两个数据库通过DataTable实现差异传输

两个主要方法

/// <summary>
/// 用途：
/// 用源表和目标表比较，返回差异的数据（目标表为参照物）
///
/// 逻辑：
/// 1、合并两个表
/// 2、循环合并后得到的表，判断是否在目标表中存在，如果不存在，则是新增的，RowState为设置为ADD，如果存在，RowState设置为Modify
/// </summary>
/// <param name="sourceTable">源表</param>
/// <param name="targetTable">目标表</param>
/// <param name="primaryKeyColumn">主键字段</param>
/// <returns>差异数据的DataTable，该DataTable中必须有TableName属性，而且是跟数据库中的表一致的</returns>
private DataTable GetDataTableExceptData(DataTable sourceTable,DataTable targetTable,string tableName,string primaryKeyColumn)
{
DataTable dtExcept = new DataTable(sourceTable.TableName);

try
{
dtExcept = sourceTable.AsEnumerable().Except(targetTable.AsEnumerable(),DataRowComparer.Default).CopyToDataTable();
}
catch (Exception)
{

}

for (int i = 0; i < dtExcept.Rows.Count; i++)
{
object obj = dtExcept.Rows[i][primaryKeyColumn];

targetTable.DefaultView.Sort = primaryKeyColumn;
int count = targetTable.DefaultView.Find(obj);

if (count >= 0)
{
dtExcept.Rows[i].SetModified();
}else{
dtExcept.Rows[i].SetAdded();
}
}

dtExcept.TableName = tableName;
return dtExcept;

}

/// <summary>
/// 用途：
/// 根据DataTable 获取SQL脚本
///
/// 逻辑：
/// 1、先判断是否是自动曾长的，如果是自动增长，先关闭自动增长
/// </summary>
/// <param name="dt">源DataTable与目标DataTable的差异</param>
/// <param name="primaryKeyColumn">主键字段</param>
/// <param name="isIdentity">是否自动增长</param>
/// <returns>SQL脚本</returns>
private StringBuilder GetScriptByDataTable(DataTable dt, string primaryKeyColumn,bool isIdentity)
{
StringBuilder sb = new StringBuilder("");

// 开启自动增长时能进行插入数据，后面对应有关闭
if (isIdentity)
{
sb.AppendLine();
sb.Append("-- ===========================" + dt.TableName + "===============================");
sb.AppendLine();
sb.Append("SET IDENTITY_INSERT " + dt.TableName + " ON");
}

if (dt.TableName == "")
{
DialogResult result = MessageBox.Show("DataTable 的 TableName 未指定");
return null;
}

List<string> list_Column = new List<string>();
foreach (DataColumn item in dt.Columns)
{
list_Column.Add(item.ColumnName);
}

for (int i = 0; i < dt.Rows.Count; i++)
{
StringBuilder sb_Insert = new StringBuilder("");
DataRowState rowState = dt.Rows[i].RowState;
if (rowState == DataRowState.Added)
{
StringBuilder sb_Column = new StringBuilder();
StringBuilder sb_Values = new StringBuilder();

sb_Insert.AppendLine();
sb_Insert.Append("INSERT INTO " + dt.TableName + "(");
for (int m = 0; m < list_Column.Count; m++)
{
sb_Column.Append("," + list_Column[m]);
sb_Values.Append(",'" + dt.Rows[i][list_Column[m]]+"'");
}
sb_Insert.Append(sb_Column.ToString());
sb_Insert.Append(") VALUES(");
sb_Insert.Append(sb_Values.ToString());
sb_Insert.Append(");");
sb_Insert.Replace("INSERT INTO "+ dt.TableName +"(,", "INSERT INTO "+ dt.TableName +"(");
sb_Insert.Replace("VALUES(,", "VALUES(");

sb.Append(sb_Insert.ToString());
}
if (rowState == DataRowState.Modified)
{
StringBuilder sb_Update = new StringBuilder("");
sb_Update.AppendLine();
sb_Update.Append("UPDATE " + dt.TableName + " SET ");
for (int k = 0; k < list_Column.Count; k++)
{
if (list_Column[k] != primaryKeyColumn)
{
sb_Update.Append("," + list_Column[k] + "='" + dt.Rows[i][list_Column[k]] + "'");
}
}
sb_Update.Replace("SET ,", "SET ");
sb_Update.Append(" WHERE " + primaryKeyColumn + " = '" + dt.Rows[i][primaryKeyColumn] + "';");

sb.Append(sb_Update.ToString());
}
if (i > 0 && i % 100 == 0)
{
sb.AppendLine();
sb.Append("GO;");
sb.AppendLine();
}
}

// 关闭自动增长时能进行插入数据，前面对应有开启
if (isIdentity)
{
sb.AppendLine();
sb.Append("SET IDENTITY_INSERT " + dt.TableName + " OFF");
}

return sb;
}

=========================================================================

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace IT_Tools
{
public partial class FormOATransmission : Form
{
/// <summary>
/// 源数据库链接
/// </summary>
private static string ConnectionString_Source = ConfigurationManager.AppSettings["DB_Source"].ToString().Trim(); // 开发机
/// <summary>
/// 目标数据库链接
/// </summary>
private static string ConnectionString_Target = ConfigurationManager.AppSettings["DB_Target"].ToString().Trim(); // 生产机
/// <summary>
/// 需要更新的表集合
/// </summary>
private static ArrayList tableList = new ArrayList();
public FormOATransmission()
{
InitializeComponent();
}

// 两个环境的表对比
private void btnDbCompare_Click(object sender, EventArgs e)
{
string strTableName = ""; // 当前表名称，用于表集合循环
string strPrimaryKeyColumn = "";// 当前表主键字段，用于表集合循环
bool isIdentity=false; // 是否自动曾长，用于表集合循环

DataTable dtSource = null; // 用于存放源表的数据，结构和表名称与目标表一致
DataTable dtTarget = null; // 用于存放目标表的数据，结构和表名称与源表一致
DataTable dt = null;

StringBuilder sb_CurrentTableScript = null;
StringBuilder sb_AllTableScript = new StringBuilder();

DataTable dtTableList = GetTableList(); //获取需要更新的表集合

for (int i = 0; i < dtTableList.Rows.Count; i++)
{
strTableName = dtTableList.Rows[i]["TableName"].ToString();
string sql = "select * from " + strTableName;
dtSource = SqlHelper.ExecuteDataset(ConnectionString_Source, CommandType.Text, sql).Tables[0];
dtTarget = SqlHelper.ExecuteDataset(ConnectionString_Target, CommandType.Text, sql).Tables[0];

strPrimaryKeyColumn = dtTableList.Rows[i]["PrimaryKeyColumn"].ToString();
isIdentity = bool.Parse(dtTableList.Rows[i]["IsIdentity"].ToString());

dt = GetDataTableExceptData(dtSource, dtTarget, strTableName, strPrimaryKeyColumn);
if (dt.Rows.Count > 0)
{
sb_CurrentTableScript = GetScriptByDataTable(dt, strPrimaryKeyColumn, isIdentity);

sb_CurrentTableScript.AppendLine();
sb_AllTableScript.Append(sb_CurrentTableScript);
}
}

rtbSqlContent.Text = sb_AllTableScript.ToString();

}

try
{
dtExcept = sourceTable.AsEnumerable().Except(targetTable.AsEnumerable(),DataRowComparer.Default).CopyToDataTable();
}
catch (Exception)
{

}

for (int i = 0; i < dtExcept.Rows.Count; i++)
{
object obj = dtExcept.Rows[i][primaryKeyColumn];

targetTable.DefaultView.Sort = primaryKeyColumn;
int count = targetTable.DefaultView.Find(obj);

if (count >= 0)
{
dtExcept.Rows[i].SetModified();
}else{
dtExcept.Rows[i].SetAdded();
}
}

dtExcept.TableName = tableName;
return dtExcept;

}

sb.Append(sb_Update.ToString());
}
if (i > 0 && i % 100 == 0)
{
sb.AppendLine();
sb.Append("GO;");
sb.AppendLine();
}
}

// 关闭自动增长时能进行插入数据，前面对应有开启
if (isIdentity)
{
sb.AppendLine();
sb.Append("SET IDENTITY_INSERT " + dt.TableName + " OFF");
}

return sb;
}

/// <summary>
/// 需要同步的表
/// </summary>
/// <returns></returns>
private DataTable GetTableList()
{
DataTable dt = new DataTable();
DataRow row = null;

dt.Columns.AddRange(new DataColumn[]{
new DataColumn("TableName",typeof(string))
,new DataColumn("PrimaryKeyColumn",typeof(string))
,new DataColumn("IsIdentity",typeof(bool))
});

row = dt.NewRow();
row["TableName"] = "TB_A";
row["PrimaryKeyColumn"] = "Id";
row["IsIdentity"] = true;
dt.Rows.Add(row);

row = dt.NewRow();
row["TableName"] = "TB_B";
row["PrimaryKeyColumn"] = "Id";
row["IsIdentity"] = true;
dt.Rows.Add(row);

return dt;
}

// 表的同步
private void btnDbTransmisson_Click(object sender, EventArgs e)
{

}
}
}

posted @ 2017-09-11 16:14 chengeng 阅读(321) 评论(0) 编辑收藏举报

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两个数据库通过DataTable实现差异传输

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