/// <summary>
/// Where
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Where(MethodCallExpression expression, SqlPack sqlPack)
{
var key = expression.Method;
if (key.IsGenericMethod)
{
key = key.GetGenericMethodDefinition();
}
//匹配到方法
if (methods.TryGetValue(key.Name, out Action <MethodCallExpression, SqlPack> action))
{
action(expression, sqlPack);
return(sqlPack);
}
else
{
try
{
sqlPack.AddDbParameter(expression.ToObject());
return(sqlPack);
}
catch
{
throw new NotImplementedException("无法解析方法" + expression.Method);
}
}
}
/// <summary>
/// Update
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Update(MemberExpression expression, SqlPack sqlPack)
{
var obj = expression.ToObject();
var properties = obj?.GetType().GetProperties();
foreach (var item in properties)
{
var type = item.DeclaringType.ToString().Contains("AnonymousType") ? sqlPack.DefaultType : item.DeclaringType;
(string columnName, bool isInsert, bool isUpdate) = sqlPack.GetColumnInfo(type, item);
if (isUpdate)
{
var value = item.GetValue(obj, null);
if (value != null || (sqlPack.IsEnableNullValue && value == null))
{
sqlPack += columnName + " = ";
sqlPack.AddDbParameter(value);
sqlPack += ",";
}
}
}
if (sqlPack[sqlPack.Length - 1] == ',')
{
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
return(sqlPack);
}
/// <summary>
/// Insert
/// </summary>
/// <param name="expression"></param>
/// <param name="sqlPack"></param>
/// <returns></returns>
public override SqlPack Insert(MethodCallExpression expression, SqlPack sqlPack)
{
var fields = new List <string>();
var array = expression.ToObject() as object[];
for (var i = 0; i < array.Length; i++)
{
if (sqlPack.DatabaseType != DatabaseType.Oracle)
{
sqlPack.Sql.Append("(");
}
if (i > 0 && sqlPack.DatabaseType == DatabaseType.Oracle)
{
sqlPack.Sql.Append(" UNION ALL SELECT ");
}
var properties = array[i]?.GetType().GetProperties();
foreach (var p in properties)
{
var type = p.DeclaringType.ToString().Contains("AnonymousType") ? sqlPack.DefaultType : p.DeclaringType;
(string columnName, bool isInsert, bool isUpdate) = sqlPack.GetColumnInfo(type, p);
if (isInsert)
{
var value = p.GetValue(array[i], null);
if (value != null || (sqlPack.IsEnableNullValue && value == null))
{
sqlPack.AddDbParameter(value);
if (!fields.Contains(columnName))
{
fields.Add(columnName);
}
sqlPack += ",";
}
}
}
if (sqlPack[sqlPack.Length - 1] == ',')
{
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
if (sqlPack.DatabaseType != DatabaseType.Oracle)
{
sqlPack.Sql.Append("),");
}
else
{
sqlPack.Sql.Append(" FROM DUAL");
}
}
}
if (sqlPack.Sql[sqlPack.Sql.Length - 1] == ',')
{
sqlPack.Sql.Remove(sqlPack.Sql.Length - 1, 1);
}
sqlPack.Sql = new StringBuilder(string.Format(sqlPack.ToString(), string.Join(",", fields).TrimEnd(',')));
return(sqlPack);
}
/// <summary>
/// Join
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Join(ConstantExpression expression, SqlPack sqlPack)
{
//表达式左侧为bool类型常量
if (expression.NodeType == ExpressionType.Constant && expression.Value is bool b)
{
var sql = sqlPack.ToString().ToUpper().Trim();
if (!b && (sql.EndsWith("AND") || sql.EndsWith("OR")))
{
sqlPack += " 1 = 0 ";
}
}
else
{
sqlPack.AddDbParameter(expression.Value);
}
return(sqlPack);
}
/// <summary>
/// Insert
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Insert(NewExpression expression, SqlPack sqlPack)
{
if (sqlPack.DatabaseType != DatabaseType.Oracle)
{
sqlPack.Sql.Append("(");
}
var fields = new List <string>();
for (int i = 0; i < expression.Members?.Count; i++)
{
var m = expression.Members[i];
var t = m.DeclaringType.ToString().Contains("AnonymousType") ? sqlPack.DefaultType : m.DeclaringType;
(string columnName, bool isInsert, bool isUpdate) = sqlPack.GetColumnInfo(t, m);
if (isInsert)
{
var value = expression.Arguments[i]?.ToObject();
if (value != null || (sqlPack.IsEnableNullValue && value == null))
{
sqlPack.AddDbParameter(value);
if (!fields.Contains(columnName))
{
fields.Add(columnName);
}
sqlPack += ",";
}
}
}
if (sqlPack[sqlPack.Length - 1] == ',')
{
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
if (sqlPack.DatabaseType != DatabaseType.Oracle)
{
sqlPack.Sql.Append(")");
}
else
{
sqlPack.Sql.Append(" FROM DUAL");
}
}
sqlPack.Sql = new StringBuilder(string.Format(sqlPack.ToString(), string.Join(",", fields).TrimEnd(',')));
return(sqlPack);
}
/// <summary>
/// Update
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Update(MemberInitExpression expression, SqlPack sqlPack)
{
foreach (MemberAssignment m in expression.Bindings)
{
var type = m.Member.DeclaringType.ToString().Contains("AnonymousType") ? sqlPack.DefaultType : m.Member.DeclaringType;
(string columnName, bool isInsert, bool isUpdate) = sqlPack.GetColumnInfo(type, m.Member);
if (isUpdate)
{
var value = m.Expression.ToObject();
if (value != null || (sqlPack.IsEnableNullValue && value == null))
{
sqlPack += columnName + " = ";
sqlPack.AddDbParameter(value);
sqlPack += ",";
}
}
}
if (sqlPack[sqlPack.Length - 1] == ',')
{
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
return(sqlPack);
}
/// <summary>
/// Where
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Where(MemberExpression expression, SqlPack sqlPack)
{
//此处判断expression的Member是否是可空值类型
if (expression.Expression?.NodeType == ExpressionType.MemberAccess &&
expression.Member.DeclaringType.IsNullable())
{
expression = expression.Expression as MemberExpression;
}
if (expression != null)
{
if (expression.Expression?.NodeType == ExpressionType.Parameter)
{
var type = expression.Expression.Type != expression.Member.DeclaringType ?
expression.Expression.Type :
expression.Member.DeclaringType;
var tableName = sqlPack.GetTableName(type);
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
if (!tableAlias.IsNullOrEmpty())
{
tableAlias += ".";
}
sqlPack += tableAlias + sqlPack.GetColumnInfo(expression.Member.DeclaringType, expression.Member).columnName;
//字段是bool类型
if (expression.NodeType == ExpressionType.MemberAccess &&
expression.Type.GetCoreType() == typeof(bool))
{
sqlPack += " = 1";
}
}
else
{
sqlPack.AddDbParameter(expression.ToObject());
}
}
return(sqlPack);
}
/// <summary>
/// Update
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Update(NewExpression expression, SqlPack sqlPack)
{
for (int i = 0; i < expression.Members.Count; i++)
{
var m = expression.Members[i];
var t = m.DeclaringType.ToString().Contains("AnonymousType") ? sqlPack.DefaultType : m.DeclaringType;
(string columnName, bool isInsert, bool isUpdate) = sqlPack.GetColumnInfo(t, m);
if (isUpdate)
{
var value = expression.Arguments[i]?.ToObject();
if (value != null || (sqlPack.IsEnableNullValue && value == null))
{
sqlPack += columnName + " = ";
sqlPack.AddDbParameter(value);
sqlPack += ",";
}
}
}
if (sqlPack[sqlPack.Length - 1] == ',')
{
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
return(sqlPack);
}
/// <summary>
/// In
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack In(ConstantExpression expression, SqlPack sqlPack)
{
sqlPack.AddDbParameter(expression.Value);
return(sqlPack);
}