Created
February 10, 2019 21:13
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A SQL Extension to read JSON generated from SQL Server in C#
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public static class SQLExtensions | |
{ | |
/// <summary> | |
/// Microsoft doesn't handle JSON well, it wants to use XML methods which then retrieve | |
/// the JSON. Sometimes the JSON has characters in it which | |
/// </summary> | |
public static SqlJSONReader ExecuteJsonReader(this SqlCommand cmd) | |
{ | |
var rdr = cmd.ExecuteReader(); | |
return new SqlJSONReader(rdr); | |
} | |
public static async Task<SqlJSONReader> ExecuteJsonReaderAsync(this SqlCommand cmd) | |
{ | |
var rdr = await cmd.ExecuteReaderAsync(); | |
return new SqlJSONReader(rdr); | |
} | |
public class SqlJSONReader : System.IO.TextReader | |
{ | |
private SqlDataReader SqlReader { get; set; } | |
private string CurrentLine { get; set; } | |
private int CurrentPostion { get; set; } | |
public SqlJSONReader(SqlDataReader rdr) | |
{ | |
CurrentLine = ""; | |
CurrentPostion = 0; | |
this.SqlReader = rdr; | |
} | |
public override int Peek() | |
{ | |
return GetChar(false); | |
} | |
public async Task<int> PeekAsync() | |
{ | |
return await GetCharAsync(false); | |
} | |
public override int Read() | |
{ | |
return GetChar(true); | |
} | |
public async Task<int> ReadAsync() | |
{ | |
return await GetCharAsync(true); | |
} | |
public int GetChar(bool Advance) | |
{ | |
while (CurrentLine.Length == CurrentPostion) | |
{ | |
if (!SqlReader.Read()) | |
{ | |
return -1; | |
} | |
CurrentLine = SqlReader.GetString(0); | |
CurrentPostion = 0; | |
} | |
var rv = CurrentLine[CurrentPostion]; | |
if (Advance) | |
CurrentPostion += 1; | |
return rv; | |
} | |
public async Task<int> GetCharAsync(bool Advance) | |
{ | |
while (CurrentLine.Length == CurrentPostion) | |
{ | |
if ((await SqlReader.ReadAsync()) == false) | |
{ | |
return -1; | |
} | |
CurrentLine = SqlReader.GetString(0); | |
CurrentPostion = 0; | |
} | |
var rv = CurrentLine[CurrentPostion]; | |
if (Advance) | |
CurrentPostion += 1; | |
return rv; | |
} | |
public string ReadAll() | |
{ | |
var sbResult = new StringBuilder(); | |
if (SqlReader.HasRows) | |
{ | |
while (SqlReader.Read()) | |
sbResult.Append(SqlReader.GetString(0)); | |
} | |
else | |
return string.Empty; | |
// Clean up any JSON escapes before returning | |
return JsonConvert.DeserializeObject(sbResult.ToString()).ToString(); | |
} | |
public async Task<string> ReadAllAsync() | |
{ | |
var sbResult = new StringBuilder(); | |
if (SqlReader.HasRows) | |
{ | |
while (await SqlReader.ReadAsync()) | |
sbResult.Append(SqlReader.GetString(0)); | |
} | |
else | |
return string.Empty; | |
// Clean up any JSON escapes before returning | |
return JsonConvert.DeserializeObject(sbResult.ToString()).ToString(); | |
} | |
public override void Close() | |
{ | |
SqlReader.Close(); | |
} | |
} | |
} |
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