MySQLSyntaxErrorException 异常
MySQLSyntaxErrorException MYSTIQUE
我正在尝试更新我的 jtable（更改值并按回车键），但出现错误。由于尺寸原因，错误未满。我认为其余部分只是用于池连接的 c3p0 工具生成的无关信息。
假设 起初，我认为这可能是 c3p0 的问题，因为为了将它用于准备好的语句，我必须编辑配置 file/change 设置.但是我用传统的get connection from DriverManager的方式发现和它没有关系
另一个假设——是一些数据类型问题。因为我输入 3.00 并且错误显示 ''Flat' = '3.0' where ID = '4'' at line 1
ImportData 方法中的文本测试行未执行。所以这意味着它在执行 SQL 语句时崩溃。在我的数据库中 table 除 ID 和日期外的列都是 float(9,2) 类型，表示总位数 = 9；数字 "after dot" = 2。我确实有 DecimalFormatRenderer class，这可能与此有关。
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''Flat' = '3.0' where ID = '4'' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.Util.getInstance(Util.java:360)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:978)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2141)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2077)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2062)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
at components.TableWithBottomLine$ImportData.<init>(TableWithBottomLine.java:174)
at components.TableWithBottomLine.tableChanged(TableWithBottomLine.java:147)
at javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableCellUpdated(Unknown Source)
at components.TableWithBottomLine$MyTableModel.setValueAt(TableWithBottomLine.java:251)
at javax.swing.JTable.setValueAt(Unknown Source)
at javax.swing.JTable.editingStopped(Unknown Source)
at javax.swing.AbstractCellEditor.fireEditingStopped(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor.stopCellEditing(Unknown Source)
at javax.swing.JTable$GenericEditor.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.actionPerformed(Unknown Source)
at javax.swing.JTextField.fireActionPerformed(Unknown Source)
at javax.swing.JTextField.postActionEvent(Unknown Source)
at javax.swing.JTextField$NotifyAction.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access0(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
代码摘自我的程序：
public void tableChanged(TableModelEvent e) {
int row = e.getFirstRow();
int col = e.getColumn();
model = (MyTableModel) e.getSource();
String colName = model.getColumnName(col);
Object cellValue = model.getValueAt(row, col);
Object cell_Id = model.getValueAt(row, 0);
try {
new ImportData(colName, cellValue, cell_Id);
bottomLabel.setText(textForLabel());
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
} catch (SQLException e1) {
e1.printStackTrace();
}
}
public class ImportData {
public ImportData(String a, Object b, Object c)
throws ClassNotFoundException, SQLException {
Connection connection = null;
PreparedStatement prepStmt = null;
try {
connection = ConnectionManager.getConnection();
String colName = a;
String cellValue = b.toString();
String cell_Id = c.toString();
String updateString = "update finance.fin " + "set ? = ? " + "where ID = ? "+ ";";
prepStmt = connection.prepareStatement(updateString);
prepStmt.setString(1, colName);
prepStmt.setString(2, cellValue);
prepStmt.setString(3, cell_Id);
prepStmt.executeUpdate();
System.out.println("Text test line out of ImportData() method");
} catch (SQLException e) {
e.printStackTrace();
}
finally {
closeAll(null, null, prepStmt, connection);
}
}
}
来自 http://coderanch.com 的 Roel De Nijs
回答了问题。
老实说，我看到您的代码有 3 个问题。首先也是最重要的：我不认为你可以在准备好的语句中做这样的事情 "set ? = ? " 我认为列名不能用占位符替换。尝试使用 "set Flat = ? " 看看它是否有效。如果是这样，您就知道是什么导致了问题。
另外两个是您将参数设置为字符串，而它们不是字符串，但可能是双精度和整数。所以改变你的代码
prepStmt.setString(1, colName);
prepStmt.setString(2, cellValue);
prepStmt.setString(3, cell_Id);
到
// column name not dynamic for test
prepStmt.setDouble(1, cellValue);
prepStmt.setInt(2, cell_Id);
看看这是否有效。您当然应该确保您的变量具有适当的类型。 PS。不建议在变量名中使用下划线，根据命名约定应该是驼峰式。工作代码如下：
public class ImportData {
public ImportData(String a, Object b, Object c)
throws ClassNotFoundException, SQLException {
Connection connection = null;
PreparedStatement prepStmt = null;
try {
connection = ConnectionManager.getConnection();
String colName = a;
// String cellValue = b.toString();
// String cellId = c.toString();
float cellValue = (float) b;
int cellId = (int) c;
String updateString = "update finance.fin " + "set " + colName + "= ? " + "where ID = ? "+ ";";
prepStmt = connection.prepareStatement(updateString);
prepStmt.setFloat(1, cellValue);
prepStmt.setInt(2, cellId);
prepStmt.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
finally {
closeAll(null, null, prepStmt, connection);
}
}
}
我正在尝试更新我的 jtable（更改值并按回车键），但出现错误。由于尺寸原因，错误未满。我认为其余部分只是用于池连接的 c3p0 工具生成的无关信息。
假设 起初，我认为这可能是 c3p0 的问题，因为为了将它用于准备好的语句，我必须编辑配置 file/change 设置.但是我用传统的get connection from DriverManager的方式发现和它没有关系
另一个假设——是一些数据类型问题。因为我输入 3.00 并且错误显示 ''Flat' = '3.0' where ID = '4'' at line 1
ImportData 方法中的文本测试行未执行。所以这意味着它在执行 SQL 语句时崩溃。在我的数据库中 table 除 ID 和日期外的列都是 float(9,2) 类型，表示总位数 = 9；数字 "after dot" = 2。我确实有 DecimalFormatRenderer class，这可能与此有关。
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''Flat' = '3.0' where ID = '4'' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.Util.getInstance(Util.java:360)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:978)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2141)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2077)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2062)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
at components.TableWithBottomLine$ImportData.<init>(TableWithBottomLine.java:174)
at components.TableWithBottomLine.tableChanged(TableWithBottomLine.java:147)
at javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableCellUpdated(Unknown Source)
at components.TableWithBottomLine$MyTableModel.setValueAt(TableWithBottomLine.java:251)
at javax.swing.JTable.setValueAt(Unknown Source)
at javax.swing.JTable.editingStopped(Unknown Source)
at javax.swing.AbstractCellEditor.fireEditingStopped(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor.stopCellEditing(Unknown Source)
at javax.swing.JTable$GenericEditor.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.actionPerformed(Unknown Source)
at javax.swing.JTextField.fireActionPerformed(Unknown Source)
at javax.swing.JTextField.postActionEvent(Unknown Source)
at javax.swing.JTextField$NotifyAction.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access0(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.awt.EventQueue.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
代码摘自我的程序：
public void tableChanged(TableModelEvent e) {
int row = e.getFirstRow();
int col = e.getColumn();
model = (MyTableModel) e.getSource();
String colName = model.getColumnName(col);
Object cellValue = model.getValueAt(row, col);
Object cell_Id = model.getValueAt(row, 0);
try {
new ImportData(colName, cellValue, cell_Id);
bottomLabel.setText(textForLabel());
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
} catch (SQLException e1) {
e1.printStackTrace();
}
}
public class ImportData {
public ImportData(String a, Object b, Object c)
throws ClassNotFoundException, SQLException {
Connection connection = null;
PreparedStatement prepStmt = null;
try {
connection = ConnectionManager.getConnection();
String colName = a;
String cellValue = b.toString();
String cell_Id = c.toString();
String updateString = "update finance.fin " + "set ? = ? " + "where ID = ? "+ ";";
prepStmt = connection.prepareStatement(updateString);
prepStmt.setString(1, colName);
prepStmt.setString(2, cellValue);
prepStmt.setString(3, cell_Id);
prepStmt.executeUpdate();
System.out.println("Text test line out of ImportData() method");
} catch (SQLException e) {
e.printStackTrace();
}
finally {
closeAll(null, null, prepStmt, connection);
}
}
}
来自 http://coderanch.com 的 Roel De Nijs
回答了问题。
老实说，我看到您的代码有 3 个问题。首先也是最重要的：我不认为你可以在准备好的语句中做这样的事情 "set ? = ? " 我认为列名不能用占位符替换。尝试使用 "set Flat = ? " 看看它是否有效。如果是这样，您就知道是什么导致了问题。
另外两个是您将参数设置为字符串，而它们不是字符串，但可能是双精度和整数。所以改变你的代码
prepStmt.setString(1, colName);
prepStmt.setString(2, cellValue);
prepStmt.setString(3, cell_Id);
到
// column name not dynamic for test
prepStmt.setDouble(1, cellValue);
prepStmt.setInt(2, cell_Id);
看看这是否有效。您当然应该确保您的变量具有适当的类型。 PS。不建议在变量名中使用下划线，根据命名约定应该是驼峰式。工作代码如下：
public class ImportData {
public ImportData(String a, Object b, Object c)
throws ClassNotFoundException, SQLException {
Connection connection = null;
PreparedStatement prepStmt = null;
try {
connection = ConnectionManager.getConnection();
String colName = a;
// String cellValue = b.toString();
// String cellId = c.toString();
float cellValue = (float) b;
int cellId = (int) c;
String updateString = "update finance.fin " + "set " + colName + "= ? " + "where ID = ? "+ ";";
prepStmt = connection.prepareStatement(updateString);
prepStmt.setFloat(1, cellValue);
prepStmt.setInt(2, cellId);
prepStmt.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
finally {
closeAll(null, null, prepStmt, connection);
}
}
}