spannerbuilder

spanner sql builder for select statements

supported methods

• Select
  • Syntax: .Select(statement, col1, col2, ...)
  • .Select("field_name") // special case, same as .Select("field_name", "field_name")
  • .Select("DISTINCT field_name", "field_name")
  • .Select("COUNT(*)", "field_name")
  • .Select("field_name1, field_name2", "field_name1", "field_name2")
  • .Select("field_name1").Select("field_name2") // only field_name2 will be selected
• Join
  • .Join("table_name USING(field_name)")
  • .Join("table_name USING(field_name)", "LEFT OUTER")
  • .Join("table_name USING(field_name)", "RIGHT", "OUTER")
  • .Join("table_name USING(field_name)").Join("table_name USING(field_name)")
  • .Join("table_name1@{FORCE_INDEX=index_name} ON table_name1.field_name = table_name2.field_name")
• Index
  • .Index("index_name")
• OrderBy
  • .OrderBy("field_name")
  • .OrderBy("field_name DESC")
• Where
  • .Where("field_name <op> ?", varName)
  • .Where("field_name <op> @field_name", map[string]interface{}{"field_name": verName})
• GroupBy
  • .Select("Sum(field_name1), field_name2", "field_name1", "field_name2"). GroupBy("group_by_expression")
• Having (with GroupBy, Select)
  • .Select("Sum(field_name1), field_name2", "field_name1", "field_name2"). GroupBy("group_by_expression").Having("SUM(field_name1) > 0")
  • .Select("Sum(field_name1), field_name2", "field_name1", "field_name2"). GroupBy("group_by_expression").Having("SUM(field_name1) > ?", 1)
  • .Select("Sum(field_name1), field_name2", "field_name1", "field_name2"). GroupBy("group_by_expression").Having("SUM(field_name1) > @param0", map[string]interface{}{"param0": 1})
  • Having (with GroupBy, Select, Where)
    • .Select("Sum(field_name1), field_name2", "field_name1", "field_name2"). Where("field_name2 == ?", "something"). GroupBy("group_by_expression").Having("SUM(field_name1) > @param0", map[string]interface{}{"param0": 1})
• Limit
  • .Limit(20)
• Offset (with Limit)
  • .Limit(20).Offset(10)
• From
  • .From("table_name")
  • .From("table_name@{FORCE_INDEX=index_name}")
• TableSample
  • .TableSample("RESERVOIR (100 ROWS)"),
  • .TableSample("BERNOULLI (0.1 PERCENT)")
• Statement
  • .Statement("SELECT * FROM users WHERE user_id = ?", "test")
  • .Statement("SELECT * FROM users WHERE user_id = '{0}'", "test")
  • .Statement("SELECT * FROM users WHERE user_id IN ({0}, {1})", 1, 2)
  • .Statement("SELECT * FROM users WHERE user_id = @userId", map[string]interface{}{"userId": "test"})
  • .Statement("SELECT * FROM users WHERE user_id = '{userId}'", map[string]interface{}{"userId": "test"})

SQL Logging

• set DB_DEBUG=1 to output SQL Log