MysqlIO会对数据库返回的resultPacket进行checkError
private void checkErrorPacket(Buffer resultPacket) throws SQLException {
int statusCode = resultPacket.readByte();
// Error handling
if (statusCode == (byte) 0xff) {
String serverErrorMessage;
int errno = 2000;
if (this.protocolVersion > 9) {
errno = resultPacket.readInt();
String xOpen = null;
serverErrorMessage = resultPacket.readString(this.connection.getErrorMessageEncoding(), getExceptionInterceptor());
if (serverErrorMessage.charAt(0) == '#') {
// we have an SQLState
if (serverErrorMessage.length() > 6) {
xOpen = serverErrorMessage.substring(1, 6);
serverErrorMessage = serverErrorMessage.substring(6);
if (xOpen.equals("HY000")) {
xOpen = SQLError.mysqlToSqlState(errno, this.connection.getUseSqlStateCodes());
}
} else {
xOpen = SQLError.mysqlToSqlState(errno, this.connection.getUseSqlStateCodes());
}
} else {
xOpen = SQLError.mysqlToSqlState(errno, this.connection.getUseSqlStateCodes());
}
clearInputStream();
StringBuilder errorBuf = new StringBuilder();
String xOpenErrorMessage = SQLError.get(xOpen);
if (!this.connection.getUseOnlyServerErrorMessages()) {
if (xOpenErrorMessage != null) {
errorBuf.append(xOpenErrorMessage);
errorBuf.append(Messages.getString("MysqlIO.68"));
}
}
errorBuf.append(serverErrorMessage);
if (!this.connection.getUseOnlyServerErrorMessages()) {
if (xOpenErrorMessage != null) {
errorBuf.append("\"");
}
}
appendDeadlockStatusInformation(xOpen, errorBuf);
if (xOpen != null && xOpen.startsWith("22")) {
throw new MysqlDataTruncation(errorBuf.toString(), 0, true, false, 0, 0, errno);
}
throw SQLError.createSQLException(errorBuf.toString(), xOpen, errno, false, getExceptionInterceptor(), this.connection);
}
serverErrorMessage = resultPacket.readString(this.connection.getErrorMessageEncoding(), getExceptionInterceptor());
clearInputStream();
if (serverErrorMessage.indexOf(Messages.getString("MysqlIO.70")) != -1) {
throw SQLError.createSQLException(SQLError.get(SQLError.SQL_STATE_COLUMN_NOT_FOUND) + ", " + serverErrorMessage,
SQLError.SQL_STATE_COLUMN_NOT_FOUND, -1, false, getExceptionInterceptor(), this.connection);
}
StringBuilder errorBuf = new StringBuilder(Messages.getString("MysqlIO.72"));
errorBuf.append(serverErrorMessage);
errorBuf.append("\"");
throw SQLError.createSQLException(SQLError.get(SQLError.SQL_STATE_GENERAL_ERROR) + ", " + errorBuf.toString(), SQLError.SQL_STATE_GENERAL_ERROR, -1,
false, getExceptionInterceptor(), this.connection);
}
}