[英]Groovy Better Approach to create comma separated string from Database Select Query
I am trying to connect to oracle database table and pull the data and form the result in the form of comma separated values. 我正在尝试连接到oracle数据库表并提取数据并以逗号分隔值的形式形成结果。 I have written a sample code which works fine but wanted to have a better approach if the query is associated with more tables (joins), then the time is taken to get the output is more.
我编写了一个示例代码,该代码运行良好,但是如果查询与更多表(联接)相关联,则希望有一种更好的方法,那么获取输出所花费的时间就更多。 Is there any better way of improving the performance.
有没有更好的方法来提高性能。
import groovy.sql.Sql;
import java.sql.ResultSet;
def temp="";
def temp1="";
sql = Sql.newInstance("jdbc:oracle:thin:@localhost:1521:XE","username", "password", "oracle.jdbc.driver.OracleDriver")
sql.eachRow("select empid, empname FROM employee") {
temp1=it.toRowResult().values().join(", ")
if(temp=="") {
temp=temp1;
}else{
temp=temp+"\n"+temp1
}
}
CSVWriter writer = new CSVWriter(new FileWriter("yourfile.csv"), ',');
Boolean includeHeaders = true;
java.sql.ResultSet myResultSet = .... //your resultset logic here
writer.writeAll(myResultSet, includeHeaders);
writer.close();
You can select empid || 您可以选择empid || ', ' ||
','|| empname as NewValue FROM employee in your query, then SQL work for you a little bit
empname作为NewValue FROM员工在您的查询,然后SQL为您工作一点
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