如何使用Groovy将clob转换为字符串?
发布时间:2020-12-14 16:26:52  所属栏目:大数据  来源:网络整理 
            导读: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我试过这个: rowTest = sql.firstRow("select name from table where id=10")clobTest = (oracle.sql.CLOB)rowTest[0]byte_stream_t
                
                
                
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 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 解决方法
 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
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