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i want to select data from a table with datatype clob. so the resut is like oracle.sql.CLOB@12fe54d I want to display the data as string as they appear in the table.
in groovy i tried this:
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 $bytes_read_test bytes from the clob!"
sql.connection.close()
I have the following error:
---- A working test of writing and then reading a blob into an Oracle DB ---
Exception in thread "main" groovy.lang.MissingMethodException: No signature of method: oracle.sql.CLOB.getBinaryStream() is applicable for argument types: () values: []
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:56)
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
at Test2.run(Test2.groovy:10)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1016)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:901)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:884)
at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:406)
at org.codehaus.groovy.runtime.InvokerHelper$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)
Can you help me to resolve this problem, thank you
649
To convert CLOB data type to string Reader r = clob. getCharacterStream(); Read each character one by one from the retrieved Stream of characters and append them to the StringBuilder or StringBuffer.
You can read CLOB value (character stream data) from a table using getCharacterStream() or getClob() methods of the ResultSet interface. These methods accept an integer value representing the index of the required column (or, a String value representing its name) and, reads CLOB data from it.
To read from a CLOB, use the getAsciiStream() or getCharacterStream() method of an oracle. sql. CLOB object to retrieve the entire CLOB as an input stream. The getAsciiStream() method returns an ASCII input stream in a java.
A CLOB (character large object) value can be up to 2,147,483,647 characters long. A CLOB is used to store unicode character-based data, such as large documents in any character set.
Try the following code:
rowTest = sql.firstRow("select name from table where id=10")
clobTest = (oracle.sql.CLOB)rowTest[0]
bodyText = clobTest?.asciiStream.text
println bodyText
Use characterStream instead of asciiStream to support Unicode characters:
String unicode = "äö"
Clob clob = new ClobImpl(unicode)
String strClob = clob?.characterStream?.text
assertEquals(strClob, unicode)
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