/// <summary>
/// 判读记录是否已经存在
/// </summary>
public bool IsExist(DataRow dataRow)
{
IDbCommand command = this.driver.CreateDbCommand();
DataTable dataTable = dataRow.Table;
StringBuilder sql = new StringBuilder();
sql.AppendFormat("SELECT COUNT(*) FROM {0}", dataTable.TableName);
for (int i = 0; i < dataTable.PrimaryKey.Length; i++)
{
bool isFirst = (i == 0);
DataColumn dataColumn = dataTable.PrimaryKey[i];
IDataParameter parameter = this.driver.CreateDbParameter(dataColumn.ColumnName);
command.Parameters.Add(parameter);
string sqlParameterName = this.driver.ToSQLParameterName(dataColumn.ColumnName);
sql
.Append(isFirst ? " WHERE " : " AND ")
.AppendFormat("{0}={1}", dataColumn.ColumnName, sqlParameterName);
}
command.CommandText = sql.ToString();
command.CommandType = CommandType.Text;
SqlUtil.AssignParameterValues(command.Parameters, dataRow);
object returnValue = this.ExecuteScalar(command);
return(Convert.ToInt32(returnValue) > 0);
}
/// <summary>
/// 删除记录
/// </summary>
public void Delete(DataRow dataRow)
{
IDbCommand command = this.driver.CreateDbCommand();
DataTable dataTable = dataRow.Table;
StringBuilder sql = new StringBuilder();
sql.AppendFormat("DELETE FROM {0}", dataTable.TableName);
for (int i = 0; i < dataTable.PrimaryKey.Length; i++)
{
bool isFirst = (i == 0);
DataColumn dataColumn = dataTable.PrimaryKey[i];
IDataParameter parameter = this.driver.CreateDbParameter(dataColumn.ColumnName);
command.Parameters.Add(parameter);
string sqlParameterName = this.driver.ToSQLParameterName(dataColumn.ColumnName);
sql.Append(isFirst ? " WHERE " : " AND ")
.AppendFormat("{0}={1}", dataColumn.ColumnName, sqlParameterName);
}
command.CommandText = sql.ToString();
command.CommandType = CommandType.Text;
SqlUtil.AssignParameterValues(command.Parameters, dataRow);
this.ExecuteNonQuery(command);
}
/// <summary>
/// 根据存储过程名称与 DataRow 对象执行数据库操作命令
/// </summary>
/// <param name="procedureName">存储过程名称</param>
/// <param name="dataRow">DataRow 对象</param>
public void ExecuteDataRow(string procedureName, DataRow dataRow)
{
IDbCommand command = this.CreateProcedureCommand(procedureName);
// 从DataRow对象中取参数值赋给数据库操作命令参数
SqlUtil.AssignParameterValues(command.Parameters, dataRow);
this.ExecuteNonQuery(command);
// 从数据库操作命令参数取返回值赋给DataRow对象
SqlUtil.AssignDataRowValues(dataRow, command.Parameters);
}
/// <summary>
/// 添加记录
/// </summary>
public virtual void Insert(DataRow dataRow)
{
IDbCommand command = this.driver.CreateDbCommand();
DataTable dataTable = dataRow.Table;
StringBuilder sql = new StringBuilder();
sql.AppendFormat("INSERT INTO {0} ", dataTable.TableName);
StringBuilder columnsExpression = new StringBuilder();
StringBuilder valuesExpression = new StringBuilder();
for (int i = 0; i < dataTable.Columns.Count; i++)
{
bool isLast = (i == dataTable.Columns.Count - 1);
DataColumn dataColumn = dataTable.Columns[i];
// 不处理自增字段
if (dataColumn.AutoIncrement)
{
continue;
}
IDataParameter parameter = this.driver.CreateDbParameter(dataColumn.ColumnName);
command.Parameters.Add(parameter);
columnsExpression
.Append(isLast ? string.Empty : ",")
.Append(dataColumn.ColumnName);
string sqlParameterName = this.driver.ToSQLParameterName(dataColumn.ColumnName);
valuesExpression
.Append(isLast ? string.Empty : ",")
.Append(sqlParameterName);
}
sql.AppendFormat("({0})", columnsExpression.ToString())
.AppendFormat(" VALUES({0})", valuesExpression.ToString());
command.CommandText = sql.ToString();
command.CommandType = CommandType.Text;
SqlUtil.AssignParameterValues(command.Parameters, dataRow);
this.ExecuteNonQuery(command);
}
/// <summary>
/// 修改记录
/// </summary>
public void Update(DataRow dataRow)
{
IDbCommand command = this.driver.CreateDbCommand();
DataTable dataTable = dataRow.Table;
StringBuilder sql = new StringBuilder();
sql.AppendFormat("UPDATE {0} SET ", dataTable.TableName);
StringBuilder where = new StringBuilder();
where.Append(" WHERE 1=1");
for (int i = 0; i < dataTable.Columns.Count; i++)
{
bool isLast = (i == dataTable.Columns.Count - 1);
DataColumn dataColumn = dataTable.Columns[i];
// 不处理非主键自增字段
if (dataColumn.AutoIncrement &&
Array.IndexOf(dataTable.PrimaryKey, dataColumn) == -1)
{
continue;
}
IDataParameter parameter = this.driver.CreateDbParameter(dataColumn.ColumnName);
command.Parameters.Add(parameter);
string sqlParameterName = this.driver.ToSQLParameterName(dataColumn.ColumnName);
sql.Append(isLast ? string.Empty : ",")
.AppendFormat("{0}={1}", dataColumn.ColumnName, sqlParameterName);
//主键作为条件
if (Array.IndexOf(dataTable.PrimaryKey, dataColumn) != -1)
{
where.AppendFormat(" AND {0}={1}", dataColumn.ColumnName, sqlParameterName);
}
}
command.CommandText = sql.Append(where).ToString();
command.CommandType = CommandType.Text;
SqlUtil.AssignParameterValues(command.Parameters, dataRow);
this.ExecuteNonQuery(command);
}
