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Description

The ORA-30118 error indicates a syntax error at the end of the input string in Oracle Database. This typically occurs when the SQL statement is incomplete or contains unexpected characters at the end.

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Error Message

ORA-30118: syntax error at ' string ' at the end of input

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Known Causes

3 known causes

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Incomplete SQL Statement

The SQL statement is missing a closing parenthesis, semicolon, or other required terminator. ⚠

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Trailing Characters

Unexpected characters, such as spaces or special symbols, are present after the intended end of the SQL statement. ⚠

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Unclosed String Literal

A string literal within the SQL statement is not properly closed with a matching single quote. ⚠

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Solutions

3 solutions available

1. Identify and Correct Trailing String Literal easy

Locate and remove or properly quote any stray string literal at the end of your SQL statement.

1

Carefully review the SQL statement that is generating the ORA-30118 error. The error message specifically indicates a syntax error at a ' string ' at the end of the input. This means there's likely a string literal (text enclosed in single quotes) that is not properly terminated or is extraneous.

SELECT column1, column2 FROM my_table WHERE condition = 'some_value' 'extra_string'; -- Example of an error

2

If you find a string literal at the very end of the statement that is not part of a valid clause (like a literal in a WHERE clause or a string constant in a SELECT list), remove it. If it's intended to be a string literal, ensure it's correctly enclosed and followed by valid SQL syntax or the end of the statement.

SELECT column1, column2 FROM my_table WHERE condition = 'some_value'; -- Corrected example

3

If the string literal is intended to be part of a larger string, ensure it's properly escaped. For example, if you need a single quote within a string, you must double it.

SELECT 'This string contains a single quote: ''example''' FROM dual; -- Correctly escaped string

2. Check for Unclosed Parentheses or Clauses medium

Ensure all SQL clauses and parentheses are correctly formed and terminated, as a dangling string can sometimes result from this.

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Examine the SQL statement for any unclosed parentheses, especially around subqueries or complex conditions. An unclosed parenthesis can lead the parser to misinterpret subsequent characters, including string literals.

SELECT column1 FROM my_table WHERE (column2 = 'value1' AND column3 = 'value2' -- Missing closing parenthesis

2

Verify that all SQL clauses (like WHERE, GROUP BY, ORDER BY) are correctly terminated and followed by valid syntax. Sometimes, a stray string might appear after an incomplete clause.

SELECT column1 FROM my_table WHERE condition = 'value' GROUP BY -- Incomplete GROUP BY clause

3

Reconstruct the statement piece by piece if necessary, ensuring each part is syntactically correct before moving to the next. This methodical approach helps pinpoint where the parser is getting confused.

SELECT col1, col2
FROM my_table
WHERE (col3 = 'A' AND col4 = 'B')
  AND col5 = 'C'; -- Well-formed example

3. Review Application Code for Dynamic SQL Issues advanced

If the SQL is generated dynamically by an application, inspect the application code for errors in string concatenation or formatting.

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If the SQL statement is constructed dynamically within an application (e.g., in Java, Python, PL/SQL), review the code responsible for building the SQL string. Pay close attention to how string literals are added and concatenated.

String sql = "SELECT * FROM users WHERE username = '" + userName + "';"; -- Potentially unsafe concatenation

2

Ensure that any single quotes within user-provided input or dynamic values are properly escaped before being embedded into the SQL string. This prevents SQL injection and syntax errors.

// In Python, using string formatting and .format() can help, but parameterized queries are best
sql = "SELECT * FROM products WHERE name = '{}'".format(product_name)
# Better: Use parameterized queries to avoid this entirely

3

Use parameterized queries or bind variables whenever possible. This is the most robust way to handle dynamic SQL and prevents both syntax errors and security vulnerabilities. Most database drivers and ORMs support this feature.

import cx_Oracle

connection = cx_Oracle.connect('user/password@host:port/sid')
cursor = connection.cursor()

product_name = "O'Reilly's Book"

# Using bind variables
cursor.execute("SELECT * FROM products WHERE name = :name", name=product_name)
results = cursor.fetchall()

connection.close()

Oracle Syntax Error