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Published 20 hours ago • verified publisher icon marianogappa
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Simple SQL parser meant for querying CSV files

sqlparser - meant for querying csv files

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Usage

package main

import (
	"fmt"
	"log"

	"github.com/marianogappa/sqlparser"
)

func main() {
	query, err := sqlparser.Parse("SELECT a, b, c FROM 'd' WHERE e = '1' AND f > '2'")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%+#v", query)
}

Example: SELECT works

query, err := sqlparser.Parse(`SELECT a FROM 'b'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: []
	Updates: map[]
	Inserts: []
	Fields: [a]
	Aliases: map[]
}

Example: SELECT works with lowercase

query, err := sqlparser.Parse(`select a fRoM 'b'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: []
	Updates: map[]
	Inserts: []
	Fields: [a]
	Aliases: map[]
}

Example: SELECT many fields works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: []
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT with alias works

query, err := sqlparser.Parse(`SELECT a as z, b as y, c FROM 'b'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: []
	Updates: map[]
	Inserts: []
	Fields: [a b c]
	Aliases: map[a:z b:y]
}

Example: SELECT with WHERE with = works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a = ''`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: ,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT with WHERE with < works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a < '1'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Lt,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT with WHERE with <= works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a <= '1'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Lte,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT with WHERE with > works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a > '1'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Gt,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT with WHERE with >= works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a >= '1'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Gte,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT with WHERE with != works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a != '1'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Ne,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT with WHERE with != works (comparing field against another field)

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a != b`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Ne,
            Operand2: b,
            Operand2IsField: true,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: SELECT * works

query, err := sqlparser.Parse(`SELECT * FROM 'b'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: []
	Updates: map[]
	Inserts: []
	Fields: [*]
	Aliases: map[]
}

Example: SELECT a, * works

query, err := sqlparser.Parse(`SELECT a, * FROM 'b'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: []
	Updates: map[]
	Inserts: []
	Fields: [a *]
	Aliases: map[]
}

Example: SELECT with WHERE with two conditions using AND works

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a != '1' AND b = '2'`)

query.Query {
	Type: Select
	TableName: b
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Ne,
            Operand2: 1,
            Operand2IsField: false,
        }
        {
            Operand1: b,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: 2,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: [a c d]
	Aliases: map[]
}

Example: UPDATE works

query, err := sqlparser.Parse(`UPDATE 'a' SET b = 'hello' WHERE a = '1'`)

query.Query {
	Type: Update
	TableName: a
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[b:hello]
	Inserts: []
	Fields: []
	Aliases: map[]
}

Example: UPDATE works with simple quote inside

query, err := sqlparser.Parse(`UPDATE 'a' SET b = 'hello\'world' WHERE a = '1'`)

query.Query {
	Type: Update
	TableName: a
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[b:hello\'world]
	Inserts: []
	Fields: []
	Aliases: map[]
}

Example: UPDATE with multiple SETs works

query, err := sqlparser.Parse(`UPDATE 'a' SET b = 'hello', c = 'bye' WHERE a = '1'`)

query.Query {
	Type: Update
	TableName: a
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[b:hello c:bye]
	Inserts: []
	Fields: []
	Aliases: map[]
}

Example: UPDATE with multiple SETs and multiple conditions works

query, err := sqlparser.Parse(`UPDATE 'a' SET b = 'hello', c = 'bye' WHERE a = '1' AND b = '789'`)

query.Query {
	Type: Update
	TableName: a
	Conditions: [
        {
            Operand1: a,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: 1,
            Operand2IsField: false,
        }
        {
            Operand1: b,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: 789,
            Operand2IsField: false,
        }]
	Updates: map[b:hello c:bye]
	Inserts: []
	Fields: []
	Aliases: map[]
}

Example: DELETE with WHERE works

query, err := sqlparser.Parse(`DELETE FROM 'a' WHERE b = '1'`)

query.Query {
	Type: Delete
	TableName: a
	Conditions: [
        {
            Operand1: b,
            Operand1IsField: true,
            Operator: Eq,
            Operand2: 1,
            Operand2IsField: false,
        }]
	Updates: map[]
	Inserts: []
	Fields: []
	Aliases: map[]
}

Example: INSERT works

query, err := sqlparser.Parse(`INSERT INTO 'a' (b) VALUES ('1')`)

query.Query {
	Type: Insert
	TableName: a
	Conditions: []
	Updates: map[]
	Inserts: [[1]]
	Fields: [b]
	Aliases: map[]
}

Example: INSERT with multiple fields works

query, err := sqlparser.Parse(`INSERT INTO 'a' (b,c,    d) VALUES ('1','2' ,  '3' )`)

query.Query {
	Type: Insert
	TableName: a
	Conditions: []
	Updates: map[]
	Inserts: [[1 2 3]]
	Fields: [b c d]
	Aliases: map[]
}

Example: INSERT with multiple fields and multiple values works

query, err := sqlparser.Parse(`INSERT INTO 'a' (b,c,    d) VALUES ('1','2' ,  '3' ),('4','5' ,'6' )`)

query.Query {
	Type: Insert
	TableName: a
	Conditions: []
	Updates: map[]
	Inserts: [[1 2 3] [4 5 6]]
	Fields: [b c d]
	Aliases: map[]
}

Example: empty query fails

query, err := sqlparser.Parse(``)

query type cannot be empty

Example: SELECT without FROM fails

query, err := sqlparser.Parse(`SELECT`)

table name cannot be empty

Example: SELECT without fields fails

query, err := sqlparser.Parse(`SELECT FROM 'a'`)

at SELECT: expected field to SELECT

Example: SELECT with comma and empty field fails

query, err := sqlparser.Parse(`SELECT b, FROM 'a'`)

at SELECT: expected field to SELECT

Example: SELECT with empty WHERE fails

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE`)

at WHERE: empty WHERE clause

Example: SELECT with WHERE with only operand fails

query, err := sqlparser.Parse(`SELECT a, c, d FROM 'b' WHERE a`)

at WHERE: condition without operator

Example: Empty UPDATE fails

query, err := sqlparser.Parse(`UPDATE`)

table name cannot be empty

Example: Incomplete UPDATE with table name fails

query, err := sqlparser.Parse(`UPDATE 'a'`)

at WHERE: WHERE clause is mandatory for UPDATE & DELETE

Example: Incomplete UPDATE with table name and SET fails

query, err := sqlparser.Parse(`UPDATE 'a' SET`)

at WHERE: WHERE clause is mandatory for UPDATE & DELETE

Example: Incomplete UPDATE with table name, SET with a field but no value and WHERE fails

query, err := sqlparser.Parse(`UPDATE 'a' SET b WHERE`)

at UPDATE: expected '='

Example: Incomplete UPDATE with table name, SET with a field and = but no value and WHERE fails

query, err := sqlparser.Parse(`UPDATE 'a' SET b = WHERE`)

at UPDATE: expected quoted value

Example: Incomplete UPDATE due to no WHERE clause fails

query, err := sqlparser.Parse(`UPDATE 'a' SET b = 'hello' WHERE`)

at WHERE: empty WHERE clause

Example: Incomplete UPDATE due incomplete WHERE clause fails

query, err := sqlparser.Parse(`UPDATE 'a' SET b = 'hello' WHERE a`)

at WHERE: condition without operator

Example: Empty DELETE fails

query, err := sqlparser.Parse(`DELETE FROM`)

table name cannot be empty

Example: DELETE without WHERE fails

query, err := sqlparser.Parse(`DELETE FROM 'a'`)

at WHERE: WHERE clause is mandatory for UPDATE & DELETE

Example: DELETE with empty WHERE fails

query, err := sqlparser.Parse(`DELETE FROM 'a' WHERE`)

at WHERE: empty WHERE clause

Example: DELETE with WHERE with field but no operator fails

query, err := sqlparser.Parse(`DELETE FROM 'a' WHERE b`)

at WHERE: condition without operator

Example: Empty INSERT fails

query, err := sqlparser.Parse(`INSERT INTO`)

table name cannot be empty

Example: INSERT with no rows to insert fails

query, err := sqlparser.Parse(`INSERT INTO 'a'`)

at INSERT INTO: need at least one row to insert

Example: INSERT with incomplete value section fails

query, err := sqlparser.Parse(`INSERT INTO 'a' (`)

at INSERT INTO: need at least one row to insert

Example: INSERT with incomplete value section fails #2

query, err := sqlparser.Parse(`INSERT INTO 'a' (b`)

at INSERT INTO: need at least one row to insert

Example: INSERT with incomplete value section fails #3

query, err := sqlparser.Parse(`INSERT INTO 'a' (b)`)

at INSERT INTO: need at least one row to insert

Example: INSERT with incomplete value section fails #4

query, err := sqlparser.Parse(`INSERT INTO 'a' (b) VALUES`)

at INSERT INTO: need at least one row to insert

Example: INSERT with incomplete row fails

query, err := sqlparser.Parse(`INSERT INTO 'a' (b) VALUES (`)

at INSERT INTO: value count doesn't match field count

Example: INSERT * fails

query, err := sqlparser.Parse(`INSERT INTO 'a' (*) VALUES ('1')`)

at INSERT INTO: expected at least one field to insert

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verified publisher icon marianogappa

Metadata

Simple SQL parser meant for querying CSV files

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