[英]Cassandra/Datastax: How to get values of column having list datatype in java
[英]Cassandra : How to get the String value of column data irrespective of datatype
我正在尝试从com.datastax.driver.core.ResultSet
获取结果并进行打印:
ResultSet results = getSession().execute("Select * from test.table"); //getsession returns a session
int numcols = results.getColumnDefinitions().size();
for ( Row row : results ) {
for (int colIndex = 0; colIndex < numcols; colIndex++) {
System.out.println("data: " + row.getString(colIndex));
}
}
如果数据类型不是String,则row.getString(colIndex)
引发异常。 无论字符串是什么数据类型,我如何都能得到它?
此代码将打印每列的类型和值
ResultSet results = getSession().execute("Select * from test.table");
int numcols = results.getColumnDefinitions().size();
for ( Row row : results ) {
for (int colIndex = 0; colIndex < numcols; colIndex++) {
System.out.println("Type : "+row.getColumnDefinitions().getType(colIndex));
Class c = row.getColumnDefinitions().getType(colIndex).asJavaClass();
if(c == Integer.class) {
System.out.println("Data :" + row.getInt(colIndex));
}
//similar for other type
}
}
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