Question

我想从数据类型为clob的表中选择数据。所以resut就像oracle.sql.CLOB@12fe54d 我想将数据显示为表中显示的字符串。

在groovy中我试过这个：

rowTest = sql.firstRow("select name from table where id=10")
clobTest = (oracle.sql.CLOB)rowTest[0]

byte_stream_test = clobTest.getBinaryStream()
if( byte_stream_test == null ) {  println "Test: Received null stream!"  }

byte[] byte_array_test = new byte[10]
int bytes_read_test = byte_stream_test.read(byte_array_test)

print "Read $bytes_read_test bytes from the clob!"

sql.connection.close()

我有以下错误：

---- A working test of writing and then reading a blob into an Oracle DB ---
Exception in thread "main" groovy.lang.MissingMethodException: No signature of method: oracle.sql.CLOB.getBinaryStream() is applicable for argument types: () values: []
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:56)
    at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
    at Test2.run(Test2.groovy:10)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1016)
    at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:901)
    at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:884)
    at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:406)
    at org.codehaus.groovy.runtime.InvokerHelper$runScript.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
    at Test2.main(Test2.groovy)

你能帮我解决这个问题吗，谢谢你

Answer 1

请尝试以下代码：

  rowTest = sql.firstRow("select name from table where id=10")
  clobTest = (oracle.sql.CLOB)rowTest[0]
  bodyText = clobTest?.asciiStream.text
  println bodyText

Answer 2

使用characterStream而不是asciiStream来支持Unicode字符：

String unicode = "äö"
Clob clob = new ClobImpl(unicode)
String strClob = clob?.characterStream?.text
assertEquals(strClob, unicode)

如何使用Groovy将clob转换为字符串？

2 个答案: