错误：
run:
Loaded the appropriate driver
Created and connected to database localDB2
----- SQLException -----
SQL State: 42X01
Error Code: 30000
Message: Syntax error: Encountered "user" at line 1, column 14.
___ DBTest completed ___
java.sql.SQLSyntaxErrorException: Syntax error: Encountered "user" at line 1, column 14.
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
at localDataBase.start(localDataBase.java:56)
at localDataBase.main(localDataBase.java:17)
Caused by: java.sql.SQLException: Syntax error: Encountered "user" at line 1, column 14.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
... 10 more
Caused by: ERROR 42X01: Syntax error: Encountered "user" at line 1, column 14.
at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
at org.apache.derby.impl.sql.compile.ParserImpl.parseStatement(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown Source)
... 4 more
BUILD SUCCESSFUL (total time: 0 seconds)
码：
import java.sql.*;
import java.util.ArrayList;
import java.util.Properties;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class localDataBase {
private String driver = "org.apache.derby.jdbc.EmbeddedDriver";
private String protocol = "jdbc:derby:";
private String dbName = "localDB2";
private DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
private Date date = new Date();
private Calendar cal = Calendar.getInstance();
public static void main(String[] args) {
new localDataBase().start();
System.out.println("\n___ DBTest completed ___");
}
void start() {
// Load derby driver to start derby engine
try {
Class.forName(driver);
System.out.println("Loaded the appropriate driver");
} catch (ClassNotFoundException cnfe) {
System.err.println("\nUnable to load the JDBC driver " + driver);
System.err.println("Please check your CLASSPATH.");
cnfe.printStackTrace(System.err);
System.exit(1);
}
// establishing a connection to it
// Initializers; declared and set to nulls before the try-block
// to be accessible after the try-block scope
Connection conn = null;
PreparedStatement psInsertUser = null;
PreparedStatement psInsertAdmin = null;
PreparedStatement psInsertBill = null;
PreparedStatement psUpdate = null;
Statement stmt = null;
ResultSet rs = null;
try {
conn = DriverManager.getConnection(protocol + dbName +
";create=true", "test", "test");
System.out.println("Created and connected to database " + dbName);
stmt = conn.createStatement();
// Create User table
stmt.execute("create table user(" +
"id int, " +
"firstName varchar(20), " +
"lastName varchar(20)" +
"userName varchar(20))");
System.out.println("\n___ Created table user ___");
// Create Administrator table
stmt.execute("create table administrator(" +
"id int, " +
"firstName varchar(20), " +
"lastName varchar(20)" +
"userName varchar(20))");
System.out.println("\n___ Created administrator user ___");
// Create Bill table
stmt.execute("create table bill(" +
"yearOfProduction int, " +
"serialNumber varchar(20), " +
"value int, " +
"location varchar(20)" +
"dateAndTimeCounted varchar(20))");
System.out.println("\n___ Created table bill ___");
//PreparedStatement to insert into User table
psInsertUser = conn.prepareStatement
("insert into user values (?, ?, ?, ?)");
// User1 Data
psInsertUser.setInt(1, 1); //insert ID
psInsertUser.setString(2, "Davy "); //insert firstName
psInsertUser.setString(3, "Jones"); //insert lastName
psInsertUser.setString(3, "User1"); //insert userName
psInsertUser.executeUpdate();
System.out.println("\n ____ Inserted: User, Davy Jones");
//PreparedStatement to insert into Administrator table
psInsertAdmin = conn.prepareStatement
("insert into administrator values (?, ?, ?, ?)");
// Admin1 Data
psInsertAdmin.setInt(1, 1); //insert ID
psInsertAdmin.setString(2, "Cutler "); //insert firstName
psInsertAdmin.setString(3, "Beckett"); //insert lastName
psInsertAdmin.setString(3, "Admin1"); //insert userName
psInsertAdmin.executeUpdate();
System.out.println("\n ____ Inserted: Administrator, Cutler Beckett");
//PreparedStatement to insert into Bill table
psInsertBill = conn.prepareStatement
("insert into bill values (?, ?, ?, ?, ?)");
// Bill1 Data
psInsertBill.setInt(1, 2011); //insert year of production
psInsertBill.setString(2, "XY3215616 "); //insert serial number
psInsertBill.setInt(3, 50); //insert value
psInsertBill.setString(4, "Jordan-Irbid-JUST-CairoAmmanBank"); //insert Location
psInsertBill.setString(5, dateFormat.format(cal.getTime()).toString()); //insert date and time
psInsertBill.executeUpdate();
System.out.println("\n ____ Inserted: Bill, XY3215616 50");
//Show user table data
rs = stmt.executeQuery
("SELECT * FROM user order by id");
System.out.printf("\n\n%4s%20s%20s%20s\n",
"Id", "First Name", "Last Name", "User Name");
while (rs.next())
System.out.printf("%4d%20s%20s%20s\n",
rs.getInt("id"),
rs.getString("firstName"),
rs.getString("lastName"),
rs.getString("userName"));
//Show administrator table data
rs = stmt.executeQuery
("SELECT * FROM administrator order by id");
System.out.printf("\n\n%4s%20s%20s%20s\n",
"Id", "First Name", "Last Name", "User Name");
while (rs.next())
System.out.printf("%4d%20s%20s%20s\n",
rs.getInt("id"),
rs.getString("firstName"),
rs.getString("lastName"),
rs.getString("userName"));
//Show user bill data
rs = stmt.executeQuery
("SELECT * FROM bill order by serialNumber");
System.out.printf("\n\n%4s%20s%20s%20s\n",
"year Of Production", "Serial Number", "Value", "Location", "date and time");
while (rs.next())
System.out.printf("%4d%20s%20s%20s%20s\n",
rs.getInt("id"),
rs.getString("firstName"),
rs.getInt("value"),
rs.getString("location"),
rs.getString("dateAndTimeCounted"));
// Commit the transaction. Any changes will be persisted to the database now.
conn.commit();
System.out.println("Committed the transaction");
try {
// the shutdown=true attribute shuts down Derby
DriverManager.getConnection("jdbc:derby:;shutdown=true");
System.out.println("Derby shut down normally");
}
catch (SQLException se) {
System.err.println("Derby did not shut down normally");
}
}
catch (SQLException sqle) {
printSQLException(sqle);
} finally {
// release all open resources to avoid unnecessary memory usage
// Connection
try {
if (conn != null) {
conn.close();
conn = null;
}
} catch (SQLException sqle) {
printSQLException(sqle);
}
}
} // start()
public static void printSQLException(SQLException e) {
System.err.println("\n----- SQLException -----");
System.err.println(" SQL State: " + e.getSQLState());
System.err.println(" Error Code: " + e.getErrorCode());
System.err.println(" Message: " + e.getMessage());
// for stack traces, you may refer to derby.log
e.printStackTrace(System.err);
}
}
我遇到过同样的问题。当我从用户将表名更改为User1时，我的问题得到了解决。 User是一个保留关键字，因此它会在Derby中引发错误，但在MySql工作台上它会正常工作，因为它使用''作为转义序列。
此代码中有许多错误。