. I'm using the Connection#createArrayOf()method, but I'm getting an exception.
我正在尝试在表中插入一个数组，但我需要将列表转换为 SQL 数组类型。我正在使用该Connection#createArrayOf()方法，但出现异常。
I need to pass a type name, but I don't know what is this and I always get an exception. The array is from VARCHAR.
我需要传递一个类型名称，但我不知道这是什么，我总是得到一个例外。该数组来自 VARCHAR。
How I solve this to insert the array?
我如何解决这个问题以插入数组？
The code
代码
Object[] array = new Object[token.getCategories().size()];
array = token.getCategories().toArray();
pstmTokenInsert.setArray(1, conn.createArrayOf("VARCHAR", array));
The stacktrace
堆栈跟踪
org.postgresql.util.PSQLException: Could not find array type for data type VARCHAR
at org.postgresql.jdbc4.AbstractJdbc4Connection.createArrayOf(AbstractJdbc4Connection.java:73)
at org.postgresql.jdbc4.Jdbc4Connection.createArrayOf(Jdbc4Connection.java:21)
at org.apache.commons.dbcp.DelegatingConnection.createArrayOf(DelegatingConnection.java:560)
at br.ifsp.da.data.TokenDAO.insertTokens(TokenDAO.java:37)
at br.ifsp.da.data.ProcessedPageInserter.loopInsertion(ProcessedPageInserter.java:44)
at br.ifsp.da.data.ProcessedPageInserter.call(ProcessedPageInserter.java:27)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
回答by JB Nizet
Use "varchar" instead of "VARCHAR". See http://grepcode.com/file/repo1.maven.org/maven2/postgresql/postgresql/9.0-801.jdbc4/org/postgresql/jdbc2/TypeInfoCache.java#TypeInfoCache.0types
使用“varchar”而不是“VARCHAR”。见http://grepcode.com/file/repo1.maven.org/maven2/postgresql/postgresql/9.0-801.jdbc4/org/postgresql/jdbc2/TypeInfoCache.java#TypeInfoCache.0types
