本文整理了Java中java.sql.ResultSet.beforeFirst方法的一些代码示例，展示了ResultSet.beforeFirst的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ResultSet.beforeFirst方法的具体详情如下：
包路径：java.sql.ResultSet
类名称：ResultSet
方法名：beforeFirst

ResultSet.beforeFirst介绍

[英]Moves the cursor to the start of the ResultSet, before the first row.
[中]将光标移动到结果集的开头，在第一行之前。

代码示例

代码示例来源：origin: querydsl/querydsl

@Override
public void beforeFirst() throws SQLException {
  rs.beforeFirst();
}

代码示例来源：origin: codingapi/tx-lcn

@Override
public void beforeFirst() throws SQLException {
 delegate.beforeFirst();
}

代码示例来源：origin: spring-projects/spring-framework

/**
 * @see java.sql.ResultSet#beforeFirst()
 */
@Override
public void beforeFirst() throws InvalidResultSetAccessException {
  try {
    this.resultSet.beforeFirst();
  }
  catch (SQLException se) {
    throw new InvalidResultSetAccessException(se);
  }
}

代码示例来源：origin: alibaba/druid

@Override
public void beforeFirst() throws SQLException {
  try {
    rs.beforeFirst();
  } catch (Throwable t) {
    throw checkException(t);
  }
}

代码示例来源：origin: stackoverflow.com

ResultSet rs = ps.executeQuery();
int rowcount = 0;
if (rs.last()) {
 rowcount = rs.getRow();
 rs.beforeFirst(); // not rs.first() because the rs.next() below will move on, missing the first element
}
while (rs.next()) {
 // do your standard per row stuff
}

代码示例来源：origin: apache/ignite

@Override public void run() throws Exception {
    rs.beforeFirst();
  }
});

代码示例来源：origin: debezium/debezium

private int[] findMaxLength(ResultSet resultSet) throws SQLException {
  ResultSetMetaData rsmd = resultSet.getMetaData();
  int columnCount = rsmd.getColumnCount();
  int[] columnSizes = new int[columnCount + 1];
  for (int i = 1; i <= columnCount; i++) {
    columnSizes[i] = Math.max(columnSizes[i], rsmd.getColumnLabel(i).length());
  }
  while (resultSet.next()) {
    for (int i = 1; i <= columnCount; i++) {
      String value = resultSet.getString(i);
      if (value != null) columnSizes[i] = Math.max(columnSizes[i], value.length());
    }
  }
  resultSet.beforeFirst();
  return columnSizes;
}

代码示例来源：origin: stackoverflow.com

private int getRowCount(ResultSet resultSet) {
  if (resultSet == null) {
    return 0;
  }
  try {
    resultSet.last();
    return resultSet.getRow();
  } catch (SQLException exp) {
    exp.printStackTrace();
  } finally {
    try {
      resultSet.beforeFirst();
    } catch (SQLException exp) {
      exp.printStackTrace();
    }
  }
  return 0;
}

代码示例来源：origin: apache/hive

/**
 * Try to obtain the current size of the specified {@link ResultSet} by jumping to the last row
 * and getting the row number.
 *
 * @param rs
 *          the {@link ResultSet} to get the size for
 * @return the size, or -1 if it could not be obtained
 */
int getSize(ResultSet rs) {
 try {
  if (rs.getType() == rs.TYPE_FORWARD_ONLY) {
   return -1;
  }
  rs.last();
  int total = rs.getRow();
  rs.beforeFirst();
  return total;
 } catch (SQLException sqle) {
  return -1;
 }
 // JDBC 1 driver error
 catch (AbstractMethodError ame) {
  return -1;
 }
}

代码示例来源：origin: hibernate/hibernate-orm

@Override
public void beforeFirst() {
  try {
    getResultSet().beforeFirst();
  }
  catch (SQLException sqle) {
    throw convert( sqle, "exception calling beforeFirst()" );
  }
}

代码示例来源：origin: alibaba/druid

@Override
public void resultSet_beforeFirst(ResultSetProxy rs) throws SQLException {
  if (this.pos < filterSize) {
    nextFilter()
        .resultSet_beforeFirst(this, rs);
    return;
  }
  rs.getResultSetRaw()
      .beforeFirst();
}

代码示例来源：origin: hibernate/hibernate-orm

@Override
public void beforeFirst() {
  try {
    getResultSet().beforeFirst();
  }
  catch (SQLException e) {
    throw getSession().getFactory().getSQLExceptionHelper().convert(
        e,
        "exception calling beforeFirst()"
    );
  }
  currentRow = null;
  currentPosition = 0;
}

代码示例来源：origin: com.h2database/h2

@Override
public String getString() {
  try {
    StatementBuilder buff = new StatementBuilder("(");
    result.beforeFirst();
    ResultSetMetaData meta = result.getMetaData();
    int columnCount = meta.getColumnCount();
    for (int i = 0; result.next(); i++) {
      if (i > 0) {
        buff.append(", ");
      }
      buff.append('(');
      buff.resetCount();
      for (int j = 0; j < columnCount; j++) {
        buff.appendExceptFirst(", ");
        int t = DataType.getValueTypeFromResultSet(meta, j + 1);
        Value v = DataType.readValue(null, result, j + 1, t);
        buff.append(v.getString());
      }
      buff.append(')');
    }
    result.beforeFirst();
    return buff.append(')').toString();
  } catch (SQLException e) {
    throw DbException.convert(e);
  }
}

代码示例来源：origin: lealone/Lealone

@Override
public String getString() {
  try {
    StatementBuilder buff = new StatementBuilder("(");
    result.beforeFirst();
    ResultSetMetaData meta = result.getMetaData();
    int columnCount = meta.getColumnCount();
    for (int i = 0; result.next(); i++) {
      if (i > 0) {
        buff.append(", ");
      }
      buff.append('(');
      buff.resetCount();
      for (int j = 0; j < columnCount; j++) {
        buff.appendExceptFirst(", ");
        int t = DataType.convertSQLTypeToValueType(meta.getColumnType(j + 1));
        Value v = DataType.readValue(null, result, j + 1, t);
        buff.append(v.getString());
      }
      buff.append(')');
    }
    result.beforeFirst();
    return buff.append(')').toString();
  } catch (SQLException e) {
    throw DbException.convert(e);
  }
}

代码示例来源：origin: lealone/Lealone

try {
  ResultSet rs = ((ValueResultSet) v).getResultSet();
  rs.beforeFirst();
  ResultSetMetaData meta = rs.getMetaData();
  int columnCount = meta.getColumnCount();
  rs.beforeFirst();
} catch (SQLException e) {
  throw DbException.convert(e);

代码示例来源：origin: apache/ignite

sfuFut0.get();
rs.beforeFirst();

代码示例来源：origin: com.h2database/h2

try {
  ResultSet rs = ((ValueResultSet) v).getResultSet();
  rs.beforeFirst();
  ResultSetMetaData meta = rs.getMetaData();
  int columnCount = meta.getColumnCount();
  rs.beforeFirst();
} catch (SQLException e) {
  throw DbException.convert(e);

代码示例来源：origin: lealone/Lealone

try {
  ResultSet rs = ((ValueResultSet) v).getResultSet();
  rs.beforeFirst();
  ResultSetMetaData meta = rs.getMetaData();
  int columnCount = meta.getColumnCount();
  rs.beforeFirst();
} catch (SQLException e) {
  throw DbException.convertToIOException(e);

代码示例来源：origin: apache/ignite

rs.beforeFirst();

代码示例来源：origin: com.alibaba/druid

@Override
public void resultSet_beforeFirst(ResultSetProxy rs) throws SQLException {
  if (this.pos < filterSize) {
    nextFilter()
        .resultSet_beforeFirst(this, rs);
    return;
  }
  rs.getResultSetRaw()
      .beforeFirst();
}