执行以下代码时获取对话错误消息。任何帮助或建议真的很感激。
import java.sql.* ;
import java.util.logging.*;
class check
{
public static void main( String args[] )
{
try
{
// Load the database driver
Class.forName( "com.microsoft.sqlserver.jdbc.SQLServerDriver" ) ;
// Get a connection to the database
Connection conn = DriverManager.getConnection( "jdbc:sqlserver://example.com:1433;user=sa;password=root;databaseName=fetcher") ;
// Print all warnings
for( SQLWarning warn = conn.getWarnings(); warn != null; warn = warn.getNextWarning() )
{
System.out.println( "SQL Warning:" ) ;
System.out.println( "State : " + warn.getSQLState() ) ;
System.out.println( "Message: " + warn.getMessage() ) ;
System.out.println( "Error : " + warn.getErrorCode() ) ;
}
// Prepare a statement
String sql = "select top 5 ID, DN, Type, IPaddress, Date, CheckDate from DATA where (date >= getdate() -2 )";
Statement cs = conn.createStatement();
// Execute the query
ResultSet rs = cs.executeQuery(sql) ;
// Loop through the result set
int i = 0;
while( rs.next() ) {
String row_id = rs.getString("ID");
String row_dn = rs.getString("DN");
int row_type = rs.getInt("Type");
String row_ipaddress = rs.getString("IPaddress");
Date row_date = rs.getDate("Date");
Date row_checkdate = rs.getDate("CheckDate");
iupdateQuery(i, row_id, row_dn, row_type, row_ipaddress,row_date, row_checkdate);
i++;
}
// Close the result set, statement and the connection
rs.close() ;
cs.close() ;
conn.close() ;
}
catch( SQLException se )
{
System.out.println( "SQL Exception:" ) ;
// Loop through the SQL Exceptions
while( se != null )
{
System.out.println( "State : " + se.getSQLState() ) ;
System.out.println( "Message: " + se.getMessage() ) ;
System.out.println( "Error : " + se.getErrorCode() ) ;
se = se.getNextException() ;
}
}
catch( Exception e )
{
System.out.println( e ) ;
}
}
private static void iupdateQuery(int i, String row_id, String row_dn, int row_type, String row_ipaddress, Date row_date, Date row_checkdate) {
String srow_id = row_id;
String srow_dn = row_dn;
int srow_type = row_type;
String srow_ipaddress = row_ipaddress;
Date srow_date = row_date;
Date srow_checkdate = row_checkdate;
String squery = "SET IDENTITY_INSERT dbo.DATA ON";
String insertquery = "insert into DATA(ID, DN, Type, IPaddress, CheckDate) values ('"+ srow_id +"','"+ srow_dn +"','"+ srow_type +"','"+ srow_checkdate +"')";
// debug
String filename = "C:\\test\\output.txt";
try {
// Load the database driver
Class.forName( "com.microsoft.sqlserver.jdbc.SQLServerDriver" ) ;
// Get a connection to the database
Connection dbconn = DriverManager.getConnection( "jdbc:sqlserver://localhost:1433;user=sa;password=root;databaseName=fetcher") ;
Statement es2 = dbconn.createStatement();
es2.executeUpdate(squery);
int data_check = es2.executeUpdate(insertquery);
dbconn.commit();
if (data_check != 0)
{
System.out.println("Inserted: " + insertquery);
}
else
{
String updatequery = "update DATA set DN='"+ srow_dn +"',Type='"+ srow_type +"',IPaddress='"+ srow_ipaddress +"',CheckDate='"+ srow_checkdate +"' where ID='"+ srow_id +"' ";
// es2.executeUpdate(updatequery);
dbconn.commit();
System.out.println("Update: " + updatequery);
}
} catch (Exception e) {
// debug out output this way
System.err.println("Mysql Statement Error: " + insertquery);
e.printStackTrace();
}
}
}
错误:
com.microsoft.sqlserver.jdbc.SQLServerException: Conversion failed when converti
ng date and/or time from character string.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError
(SQLServerException.java:197)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServ
erStatement.java:1493)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.doExecuteStatement(SQ
LServerStatement.java:775)
at com.microsoft.sqlserver.jdbc.SQLServerStatement$StmtExecCmd.doExecute
(SQLServerStatement.java:676)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:4575)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLSe
rverConnection.java:1400)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(SQLSer
verStatement.java:179)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(SQLS
erverStatement.java:154)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeUpdate(SQLServ
erStatement.java:633)
at syncdata.iupdateQuery(syncdata.java:129)
at syncdata.main(syncdata.java:60)
最佳答案
您的代码有点难以阅读(并且从 SQLserver 数据库将错误报告为“Mysql 语句错误”方面很奇怪) - 但基本上这两行都应该更改:
String insertquery = "insert into DATA(ID, DN, Type, IPaddress, CheckDate) values ('"
+ srow_id +"','"+ srow_dn +"','"+ srow_type +"','"+ srow_checkdate +"')";
...
String updatequery = "update DATA set DN='"+ srow_dn +"',Type='"+
srow_type +"',IPaddress='"+ srow_ipaddress +"',CheckDate='"+
srow_checkdate +"' where ID='"+ srow_id +"' ";
您不应该在 SQL 语句中包含这样的值。相反,您应该使用 PreparedStatement
并设置值的参数。有很多好处:
- 它避免 SQL injection attacks
- 它可以避免像您目前遇到的那样的转换错误
- 它使您的代码(SQL)与数据分开
- 它在查询执行计划缓存方面也具有性能优势
请参阅JDBC tutorial了解更多信息。
关于java异常: converting date and/or time from character string,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9760166/