Java 如何将我的sql查询结果集导出为CSV格式?
我正在尝试将我的数据库结果集导出到csv文件,这里我尝试这样做,我正在获取数据,但格式不正确。有人能帮我解决这个问题吗Java 如何将我的sql查询结果集导出为CSV格式?,java,java-8,apache-poi,export-to-csv,opencsv,Java,Java 8,Apache Poi,Export To Csv,Opencsv,我正在尝试将我的数据库结果集导出到csv文件,这里我尝试这样做,我正在获取数据,但格式不正确。有人能帮我解决这个问题吗 import com.opencsv.CSVWriter; public class DbToCSV { @SuppressWarnings("deprecation") public static String RetrieveData(String filename) throws Exception { Strin
import com.opencsv.CSVWriter;
public class DbToCSV {
@SuppressWarnings("deprecation")
public static String RetrieveData(String filename) throws Exception {
String readFile = readFile(filename);
String sql = readFile;
System.out.println(sql);
PreparedStatement statement;
DriverManager.registerDriver(new com.mysql.cj.jdbc.Driver());
String mysqlUrl = "jdbc:mysql://localhost:3306/employee";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "root");
statement = con.prepareStatement(sql);
ResultSet rs = statement.executeQuery();
System.out.println("Process Started");
String file = filename + "/elastic1.csv";
System.out.println(file);
CSVWriter writer = new CSVWriter(new FileWriter(file));
ResultSetMetaData Mdata = rs.getMetaData();
String line1[] = { "id", "id_name", "name", "attribute_name", "values" };
writer.writeNext(line1);
String data[] = new String[5];
while (rs.next()) {
data[0] = new Integer(rs.getInt("id")).toString();
data[1] = new Integer(rs.getInt("id_name")).toString();
data[2] = rs.getString("name");
data[3] = rs.getString("values");
data[4] = rs.getString("data_part");
writer.writeNext(data);
}
writer.flush();
System.out.println("Data entered");
return file;
}
public static void main(String[] args) throws Exception {
RetrieveData("/home/Pictures");
}
}
有一个版本的
writeNext()
采用一个布尔值,该布尔值控制是将引号应用于所有值,还是只应用于需要引用的值。您正在使用的引用了所有值
而不是:
writer.writeNext(data);
使用:
见:
您可以使用writeNext的重载方法,该方法接受布尔值作为参数
void writeNext(String[] nextLine, boolean applyQuotesToAll)
在此过程中,将布尔值设置为false以忽略引号
CSVWriter writer = new CSVWriter(outputfile, ',',
CSVWriter.NO_QUOTE_CHARACTER,
CSVWriter.DEFAULT_ESCAPE_CHARACTER,
CSVWriter.DEFAULT_LINE_END);
[编辑]
还可以使用构造函数禁用引号
CSVWriter writer = new CSVWriter(outputfile, ',',
CSVWriter.NO_QUOTE_CHARACTER,
CSVWriter.DEFAULT_ESCAPE_CHARACTER,
CSVWriter.DEFAULT_LINE_END);
得到相同的结果@vmalletIts not working@ranjan您能更新问题中的代码段吗?如果这不起作用,请尝试使用此构造函数CSVWriter writer=new CSVWriter(outputfile,,,CSVWriter.NO_QUOTE_字符,CSVWriter.DEFAULT_转义_字符,CSVWriter.DEFAULT_行_结束);您可以查看此帖子,