[英]how to connect to a mysql database through eclipse
我有一個在eclipse kepler中運行的應用程序,我的數據庫是AWS RDS MySQL類型。 我已經導入了:mysql-connector-java-gpl-5.1.31-.msi和aws-java-sdk-1.8.5.jar
我想通過Java代碼在RDS實例上執行諸如創建新表或插入更新數據等操作,但是AWS RDS尚未提供相同的API。 所以我一直在嘗試以下方式:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.sql.DriverManager;
import com.amazonaws.AmazonClientException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.rds.AmazonRDSClient;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
public class try_AWS_RDS {
static AmazonRDSClient client;
private static void init() throws Exception {
AWSCredentials credentials = null;
try {
credentials = new ProfileCredentialsProvider("default").getCredentials();
} catch (Exception e) {
throw new AmazonClientException(
"Cannot load the credentials from the credential profiles file.";
}
client = new AmazonRDSClient(credentials);
Region r = Region.getRegion(myRegion);
client.setRegion(r);
}
public static void main(String[] args) throws Exception {
init();
String s = new String();
StringBuffer sb = new StringBuffer();
try
{
Class.forName("com.mysql.jdbc.Driver");
String userName = "myUserName";
String password = "myPassword";
String url = "jdbc:mysql://myDataBaseURL";
Connection c = (Connection) DriverManager.getConnection(url, userName, password);
Statement st = (Statement) c.createStatement();
FileReader fr = new FileReader(new File("C:/Users/.../src/createTable.sql"));
BufferedReader br = new BufferedReader(fr);
while((s = br.readLine()) != null)
{
sb.append(s);
}
br.close();
// here is our splitter ! We use ";" as a delimiter for each request
// then we are sure to have well formed statements
String[] inst = sb.toString().split(";");
for(int i = 0; i<inst.length; i++)
{
// we ensure that there is no spaces before or after the request string
// in order to not execute empty statements
if(!inst[i].trim().equals(""))
{
st.executeUpdate(inst[i]);
System.out.println(">>"+inst[i]);
}
}
} catch (Exception e)
{
e.printStackTrace();
}
}
}
它向我顯示以下錯誤:
com.mysql.jdbc.JDBC4ResultSet@7baf7d com.mysql.jdbc.JDBC4ResultSet@7baf7d java.io.FileNotFoundException:mySQLFile.sql(系統找不到指定的文件),位於java.io.FileInputStream.open(本機方法)com。 mysql.jdbc.JDBC4ResultSet@7baf7d
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileReader.<init>(Unknown Source)
at try1_S3Sample.main(try1_S3Sample.java:96)
請幫忙。 還建議是否還有其他方法可以訪問/更新AWS RDS中的表
你搞砸了一切。 無需導入aws-java-sdk-1.8.5.jar。 這是aws-sdk Java jar。 用於連接到具有MySql數據庫的RDS實例。 您所需要做的就是導入mysql-connector-java-5.1.18-bin.jar並具有在RDS中啟動的數據庫的訪問權限和憑據。 從您的IP(將在其中運行代碼的機器)獲得連接到數據庫的權限,並且此代碼將連接到數據庫,並且您可以基於您的憑據訪問權限執行查詢。
public static void main(String[] args)
{
try{
String host = "jdbc:mysql://rds-ip:3306/rds-database-name";
String uName = "rds-database-username";
String uPass = "rds-database-pasword";
Connection con = DriverManager.getConnection( host, uName, uPass );
Statement stmt = con.createStatement();
String sql = "SELECT * FROM tablename";
ResultSet rs = stmt.executeQuery(sql);
rs.next();
int id_col = rs.getInt("id");
String column1 = rs.getString("column1");
String column2 = rs.getString("column2");
}
catch(SQLException err){
System.out.println(err.getMessage());
}
}
因為錯誤只是FileNotFoundException,所以要澄清它是否只是文件路徑的問題(大寫字母,反斜杠/斜杠...),請首先嘗試將文件放在C:\\ file.sql之類的根目錄中
最有可能找不到C:/Users/.../src/createTable.sql
。
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